Battery pack shell, battery pack and vehicle

Abstract

The utility model provides a battery pack shell, a battery pack and a vehicle, and relates to the technical field of battery packs, the battery pack shell comprises a shell assembly and a breaking-through piece, and a liquid injection hole is formed in the shell assembly. The breaking-through piece comprises a frame and a fragment set connected to the frame, and the frame is connected to the shell assembly so as to block the liquid injection hole. A tearing part is arranged on the fragment group, and a bending part is arranged at the joint of the fragment group and the frame. And at least part of the fragment group is configured to be broken along the tearing part and bent inwards along the bending part under the impact action of external cooling liquid so as to open the liquid injection hole. According to the battery pack shell disclosed by the embodiment of the utility model, the fragment group on the breaking-through piece can be torn and bent along the set path, so that secondary damage to the battery cell caused by the fact that fragments enter the battery pack is avoided or relieved, and the loss is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a battery pack housing, a battery pack, and a vehicle. Background Art

[0002] As a power source, battery packs are widely used in new energy vehicles or other electrical equipment.

[0003] A battery pack is typically made up of multiple cells connected in series and parallel, encapsulated within a casing. Since the cells are located inside the casing, when thermal runaway occurs, coolant or water is typically sprayed into the battery pack to reduce the internal cell temperature. Related technologies employ a water inlet hole in the battery pack casing, sealed with a metal rupture disc. This allows coolant to penetrate the metal rupture disc and enter the battery pack during thermal runaway, effectively cooling the battery and extinguishing the fire.

[0004] However, after the metal bursting disc is completely broken, it enters the shell of the battery pack, which can easily cause a short circuit between the positive and negative poles of the battery cell, increasing the risk of secondary damage to the battery cell. Utility Model Content

[0005] Based on this, the present application provides a battery pack housing, a battery pack and a vehicle, which can reduce secondary damage to the battery cells in the battery pack to reduce losses.

[0006] In a first aspect, the present application provides a battery pack housing, comprising:

[0007] A shell assembly, wherein a liquid injection hole is provided on the shell assembly;

[0008] The rupture piece includes a frame and a fragment group connected to the frame, and the frame is connected to the shell assembly to block the injection hole;

[0009] The fragment group is provided with a tearing portion, and the connection between the fragment group and the frame is provided with a bending portion;

[0010] At least part of the fragment group is configured to be broken along the tearing portion and bent inward along the bending portion under the impact of external coolant to open the liquid injection hole.

[0011] In a possible implementation, the fragment group includes a first fragment and a plurality of second fragments, wherein the plurality of second fragments are connected to the circumference of the first fragment;

[0012] The tearing portion includes a first tearing portion and a second tearing portion, wherein the first tearing portion is provided at the connection between the first fragment and each second fragment, and the second tearing portion is provided at the connection between adjacent second fragments; the first fragment is configured to break along the first tearing portion under the impact of external coolant;

[0013] Each second fragment is connected to the frame, and the bending portion is provided at the connection between the frame and each second fragment; each second fragment is configured to be broken along the second tearing portion and bent inward along the bending portion under the impact of external coolant.

[0014] In a possible implementation, the first tear portion is a first tear groove, the second tear portion is a second tear groove, and the depth of the second tear groove is smaller than the depth of the first tear groove.

[0015] In a possible implementation, the depth of the second tear groove gradually decreases in a direction approaching the bending portion.

[0016] In a possible implementation, the bending portion is a bending groove, one end of the second tearing groove is connected to the bending groove, and the other end of the second tearing groove is connected to the first tearing groove.

[0017] In a possible implementation, the housing assembly includes a lower housing and an upper housing covering the lower housing, and a liquid injection hole is provided on at least one side of the upper housing.

[0018] In one possible implementation, the housing assembly further includes a blocking plate, and a window is provided on at least one side of the lower housing;

[0019] The blocking plate is detachably connected to the lower shell to block the window.

[0020] In a second aspect, the present application further provides a battery pack, comprising a battery cell module and any one of the battery pack shells provided in the first aspect, wherein the battery cell module is disposed in the battery pack shell.

[0021] In one possible implementation, the battery pack further includes at least one tray, the tray being provided with a receiving cavity, the tray being disposed within the battery pack housing, and the battery cell module being disposed within the receiving cavity;

[0022] A flow groove is provided on at least one upper side of the tray, and the flow groove is higher than or equal to the upper surface of the battery cell module.

[0023] In a third aspect, the present application also provides a vehicle, comprising a vehicle body, wherein the vehicle body is provided with any one of the battery packs provided in the second aspect.

[0024] The present application provides a battery pack shell, a battery pack and a vehicle, wherein the battery pack shell includes a shell assembly and a rupture piece, and an injection hole is provided on the shell assembly so that coolant can be injected into the battery pack when thermal runaway occurs, wherein the rupture piece includes a frame and a fragment group, and the frame is connected to the shell assembly and the fragment group is connected to the frame to block the injection hole to ensure the airtightness of the battery pack, and a tearing portion is provided on the fragment group and a bending portion is provided at the connection between the fragment group and the frame. When thermal runaway occurs, the coolant delivery pipe is docked with the rupture piece, and under the impact of external coolant, at least part of the fragment group is broken along the tearing portion and bent inward along the bending portion to open the injection hole, so as to facilitate the entry of coolant, timely extinguish the fire and reduce the temperature. Therefore, the battery pack shell provided by the present application, the fragment group on the rupture piece can be torn and bent along a set path, avoiding or reducing the secondary damage to the battery cell caused by the fragments entering the battery pack, thereby reducing losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] Figure 1 A schematic diagram of the structure of the battery pack provided in an embodiment of the present application;

[0027] Figure 2 for Figure 1 Schematic diagram of the installation relationship between the punching part and the shell assembly along the A direction;

[0028] Figure 3 for Figure 2 Cross-sectional view along section BB;

[0029] Figure 4 for Figure 1 Cross-sectional view along CC section;

[0030] Figure 5 for Figure 1 Exploded view in;

[0031] Figure 6 A schematic diagram of a portion of the structure of a vehicle provided in an embodiment of the present application.

[0032] Reference numerals:

[0033] 10: battery cell module;

[0034] 20: tray;

[0035] 21: accommodating cavity;

[0036] 22: chute;

[0037] 30: frame;

[0038] 100: housing assembly;

[0039] 101: injection hole;

[0040] 102: window;

[0041] 110: lower housing;

[0042] 120: upper shell;

[0043] 130: blocking plate;

[0044] 200: breaking parts;

[0045] 201: tearing part;

[0046] 2011: First Tear Department;

[0047] 2012: Second Tear Section;

[0048] 202: bending portion;

[0049] 210: border;

[0050] 220: Fragmentation group;

[0051] 221: First fragment;

[0052] 222: The second fragment. DETAILED DESCRIPTION

[0053] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of methods and apparatus consistent with certain aspects of the present application, as detailed in the appended claims.

[0054] The terms "first," "second," "third," "fourth," etc. (if any) in the specification and claims of the present application and in the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential sequence. It should be understood that the numbers used in this way are interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or apparatus.

[0055] In related technologies, a water inlet hole is opened in the battery pack casing and a metal rupture disc is installed at the water inlet hole to block it. In the event of thermal runaway, the coolant can break through the metal rupture disc and enter the interior, achieving cooling and fire extinguishing. However, the metal rupture disc cannot rupture along the designed shape and size. Once completely broken, it enters the battery pack casing. The large metal piece can easily short-circuit the positive and negative electrodes of the battery cell, increasing the risk of secondary damage to the battery cell and potentially exacerbating thermal runaway.

[0056] In response to the above-mentioned problems existing in the prior art, the present application provides a battery pack housing, a battery pack, and a vehicle. The battery pack housing provided in the present application includes a shell assembly and a rupture member. A liquid injection hole is provided on the shell assembly so that coolant can be injected into the battery pack when thermal runaway occurs. The rupture member includes a frame and a fragment group. The frame is connected to the shell assembly and the fragment group is connected to the frame to block the liquid injection hole and ensure the airtightness of the battery pack. A tearing portion is provided on the fragment group and a bending portion is provided at the connection between the fragment group and the frame. When thermal runaway occurs, the coolant delivery pipe is connected to the rupture member. Under the impact of external coolant, at least part of the fragment group breaks along the tearing portion and bends inward along the bending portion to open the liquid injection hole, facilitating the entry of coolant, timely extinguishing the fire, and reducing the temperature. That is, the fragment group on the rupture member can tear and bend along a set path, avoiding or reducing the secondary damage to the battery cells caused by the fragments entering the battery pack, thereby reducing losses.

[0057] The following specific embodiments are used to describe the technical solution of the present application in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0058] First, refer to Figure 1-Figure 5 As shown, an embodiment of the present application provides a battery pack housing, including a housing assembly 100 and a piercing member 200 , wherein a liquid injection hole 101 is provided on the housing assembly 100 .

[0059] The piercing member 200 includes a frame 210 and a fragment assembly 220 connected to the frame 210 . The frame 210 is connected to the housing assembly 100 to block the liquid injection hole 101 .

[0060] The broken piece group 220 is provided with a tearing portion 201 , and a bending portion 202 is provided at the connection between the broken piece group 220 and the frame 210 .

[0061] At least part of the fragment set 220 is configured to be broken along the tearing portion 201 and bent inward along the bending portion 202 under the impact of the external coolant to open the liquid injection hole 101.

[0062] The housing assembly 100 in this embodiment is used to support and encapsulate the battery module 10 and other components. It can be a rectangular parallelepiped, a cube, or other housing structure. The housing assembly 100 has a cavity inside for mounting the battery module 10. An injection hole 101 is provided on at least one side of the housing assembly 100 to allow coolant to be injected into the battery pack in the event of thermal runaway. The injection hole 101 can be circular, and its position and shape can be determined based on actual needs.

[0063] The rupture member 200 in this embodiment is easy to rupture or break open when subjected to pressure impact. It can be a sheet-like or plate-like structure. The rupture member 200 includes a frame 210 and a fragment group 220. The frame 210 is used to support the fragment group 220. It can be integrally formed with the shell assembly 100, or connected to the shell assembly 100 by welding, bonding, screwing, etc. The fragment group 220 is composed of at least two fragments, and a tearing portion 201 is provided between the fragments, that is, a guide groove or guide line that is easy to tear or break is provided between adjacent fragments. In addition, a bending portion 202 is provided at the connection between the fragment and the frame 210, that is, a guide groove or guide line that is easy to bend is provided between the fragment and the frame 210.

[0064] Specifically, if Figures 1 to 3 As shown, when thermal runaway occurs in the battery pack, the coolant delivery pipe is connected to the rupture member 200. Under the impact of the external coolant, at least part of the fragment group 220 is broken along the tear portion 201 and bent inward along the bending portion 202 to open the liquid injection hole 101. The fragment group 220 is still connected to the frame 210, or only a small amount of small fragments enter the battery pack.

[0065] It can be understood that, compared with the situation where the entire metal sheet is broken and enters the battery pack shell to cause a short circuit in the battery cell, the application of the battery pack shell in this embodiment allows the fragment group 220 on the breaking part 200 to tear and bend along a set path, thereby avoiding or reducing the secondary damage to the battery cell caused by the fragments entering the battery pack, and preventing the damaged battery cell from affecting the remaining normal battery cells as soon as possible to reduce losses.

[0066] Thus, the battery pack housing provided in the embodiment of the present application includes a shell assembly 100 and a rupture member 200, and a liquid injection hole 101 is opened on the shell assembly 100 so that coolant can be injected into the battery pack when thermal runaway occurs, wherein the rupture member 200 includes a frame 210 and a fragment group 220, and the frame 210 is connected to the shell assembly 100, and the fragment group 220 is connected to the frame 210 to block the liquid injection hole 101, and a tearing portion 201 is provided on the fragment group 220, and a tearing portion 201 is provided on the fragment group 220. 0 is connected to the frame 210 with a bending portion 202. When thermal runaway occurs, the coolant delivery pipe is connected to the piercing member 200. Under the impact of the external coolant, at least part of the fragment group 220 is broken along the tearing portion 201 and bent inward along the bending portion 202 to open the injection hole 101, so as to facilitate the entry of coolant and timely extinguish the fire and reduce the temperature. That is, the fragment group 220 on the piercing member 200 can be torn and bent along the set path, thereby avoiding or reducing the secondary damage to the battery cells caused by the fragments entering the battery pack, thereby reducing losses.

[0067] In a possible design, the fragment group 220 includes a first fragment 221 and a plurality of second fragments 222 , and the plurality of second fragments 222 are connected to the circumference of the first fragment 221 .

[0068] The tearing portion 201 includes a first tearing portion 2011 and a second tearing portion 2012. The first tearing portion 2011 is provided at the junction of the first fragment 221 and each second fragment 222, while the second tearing portion 2012 is provided at the junction of adjacent second fragments 222. The first fragment 221 is configured to break along the first tearing portion 2011 under the impact of external coolant.

[0069] Each second broken piece 222 is connected to the frame 210, and the bending portion 202 is provided at the connection between the frame 210 and each second broken piece 222. Each second broken piece 222 is configured to break along the second tear portion 2012 and bend inward along the bending portion 202 under the impact of external coolant.

[0070] Specifically, if Figure 2 As shown, the first fragments 221 can be circular, and the second fragments 222 can be approximately fan-shaped. There can be twelve or another number of the second fragments 222. The second fragments 222 are arranged in a circular array and connected to the sides of the first fragments 221. A first tearing portion 2011 is defined between the first fragment 221 and each second fragment 222, and a second tearing portion 2012 is defined between two adjacent second fragments 222.

[0071] Among them, the first tearing portion 2011 is easy to break at the connection between the first fragment 221 and each second fragment 222 when it is impacted by external coolant, and the second tearing portion 2012 is easy to break between adjacent second fragments 222 when it is impacted by external coolant. Therefore, the first tearing portion 2011 and the second tearing portion 2012 can both be guide grooves or guide lines.

[0072] With this arrangement, when impacted by external coolant, the first fragment 221 can completely break and enter the battery pack. However, the size of the first fragment 221 can be controlled, that is, it can be very small, such as smaller than the distance between the two poles of the battery cell, with little impact. Adjacent second fragments 222 can be selectively broken to expand the area of ​​the liquid inlet. In other words, when only a small amount of liquid is required, only the first fragment 221 is broken. When a large amount of liquid is required, the first fragment 221 and each second fragment 222 are broken, but each second fragment 222 remains connected to the frame 210, that is, the hole is enlarged according to actual needs.

[0073] Furthermore, in this embodiment, the first tear portion 2011 is a first tear groove, the second tear portion 2012 is a second tear groove, and the depth D2 of the second tear groove is less than the depth D1 of the first tear groove.

[0074] Specifically, combined Figure 2 、 Figure 3 As shown, the first tearing groove can be an annular groove concentric with the annular ring, and the second tearing groove can be a radial groove opened along the radial direction of the annular ring. Figure 3 As shown, the depth D2 of the annular groove is less than the depth D1 of the radial groove. This allows the first tear groove to tear more easily than the second tear groove, facilitating the first fragment 221 to be flushed away first. The depths D2 and D1 of the second tear groove can be determined based on practical needs and are not specifically limited in this embodiment.

[0075] Furthermore, in this embodiment, the depth D2 of the second tear groove gradually decreases along the direction approaching the bending portion 202 .

[0076] Specifically, as along Figure 3 As shown in the middle X-axis direction, the depth D2 of the second tear groove gradually decreases, and the side of the second tear groove close to the first tear groove is easy to tear, while the side close to the frame 210 is not easy to tear. That is, the side of the second fragment 222 close to the first tear groove is easy to tear and expand, while the side close to the frame 210 is not easy to tear and not easy to break.

[0077] Furthermore, in this embodiment, the bending portion 202 is a bending groove, one end of the second tearing groove is connected to the bending groove, and the other end of the second tearing groove is connected to the first tearing groove.

[0078] Specifically, if Figure 2 、 Figure 3 As shown, the bending groove can also be an annular groove concentric with the ring. The bending groove is only for facilitating the bending of the second fragments 222 and does not need to be very deep. The second tear groove is connected to the first tear groove to facilitate the tearing between the first fragment 221 and each second fragment 222. The second tear groove is connected to the bending groove to facilitate the bending of each second fragment 222.

[0079] In some embodiments, the housing assembly 100 includes a lower housing 110 and an upper housing 120 covering the lower housing 110 , and a liquid injection hole 101 is provided on at least one side of the upper housing 120 .

[0080] Specifically, if Figure 1 As shown, the lower shell 110 can be surrounded by four side panels and a bottom plate to form a rectangular frame structure, and the upper shell 120 can also be surrounded by four side panels and a top plate to form a rectangular frame structure. The periphery of the lower shell 110 and the upper shell 120 can be connected by screwing, snapping, etc. to facilitate the installation of the battery module 10, etc.

[0081] In addition, a liquid injection hole 101 is provided on at least one side of the upper shell 120 to facilitate emergency treatment in the event of thermal runaway. The liquid injection hole 101 can be provided at a higher position so that the coolant can fill the inner cavity of the battery pack.

[0082] Furthermore, in this embodiment, the housing assembly 100 further includes a blocking plate 130 , and a window 102 is provided on at least one side of the lower housing 110 .

[0083] The blocking plate 130 is detachably connected to the lower housing 110 to block the window 102 .

[0084] Set it up like this, Figure 1 、 Figure 4 As shown, if the battery pack experiences minor faults, repairs can be performed through window 102 without disassembling the battery pack. The blocking plate 130 can be connected to the lower housing 110 by screwing, snapping, or other means to facilitate assembly and disassembly. The size and connection method of the window 102 and blocking plate 130 can be determined based on actual needs and are not specifically limited in this embodiment.

[0085] In a second aspect, an embodiment of the present application further provides a battery pack, comprising a battery cell module 10 and a battery pack casing provided in any of the above embodiments, wherein the battery cell module 10 is disposed in the battery pack casing.

[0086] Among them, the structure of the battery pack shell is described in detail in the above embodiments and will not be repeated here.

[0087] Specifically, a plurality of battery cell modules 10 may be installed side by side in the battery pack housing, or a plurality of battery cell modules 10 may be installed in a stacked manner, and the battery cell modules 10 may be fixed to the battery pack housing by screwing, bonding, snapping, or the like.

[0088] The battery pack provided in the embodiment of the present application is configured with a battery pack shell, including a shell assembly 100 and a rupture member 200, and a liquid injection hole 101 is opened on the shell assembly 100 so that coolant can be injected into the battery pack when thermal runaway occurs, wherein the rupture member 200 includes a frame 210 and a fragment group 220, and the frame 210 is connected to the shell assembly 100, and the fragment group 220 is connected to the frame 210 to block the liquid injection hole 101, and a tearing portion 201 is provided on the fragment group 220, and a tearing portion 201 is provided on the fragment group A bending portion 202 is provided at the connection between 220 and the frame 210. When thermal runaway occurs, the coolant delivery pipe is connected to the rupture component 200. Under the impact of the external coolant, at least part of the fragment group 220 is broken along the tearing portion 201 and bent inward along the bending portion 202 to open the injection hole 101, so as to facilitate the entry of coolant, timely extinguish the fire and reduce the temperature. That is, the fragment group 220 on the rupture component 200 can be torn and bent along the set path, avoiding or reducing the secondary damage to the battery cell caused by the fragments entering the battery pack, thereby reducing losses.

[0089] Furthermore, in this embodiment, at least one tray 20 is included. The tray 20 is provided with a receiving cavity 21 . The tray 20 is disposed in the battery pack housing, and the battery cell module 10 is disposed in the receiving cavity 21 .

[0090] A flow channel 22 is defined on at least one side of the tray 20 . The flow channel 22 is higher than or equal to the upper surface of the battery cell module 10 .

[0091] Specifically, if Figure 5 As shown, the tray 20 can be enclosed by four side panels and a bottom panel to form a rectangular frame structure, which facilitates the installation of the battery cell module 10 within the tray 20. A flow channel 22 is provided on at least one side of the tray 20 to allow coolant to flow through the flow channel 22 into the accommodating cavity 21. Furthermore, the flow channel 22 is higher than or equal to the upper surface of the battery cell module 10 so that the coolant can submerge the battery cell module 10, thereby achieving better cooling and fire extinguishing effects.

[0092] It should be noted that the cross section of the flow groove 22 gradually expands in a direction away from the accommodating cavity 21 so that the coolant can flow smoothly into the accommodating cavity 21 .

[0093] In addition, if Figure 4 As shown, the tray 20 can be provided in two layers, and the tray 20 of the lower layer can be integrally formed with the lower shell 110, that is, they share the same bottom plate, making the structure more compact.

[0094] In a third aspect, an embodiment of the present application further provides a vehicle, comprising a vehicle body, on which is disposed a battery pack provided by any of the above embodiments.

[0095] Among them, the vehicles here can be new energy light trucks, new energy heavy trucks, new energy commercial vehicles, etc. Figure 6 As shown, the battery pack can be fixedly connected to the bottom of the frame 30 for easy assembly and disassembly, which is also beneficial for battery replacement.

[0096] The vehicle provided in the embodiment of the present application is configured with a battery pack having a battery pack housing, including a housing assembly 100 and a rupture member 200. A liquid injection hole 101 is provided on the housing assembly 100 so that coolant can be injected into the battery pack when thermal runaway occurs. The rupture member 200 includes a frame 210 and a fragment group 220. The frame 210 is connected to the housing assembly 100, and the fragment group 220 is connected to the frame 210 to block the liquid injection hole 101. A tearing portion 201 is provided on the fragment group 220. A bending portion 202 is provided at the connection between the fragment group 220 and the frame 210. When thermal runaway occurs, the coolant delivery pipe is connected to the piercing member 200. Under the impact of the external coolant, at least part of the fragment group 220 is broken along the tearing portion 201 and bent inward along the bending portion 202 to open the injection hole 101, so as to facilitate the entry of coolant, timely extinguish the fire and reduce the temperature. That is, the fragment group 220 on the piercing member 200 can be torn and bent along the set path, avoiding or reducing the secondary damage to the battery cells caused by the fragments entering the battery pack, thereby reducing losses.

[0097] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present application are indicated by the claims.

[0098] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A battery pack housing, characterized in that: include: A housing assembly (100), wherein a liquid injection hole (101) is provided on the housing assembly (100); A breaking piece (200), the breaking piece (200) comprising a frame (210) and a fragment group (220) connected to the frame (210), the frame (210) being connected to the housing assembly (100) to block the liquid injection hole (101); The fragment group (220) is provided with a tearing portion (201), and a bending portion (202) is provided at the connection between the fragment group (220) and the frame (210); At least part of the fragment group (220) is configured to be broken along the tearing portion (201) and bent inward along the bending portion (202) under the impact of external coolant to open the liquid injection hole (101).

2. The battery pack housing according to claim 1, wherein: The fragment group (220) comprises a first fragment (221) and a plurality of second fragments (222), wherein the plurality of second fragments (222) are connected to the circumference of the first fragment (221); The tearing portion (201) comprises a first tearing portion (2011) and a second tearing portion (2012), wherein the first tearing portion (2011) is arranged at the connection between the first fragment (221) and each second fragment (222), and the second tearing portion (2012) is arranged at the connection between adjacent second fragments (222); the first fragment (221) is configured to be broken along the first tearing portion (2011) under the impact of the external coolant; Each second broken piece (222) is connected to the frame (210), and the bending portion (202) is arranged at the connection between the frame (210) and each second broken piece (222); each second broken piece (222) is configured to be broken along the second tearing portion (2012) and bent inward along the bending portion (202) under the impact of the external coolant.

3. The battery pack housing according to claim 2, wherein: The first tearing portion (2011) is a first tearing groove, and the second tearing portion (2012) is a second tearing groove, and the depth of the second tearing groove is smaller than the depth of the first tearing groove.

4. The battery pack housing according to claim 3, wherein: The depth of the second tear groove gradually decreases in a direction approaching the bending portion (202).

5. The battery pack housing according to claim 3, wherein: The bending portion (202) is a bending groove, one end of the second tearing groove is connected to the bending groove, and the other end of the second tearing groove is connected to the first tearing groove.

6. The battery pack casing according to any one of claims 1 to 5, characterized in that: The housing assembly (100) comprises a lower housing (110) and an upper housing (120) covering the lower housing (110), and the liquid injection hole (101) is provided on at least one side of the upper housing (120).

7. The battery pack housing according to claim 6, wherein: The housing assembly (100) further includes a blocking plate (130), and a window (102) is provided on at least one side of the lower housing (110); The blocking plate (130) is detachably connected to the lower shell (110) to block the window (102).

8. A battery pack, characterized in that: It comprises a battery cell module (10) and a battery pack casing according to any one of claims 1 to 7, wherein the battery cell module (10) is arranged in the battery pack casing.

9. The battery pack according to claim 8, characterized in that: The battery pack further comprises at least one tray (20), wherein the tray (20) is provided with a receiving cavity (21), the tray (20) is arranged in the battery pack housing, and the battery cell module (10) is arranged in the receiving cavity (21); A flow groove (22) is provided above at least one side of the tray (20), and the flow groove (22) is higher than or equal to the upper surface of the battery cell module (10).

10. A vehicle, characterized in that: The vehicle comprises a vehicle body on which the battery pack according to claim 8 or 9 is arranged.

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