Battery assembly and battery cabinet

Abstract

The utility model discloses a battery assembly and a battery cabinet, the battery assembly comprises a shell and a battery module, the battery module is installed in an installation cavity inside the shell, the shell is provided with at least one liquid leakage hole, and the liquid leakage hole penetrates through the inside and the outside of the installation cavity so as to guide electrolyte to flow out of the installation cavity when the electrolyte of the battery module leaks. Therefore, the influence on the safe use of the battery cabinet is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cabinets, in particular to a battery assembly and a battery cabinet. Background Art

[0002] There are multiple battery assemblies placed inside the battery cabinet. The battery assembly is generally equipped with a battery module. The battery module generally includes multiple battery cells, and the main component of the battery cell is electrolyte. During the use of the battery cabinet, the battery cell may experience thermal runaway, causing the temperature and pressure inside the battery cell to rise, and the electrolyte to spray out from the pressure relief valve of the battery cell, causing the electronic control part of the battery assembly to short-circuit, thereby affecting the safe use of the entire battery cabinet. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned defects or problems existing in the background technology and to provide a battery assembly and a battery cabinet, which can discharge the electrolyte out of the battery assembly when the electrolyte leaks, thereby reducing the impact on the safe use of the battery cabinet.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] Technical solution 1: A battery assembly, comprising: a shell, an installation cavity is formed inside the shell; a battery module is installed in the installation cavity; the shell is provided with at least one leakage hole, and the leakage hole passes through the inside and outside of the installation cavity to guide the electrolyte to flow out of the installation cavity when the electrolyte of the battery module leaks.

[0006] Technical solution 2 is based on technical solution 1: the leakage hole is arranged on the bottom plate of the shell.

[0007] Technical solution 2 is based on technical solution 1: the leakage hole is arranged at the front position of the bottom plate of the shell.

[0008] Technical solution 2 is based on technical solution 1: the leakage hole is arranged at the front part of the bottom plate of the shell and close to the left and right sides.

[0009] Technical solution two is based on technical solution one: the bottom plate and the front plate of the shell are fixedly connected; the front edge of the bottom plate protrudes forward to set a first flange, and the front edge of the bottom plate is provided with a leakage gap with a front end opening at the left and right ends of the first flange; the bottom edge of the front plate protrudes backward to set a second flange, and the second flange is suitable for overlapping with the first flange, and after the bottom plate and the front plate are fixedly connected, the second flange blocks the opening at the front end of the leakage gap to form the leakage hole.

[0010] Technical solution six, which is based on technical solution five: the battery module includes a plurality of battery cells and a module shell, and the module shell is provided with a through liquid port, and the liquid port is suitable for allowing electrolyte to pass through.

[0011] Technical solution seven is based on technical solution six: the inner wall of the base plate is provided with a baffle extending in the left and right directions, the baffle is located in front of the battery module to limit the forward and backward movement of the battery module, and the baffle is provided with a liquid-passing notch running through the front and back.

[0012] In addition, the utility model also provides technical solution eight: a battery cabinet for placing battery assemblies as described in any one of the above technical solutions one to seven, comprising: a cabinet body, which includes a plurality of columns and a plurality of support rails fixed to the columns; wherein every two of the support rails cooperate to support one of the battery assemblies.

[0013] Technical solution nine is based on technical solution eight: the cabinet also includes a liquid storage tray, which is located at the bottom of the cabinet and is suitable for receiving and storing electrolyte leaked from the battery assembly above it.

[0014] Technical solution ten is based on technical solution nine: each leakage hole in the battery assembly is arranged close to a corresponding column, and the column is provided with a vertically penetrating liquid guide groove, and the liquid guide groove is used to guide the electrolyte leaked from each battery assembly to the liquid storage tray.

[0015] From the above description of the utility model, it can be seen that compared with the prior art, the utility model has the following beneficial effects:

[0016] In technical solution one, a leakage hole is provided on the shell, and the leakage hole can pass through the inside and outside of the installation cavity. When the electrolyte of the battery module installed in the installation cavity leaks, the electrolyte can be quickly discharged from the installation cavity through the leakage hole to avoid accumulation in the installation cavity, thereby reducing the impact on the safe use of the battery assembly and battery cabinet.

[0017] In technical solution two, the leakage hole is arranged on the bottom plate of the shell. The bottom plate is located at the bottom of the shell, and the leakage hole is therefore also located at the bottom of the shell. The leaked electrolyte in the installation cavity will gather at the bottom of the installation cavity. Therefore, the leakage hole is arranged on the bottom plate of the shell to discharge as much electrolyte as possible from the installation cavity, thereby increasing the discharge ratio of the electrolyte and avoiding excessive electrolyte accumulation at the bottom of the installation cavity.

[0018] In technical solution three, since the wiring components of the battery assembly are generally arranged at the rear end position, the leakage hole is arranged at the front position of the bottom plate of the shell, so that the leaked electrolyte can flow downward from the front of the battery assembly to avoid affecting the wiring components of the battery assembly, thereby improving the safety of the entire battery cabinet when the electrolyte leaks.

[0019] In technical solution four, the leakage hole is arranged at the front of the bottom plate of the shell and close to the left and right sides. The leaked electrolyte will flow downward from the left and right sides of the battery assembly. At the same time, the electrolyte flow can be guided through the columns of the battery cabinet to restrict the electrolyte flow range and reduce the electrolyte contamination area.

[0020] In technical solution five, the bottom plate of the shell is fixedly joined with the front plate, and the first flange and the second flange are respectively provided on the two. The overlapping joint of the first flange and the second flange can improve the structural stability of the shell during assembly. At the same time, the leakage gap is blocked by the second flange to form a leakage hole, instead of directly forming the leakage hole on the bottom plate. That is, it is only necessary to groove the front edge of the bottom plate to form a gap, and no drilling is required, which can reduce the manufacturing difficulty and cost and improve the manufacturing efficiency.

[0021] In technical solution six, a liquid outlet is provided in the module housing of the battery module so that the electrolyte leaked from the battery cell can be discharged from the battery module into the installation cavity, and then discharged to the outside of the installation cavity through the leakage hole.

[0022] In Technical Solution 7, a baffle is provided on the inner wall of the bottom plate to prevent the battery module from changing position during transportation. At the same time, the leakage hole is located on the front side of the baffle, so a liquid gap is provided on the baffle, and the electrolyte can flow to the leakage hole through the liquid gap.

[0023] In technical solution eight, a battery cabinet is provided, which supports and places multiple battery assemblies mentioned above through columns and support rails. When electrolyte leakage occurs in these battery assemblies, the electrolyte can be quickly discharged to the outside of the shell through the leakage holes on the shell of the battery assembly, thereby reducing the impact on the safe use of the battery cabinet.

[0024] In technical solution nine, a liquid storage tray is provided at the bottom of the cabinet, and the electrolyte flows downward and is received and stored by the liquid storage tray, which can prevent the electrolyte from flowing outside the battery cabinet and affecting other equipment in the computer room.

[0025] In technical solution ten, the leakage hole of the battery assembly is arranged near the column of the cabinet, and a liquid guide groove is arranged in the column. When the electrolyte flows out from the leakage hole, it will be blocked by the battery assembly on the lower side, and then flow to the side into the liquid guide groove. Along the liquid guide groove, the electrolyte can smoothly reach the liquid storage tray, and the electrolyte will not flow around. The impact of electrolyte leakage on other normally used battery assemblies in the battery cabinet can be effectively reduced, and the safety of the battery cabinet can also be improved when the electrolyte leaks. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A partial structural schematic diagram of a battery cabinet provided in an embodiment of the utility model;

[0028] Figure 2 A schematic diagram of a battery assembly provided by an embodiment of the utility model;

[0029] Figure 3 An exploded view of the structure of a battery assembly provided in an embodiment of the utility model;

[0030] Figure 4 A bottom schematic diagram of a battery assembly provided by an embodiment of the utility model;

[0031] Figure 5 for Figure 2 Enlarged view of part A in the middle;

[0032] Figure 6 for Figure 2 Enlarged view of part B;

[0033] Figure 7 for Figure 3 Enlarged view of part C in the middle;

[0034] Figure 8 A partial structural schematic diagram of a battery cabinet provided in an embodiment of the utility model;

[0035] Fig. 9 A partial structural schematic diagram of a battery cabinet provided in an embodiment of the utility model.

[0036] Description of main reference numerals:

[0037] Battery assembly 1; shell 2; battery module 3; leakage hole 4; bottom plate 5; front plate 6; first flange 7; leakage notch 8; second flange 9; battery cell 10; module shell 11; liquid outlet 12; baffle 13; liquid notch 14; battery cabinet 15; cabinet body 16; column 17; support rail 18; liquid storage tray 19; liquid guide groove 20; top plate 21; back plate 22; handle 23; cabinet plate 24; first groove wall 25; second groove wall 26; bottom plate front edge 27. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are preferred embodiments of the utility model and should not be regarded as excluding other embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0039] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. is to distinguish different objects rather than to describe a specific order.

[0040] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the specific protection scope of the utility model.

[0041] In the claims, specification and the above drawings of the utility model, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0042] In the claims, specification and drawings of the present utility model, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0043] Reference Figure 1 The embodiment of the utility model provides a battery cabinet 15 , which includes a cabinet body 16 and a plurality of battery assemblies 1 , wherein the battery assemblies 1 are placed inside the cabinet body 16 .

[0044] The battery assembly 1 is first described below. The battery assembly 1 includes a housing 2 and a battery module 3 .

[0045] Figure 2 The appearance of the battery assembly 1 is shown. Figure 3The battery assembly 1 includes a shell 2 and a battery module 3. The shell 2 includes a bottom plate 5, a front plate 6, a top plate 21, a rear plate 22 and a handle 23. The bottom plate 5 is located at the bottom, the top plate 21 is located at the top, the front plate 6 is located at the front end, the rear plate 22 is located at the rear end, and the left edge of the bottom plate 5 extends upward to form a left side plate, and the right edge of the top plate 21 extends downward to form a right side plate. The above four are fixedly matched by bolts or rivets to form the shell 2 of the battery assembly 1, and an installation cavity is formed inside the shell 2. There are two handles 23, which are fixedly installed at the front positions of the left and right sides of the shell 2, respectively, and the fixed positions are the left and right plates, respectively, which are used to pull the entire battery assembly 1.

[0046] Reference Figure 3 The battery module 3 is located in the installation cavity of the shell 2, and includes a plurality of battery cells 10 and a module housing 11. "Battery cell 10" generally refers to the core part of the battery, which is a component in the battery that stores electrical energy. The battery cell 10 is generally composed of a positive electrode, a negative electrode, an electrolyte, and a separator. It is the main component of the battery and is responsible for storing and releasing electrical energy. The type and structure of the battery cell 10 vary depending on the type of battery. Common battery cells 10 include lithium-ion battery cells 10, nickel-metal hydride battery cells 10, lead-acid battery cells 10, and the like. In the present embodiment, the battery module 3 uses a lithium-ion battery cell 10, which has the advantages of high energy density, light weight, and long life.

[0047] The module shell 11 of the battery module 3 is used to isolate the battery cells 10 from the interior of the installation cavity, so as to facilitate the installation of other electrical components inside the installation cavity, such as a DC-DC converter, etc., to prevent the battery cells 10 from affecting other electrical components inside the installation cavity due to thermal runaway during use.

[0048] Among them, at least one leakage hole 4 is provided on the shell 2, and the leakage hole 4 runs through the inside and outside of the installation cavity to guide the electrolyte to flow out of the installation cavity when the electrolyte of the battery module 3 leaks. Specifically, when the battery cell 10 of the battery module 3 is abnormal, the electrolyte inside it may surge out from the pressure relief valve on the battery cell 10. At this time, if the electrolyte is not discharged out of the battery assembly 1 in time, the accumulated electrolyte will affect other non-leaking battery cells 10, and will also affect the normal use of electrical components in the battery assembly 1, causing short circuits, fires and other dangerous conditions. Therefore, a leakage hole 4 is provided on the shell 2, and the electrolyte is quickly discharged to the outside of the battery assembly 1 through the leakage hole 4 to reduce the impact on the safe use of the battery cabinet 15.

[0049] As an embodiment, the leakage hole 4 can be provided on the bottom plate 5 of the housing 2. It should be understood that the purpose of providing the leakage hole 4 on the bottom plate 5 is to discharge as much electrolyte as possible from the installation cavity, increase the electrolyte discharge ratio, and avoid excessive electrolyte accumulation at the bottom of the installation cavity. Therefore, the "leakage hole 4 is provided on the bottom plate 5 of the housing 2" here should be understood as that the leakage hole 4 is provided at the bottom of the housing 2 regardless of the specific structure of the bottom plate 5.

[0050] As an embodiment, the leakage hole 4 may be provided at the front position of the bottom plate 5 of the housing 2. Specifically, the front position of the bottom plate 5 refers to the position close to the front plate 6 of the housing 2, which may not be the frontmost edge of the bottom plate 5, but should be within a suitable range, which can reasonably determine that the position of the leakage hole 4 belongs to the front position of the bottom plate 5 of the housing 2. Among them, since the wiring components of the battery assembly 1 are generally provided at the rear end position, the leakage hole 4 is provided at the front position of the bottom plate 5 of the housing 2, so that the leaked electrolyte can flow downward from the front of the battery assembly 1, avoiding affecting the wiring components of the battery assembly 1, and improving the safety of the entire battery cabinet 15 when the electrolyte leaks.

[0051] In this embodiment, the leakage hole 4 is not only provided on the bottom plate 5 of the housing 2, but also located at the front of the bottom plate 5 of the housing 2 and close to the left and right sides. Figure 7 , which is Figure 4 The enlarged view of part C in the middle. Figure 7 The specific shape of the leakage hole 4 is shown in FIG. Figure 4 It can be seen that the leakage hole 4 is arranged near the left and right sides of the housing 2. When the leakage hole 4 is arranged near the left and right sides of the housing 2, the leaked electrolyte will flow downward from the left and right sides of the battery assembly 1, reducing the electrolyte contamination site.

[0052] Reference Figure 3 and Figure 5 , Figure 5 for Figure 3 The enlarged view of part A in FIG. Figure 5 The front edge 27 of the bottom plate of the shell 2 protrudes forward to set the first flange 7. At the same time, the front edge 27 of the bottom plate is provided with a leakage notch 8 with a front opening at the left and right ends of the first flange 7. The position of the leakage notch 8 is still a certain distance from the right edge of the bottom plate 5, and the leakage notch 8 is a groove-shaped structure recessed toward the rear of the shell 2, and its opening faces the front of the shell 2. Figure 3 and Figure 7 The bottom edge of the front plate 6 protrudes backward to form a second flange 9, which is suitable for overlapping with the first flange 7. After the bottom plate 5 and the front plate 6 are fixedly connected, the second flange 9 blocks the opening at the front end of the leakage gap 8 to form a leakage hole 4. Figure 3In this embodiment, when the front plate 6 and the floor are fixedly matched, the second flange 9 of the front plate 6 will support the first flange 7 from below to form an overlapped fit. This installation structure can improve the structural stability of the front plate 6 and the bottom plate 5 after assembly. At the same time, the leakage hole 4 is formed by the cooperation of the front plate 6 and the bottom plate 5. During manufacturing, it is only necessary to form a groove-shaped leakage notch 8 at the front edge 27 of the bottom plate without drilling the bottom plate 5, which can reduce the manufacturing difficulty and cost and improve the manufacturing efficiency.

[0053] In addition, refer to Figure 3 and Figure 6 The module housing 11 of the battery module 3 is provided with a through-flowing liquid port 12. When the electrolyte of the battery cell 10 in the battery module 3 leaks, the electrolyte will first accumulate inside the module housing 11. At this time, the electrolyte can flow into the installation cavity through the through-flowing liquid port 12. At the same time, a baffle 13 extending in the left and right directions is provided on the inner wall of the bottom plate 5. The baffle 13 is located in front of the battery module 3 to limit the forward and backward movement of the battery module 3, but the baffle 13 also limits the smooth outflow of the electrolyte. Therefore, a through-flowing liquid notch 14 is provided on the baffle 13 to pass through the front and back, and the electrolyte can flow from the through-flowing liquid notch 14 to the leakage hole 4. Preferably, the position of the through-flowing liquid port 12 of the module housing 11 is as close as possible to the inner wall of the bottom plate 5, and the depth of the through-flowing liquid notch 14 on the baffle 13 is also as flush as possible with the inner wall of the bottom plate 5, and the positions of the through-flowing liquid port 12, the through-flowing liquid notch 14 and the leakage hole 4 in the left and right directions are roughly corresponding to each other, so as to shorten the flow path of the electrolyte. It should be noted that the above-mentioned "a liquid-passing gap 14 penetrating front to back is provided on the baffle bar 13" not only refers to the situation where the liquid-passing gap 14 is directly formed on the baffle bar 13, but also includes the situation where the baffle bar 13 includes two independent components and the gap between the two components forms the liquid-passing gap 14.

[0054] In the battery cabinet 15 provided in this embodiment, a plurality of battery assemblies 1 are placed in a stacked manner in the cabinet body 16. Figure 1 and Fig. 9 The cabinet body 16 mainly includes a column 17, a support rail 18, a cabinet board 24 and a liquid storage tray 19.

[0055] In this embodiment, four columns 17 are provided, and the four columns are arranged so that the cabinet 16 forms an upright rectangular structure. Of course, in other embodiments, the number of columns 17 can be increased to improve the load-bearing capacity of the cabinet 16 for the battery assembly 1. The cabinet plate 24 is also fixed to the columns 17 by bolts, and the cabinet plate 24 covers the left side, right side, top and rear side of the cabinet 16, and the front side of the cabinet 16 is closed and opened by a swing door.

[0056] In the case of setting four columns 17, the front and rear ends of the plurality of support rails 18 are fixedly mounted on the columns 17 at the front and rear positions by bolts or rivets, and at the same time, every two support rails 18 cooperate with each other to support a battery assembly 1, and the height positions of the two support rails 18 are consistent to ensure the stable placement of the battery assembly 1. At the same time, the height interval of the support rails 18 should meet the conditions for the battery assembly 1 to enter. Through the support rails 18, multiple battery assemblies 1 can be stacked and placed in the cabinet 16.

[0057] Among them, refer to Figure 8 The liquid storage tray 19 is located at the bottom of the cabinet 16, and is suitable for receiving and storing the electrolyte leaked from the battery assembly 1 above it. Specifically, the liquid storage tray 19 is a square shallow tray, and a side wall extends upward around it, and a liquid storage space is enclosed by the side wall. When the electrolyte of the battery assembly 1 leaks, the electrolyte flows downward and is finally received and stored by the liquid storage tray 19, thereby preventing the electrolyte from flowing outside the battery cabinet 15 and affecting other equipment in the machine room.

[0058] In addition, refer to Fig. 9 When the battery assembly 1 is placed in place, the positions of the two leakage holes 4 on the battery assembly 1 are close to the two columns 17 located on the left and right sides of the front, and the two columns 17 are provided with a vertically penetrating liquid guide groove 20, which is used to guide the electrolyte leaked from each battery assembly 1 to the liquid storage tray 19. Specifically, on the left and right sides of the front columns 17, a first groove wall 25 and a second groove wall 26 are formed on the inner side, and the vertically penetrating liquid guide groove 20 is formed between the first groove wall 25 and the second groove wall 26, and the position of the liquid guide groove 20 and the leakage hole 4 in the front-back direction roughly corresponds. When the electrolyte leaks from the leakage hole 4, it will be blocked by the battery assembly 1 on the lower side, and thus flow to the side into the liquid guide groove 20. Along the liquid guide groove 20, the electrolyte can smoothly reach the liquid storage tray 19, and the electrolyte will not flow around. This can effectively reduce the impact of electrolyte leakage on other normally used battery assemblies 1 in the battery cabinet 15, and can also improve the safety of the battery cabinet 15 when the electrolyte leaks.

[0059] The description of the above specification and embodiments is used to explain the protection scope of the utility model, but does not constitute a limitation on the protection scope of the utility model. Through the enlightenment of the utility model or the above embodiments, ordinary technicians in this field can obtain modifications, equivalent replacements or other improvements to the embodiments of the utility model or part of the technical features thereof through logical analysis, reasoning or limited experiments, which should be included in the protection scope of the utility model.

Claims

1. A battery assembly (1), characterized in that: include: A housing (2) having a mounting cavity formed therein; A battery module (3) is installed in the installation cavity; the battery module (3) comprises a plurality of battery cells (10) and a module housing (11); the module housing (11) is provided with a through-flow port (12), and the through-flow port (12) is suitable for allowing electrolyte to pass through; The housing (2) is provided with at least one leakage hole (4), and the leakage hole (4) passes through the inside and outside of the installation cavity so as to When the electrolyte of the battery module (3) leaks, the electrolyte is guided to flow out of the installation cavity.

2. A battery assembly (1) as claimed in claim 1, characterized in that: The liquid leakage hole (4) is arranged on the bottom plate (5) of the shell (2).

3. A battery assembly (1) as claimed in claim 1, characterized in that: The liquid leakage hole (4) is arranged at the front position of the bottom plate (5) of the shell (2).

4. A battery assembly (1) as claimed in claim 1, characterized in that: The liquid leakage hole (4) is arranged at the front part of the bottom plate (5) of the housing (2) and close to the left and right sides.

5. A battery assembly (1) as claimed in claim 1, characterized in that: The bottom plate (5) and the front plate (6) of the shell (2) are fixedly connected; the front edge of the bottom plate (5) protrudes forward to form a first flange (7), and the front edge of the bottom plate (5) is provided with a liquid leakage notch (8) with a front end opening at the left and right ends of the first flange (7); the bottom edge of the front plate (6) protrudes backward to form a second flange (9), the second flange (9) is suitable for overlapping with the first flange (7), and after the bottom plate (5) and the front plate (6) are fixedly connected, the second flange (9) covers the opening at the front end of the liquid leakage notch (8) to form the liquid leakage hole (4).

6. A battery assembly (1) as claimed in claim 5, characterized in that: The inner wall of the bottom plate (5) is provided with a baffle (13) extending in the left-right direction, the baffle (13) is located in front of the battery module (3) to limit the forward and backward movement of the battery module (3), and the baffle (13) is provided with a liquid-passing notch (14) penetrating forward and backward.

7. A battery cabinet (15) for accommodating a battery assembly (1) as claimed in any one of claims 1 to 6, characterized in that: include: A cabinet (16) comprising a plurality of columns (17) and a plurality of support rails (18) fixedly connected to the columns (17); Wherein, every two of the support rails (18) cooperate to support one of the battery assemblies (1).

8. A battery cabinet (15) as claimed in claim 7, characterized in that: The cabinet (16) further comprises a liquid storage tray (19), which is located at the bottom of the cabinet (16) and is suitable for receiving and storing electrolyte leaked from the battery assembly (1) above it.

9. A battery cabinet (15) as claimed in claim 8, characterized in that: Each leakage hole (4) in the battery assembly (1) is arranged close to a corresponding column (17), and the column (17) is provided with a vertically penetrating liquid guide groove (20), and the liquid guide groove (20) is used to guide the electrolyte leaked from each battery assembly (1) to the liquid storage tray (19).

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