Battery module

Abstract

The utility model discloses a battery module and belongs to the technical field of battery protection. The battery module comprises a box body, a battery cell assembly, an upper cover and a BMS plate, the battery cell assembly is arranged in the box body, the BMS plate is mounted in the upper cover, an opening is formed in the box body, and the upper cover covers the opening; the battery cell assembly comprises a support and a battery cell arranged in the support, and the BMS plate is located on the support and electrically connected with the battery cell; the battery module further comprises a protection part, the protection part is connected into the upper cover, the battery cell sprays towards the outer side face of the protection part, and the protection part is arranged on the outer side of the BMS plate in a surrounding mode and abuts against the support so as to separate the BMS plate from the battery cell. According to the battery module disclosed by the utility model, the BMS plate and the battery cell are separated through the protection piece and the bracket, so that the BMS plate and the battery cell can be better protected, the safety of the battery cell during thermal runaway is improved, and meanwhile, the battery module can be ensured to be smaller in occupied area and better in structural compactness.

Description

Technical Field

[0001] The utility model relates to the technical field of battery protection, in particular to a battery module. Background Art

[0002] In a cylindrical battery module, in order to avoid the thermal interaction between the cylindrical battery cell and the BMS board, two separated cavities are usually set in the box of the cylindrical battery module, so that the cylindrical battery cell and the BMS board are placed in two different cavities respectively, so as to achieve physical separation between the cylindrical battery cell and the BMS board. Among them, the BMS board specifically refers to a circuit board used to monitor and protect the cylindrical battery cell.

[0003] However, due to the separation method of the two cavities mentioned above, a larger box body is required, so that the entire cylindrical battery module occupies a larger area and the compactness of the structure inside the box body is poor. Utility Model Content

[0004] The utility model aims to provide a battery module, which can improve the safety of the battery cell during thermal runaway, and at the same time ensure that the battery module occupies a small area and has a good compact structure.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A battery module comprises a box, a battery cell assembly, an upper cover and a BMS board, wherein the battery cell assembly is arranged in the box, the BMS board is installed in the upper cover, the box is provided with an opening, and the upper cover is arranged on the opening; the battery cell assembly comprises a bracket and a battery cell arranged in the bracket, the BMS board is located on the bracket and is electrically connected to the battery cell, and the battery module further comprises:

[0007] A protective member is connected to the upper cover, the battery cell is ejected toward the outer side of the protective member, and the protective member is arranged around the outer side of the BMS board and abuts against the bracket to separate the BMS board and the battery cell.

[0008] As an optional solution, the protective member and the upper cover are an integrally formed structure.

[0009] As an optional solution, the melting point of the protective element is 200°C-220°C.

[0010] As an optional solution, the outer side surface of the protective member is flush with the outer side surface of the bracket, a notch is provided on the outer side surface of the bracket for exposing the injection end of the battery cell, and the explosion-proof structure of the battery cell is arranged corresponding to the notch.

[0011] As an optional solution, the protective element includes:

[0012] A U-shaped plate and a notch plate, wherein the notch plate is located at the opening side of the U-shaped plate, an avoidance notch is arranged on the notch plate, and both the U-shaped plate and the notch plate are in contact with the bracket.

[0013] As an optional solution, an explosion-proof valve is provided on the box body, and the explosion-proof valve, the notch plate and the injection end of the battery cell are located on the same side of the box body.

[0014] As an optional solution, a mounting block is further provided on the upper cover, and the mounting block is used to mount a pole, the pole is electrically connected to the BMS board, and the mounting block is located at the avoidance gap.

[0015] As an optional solution, the connection between the pole and the BMS board is sealed.

[0016] As an optional solution, the upper cover is sealed to the box body, and the connecting wires connected to the BMS board pass through the bracket in a sealed manner.

[0017] As an optional solution, the battery module further includes:

[0018] A bus bar, one end of which is electrically connected to the BMS board, and the other end of which is electrically connected to the battery cell.

[0019] The beneficial effects of the utility model are:

[0020] The BMS board is installed in the upper cover and located on the bracket of the battery cell assembly, and the battery cell is sprayed toward the outer side of the protective member, and then the protective member is arranged in the upper cover, so that the protective member is arranged around the outer side of the BMS board and abuts against the bracket, so that the BMS board and the battery cell can be completely separated by the protective member and the bracket; when the battery cell has thermal runaway and generates high-temperature and high-pressure gas, due to the isolation effect of the bracket and the protective member, the generated gas will not be sprayed to the BMS board, ensuring that the BMS board is not damaged, so that the BMS board can report the thermal runaway alarm signal in time, buy a certain amount of time for escape, and thus improve the safety during thermal runaway; at the same time, the heat generated by the BMS board during operation will not flow to the battery cell, avoiding the battery cell from being heated, so as to better protect the battery cell and thus increase the service life of the battery cell; by arranging the protective member between the bracket of the battery cell assembly and the upper cover, compared with directly arranging two separated cavities in the box body, a larger box body is not required, so that the structure of the entire box body occupies a smaller area and has a better compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a battery module provided by the utility model;

[0022] Figure 2 It is a schematic diagram of the exploded structure of the battery module provided by the utility model;

[0023] Figure 3 It is a schematic diagram of the assembly structure between the protective member and the bracket provided by the utility model;

[0024] Figure 4 It is a schematic diagram of the structure of the upper cover and the protective member provided by the utility model when they are not assembled at a viewing angle;

[0025] Figure 5 It is a schematic structural diagram of the upper cover and the protective member provided by the utility model when they are not assembled from another viewing angle.

[0026] Description of reference numerals:

[0027] 1-box; 2-cell assembly; 21-bracket; 22-cell; 221-injection end; 3-upper cover; 31-mounting block; 4-BMS board; 5-pole; 6-bus; 7-explosion-proof valve;

[0028] 8-protective part; 81-U-shaped plate; 82-notch plate; 821-avoidance notch. DETAILED DESCRIPTION

[0029] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0030] Any feature disclosed in this specification, unless otherwise stated, may be replaced by other equivalent or alternative features having similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features. Throughout the specification, the same reference numerals indicate the same elements.

[0031] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, the technical solutions of the present invention are further explained below with reference to the accompanying drawings and through specific implementation methods.

[0032] In this embodiment, a battery module is proposed, which can improve the thermal runaway safety while ensuring that the entire battery module has a good compact structure and occupies a small area. In this embodiment, the battery module is specifically a 12V cylindrical battery module.

[0033] Specifically, Figure 1 and Figure 2As shown, the battery module includes a box body 1, a battery cell assembly 2, an upper cover 3 and a BMS board 4. The battery cell assembly 2 is arranged in the box body 1, and the BMS board 4 is installed in the upper cover 3. An opening is provided on the box body 1, and the upper cover 3 is provided at the opening so that the battery cell assembly 2 and the BMS board 4 can be encapsulated in the box body 1; the battery cell assembly 2 includes a bracket 21 and a battery cell 22 arranged in the bracket 21, and the BMS board 4 is horizontally placed on the bracket 21, and the BMS board 4 is electrically connected to the battery cell 22. The BMS board 4 and the battery cell 22 in this embodiment are both common structures in existing battery modules, and their working principles are not described in detail here. Among them, the BMS board 4 is connected to the upper cover 3 by fasteners. In this embodiment, the fasteners can specifically be bolts.

[0034] Furthermore, if Figures 2 to 5 As shown, the battery module also includes a protective member 8, the battery cell 22 is ejected toward the outer side of the protective member 8, the protective member 8 is connected to the upper cover 3, the protective member 8 is arranged around the outer side of the BMS board 4, and the protective member 8 abuts against the bracket 21, so that the BMS board 4 and the battery cell 22 can be separated by the abutting bracket 21 and the upper cover 3. In this embodiment, the battery cell 22 is specifically a cylindrical battery cell, and the cylindrical battery cell is horizontally placed in the box body 1.

[0035] Compared with the prior art, the battery module in this embodiment changes the physical separation structure between the BMS board 4 and the battery cell 22; the BMS board 4 is installed in the upper cover 3 and horizontally located on the bracket 21 of the battery cell assembly 2, and then a protective member 8 is arranged in the upper cover 3, and the battery cell 22 is sprayed toward the outer side of the protective member 8, so that the protective member 8 is arranged around the outer side of the BMS board 4 and abuts against the bracket 21, so that the BMS board 4 and the battery cell 22 can be completely separated by the protective member 8 and the bracket 21; when the battery cell 22 has thermal runaway and generates high-temperature and high-pressure gas, the generated gas will not be sprayed due to the isolation effect of the bracket 21 and the protective member 8. To the BMS board 4, ensure that the BMS board 4 is not damaged, so that the BMS board 4 can report the thermal runaway alarm signal in time, buy a certain amount of time for escape, and thus improve the safety during thermal runaway; at the same time, the heat generated by the BMS board 4 during operation will not flow to the battery cell 22, avoiding the battery cell 22 from being heated, so as to better protect the battery cell 22, thereby increasing the service life of the battery cell 22; a protective member 8 is provided between the bracket 21 of the battery cell assembly 2 and the upper cover 3. Compared with directly providing two separated cavities in the box body 1, a larger volume of the box body 1 is not required, so that the structure of the entire box body 1 occupies a smaller area and has a better compact structure.

[0036] Specifically, the protective member 8 and the upper cover 3 are an integrally formed structure, that is, the protective member 8 and the upper cover 3 are integrally injection molded, which, on the one hand, makes the processing simpler and more convenient, and does not require the protective member 8 and the upper cover 3 to be assembled additionally, saving time and effort; on the other hand, it can ensure the sealing between the protective member 8 and the upper cover 3, and ensure that the heat generated by the operation of the BMS board 4 and the high-temperature and high-pressure gas generated by the thermal runaway of the battery cell 22 will not flow out or flow in through the gap between the upper cover 3 and the protective member 8, which can better ensure the separation effect between the BMS board 4 and the battery cell 22. In other embodiments, the upper cover 3 and the protective member 8 can also be a split structure, which is not specifically limited here.

[0037] It is worth noting that since the upper cover 3 is usually made of plastic material, the protective member 8 which is an integrally formed structure with the upper cover 3 is also made of plastic material. When heat or high-temperature and high-pressure gas flows to the protective member 8, it is easy to melt the protective member 8 quickly in a short period of time and damage the BMS board 4, resulting in the BMS board 4 inside the protective member 8 being unable to promptly report a thermal runaway alarm signal.

[0038] In order to solve the above problems, in this embodiment, the upper cover 3 and the protective member 8 are made of PA66 plus 30% GF by integral injection molding, so that the melting point of the upper cover 3 and the protective member 8 is higher, the melting point is 200℃-220℃, so that the time from the occurrence of thermal runaway to the melting of the protective member 8 can be extended (10s-12s), so that the protective member 8 will not melt until a longer period of time, which can provide time for the BMS board inside the protective member 8 to report a thermal runaway alarm signal. Among them, PA66 is the full name of polyamide 66 or nylon 66, which is a thermoplastic resin material, and GF is the abbreviation of glass fiber, which is an inorganic non-metallic material with excellent performance.

[0039] Furthermore, if Figure 2 As shown, a plurality of spaced-apart battery cells 22 are arranged in the bracket 21, and an arc-shaped groove for accommodating the battery cells 22 is provided in the box body 1, that is, the upper and lower ends of the battery cells 22 are respectively installed in the bracket 21 and the arc-shaped groove, so as to ensure the installation stability and reliability of the battery cells 22 in the box body 1. In this embodiment, four battery cells 22 are arranged in the box body 1.

[0040] Specifically, in order to save the space in the box 1 and make the whole battery module more compact, Figure 2 and Figure 3As shown, the protective member 8 is directly abutted against the bracket 21, that is, the outer side surface of the protective member 8 is flush with the outer side surface of the bracket 21, the battery cell 22 is perpendicular to the outer side surface of the bracket 21, and a notch for exposing the injection end 221 of the battery cell 22 is provided on the outer side surface of the bracket 21, that is, the explosion-proof structure of the battery cell 22 is arranged corresponding to the notch, so that the injection end 221 of the battery cell 22 is sprayed outward toward the outer side surface of the protective member 8, so as to ensure that the protective member 8 can block the high-temperature and high-pressure gas ejected from the injection end 221 of the battery cell 22.

[0041] Furthermore, if Figures 2 to 5 As shown, the protective member 8 includes a U-shaped plate 81 and a notch plate 82, the notch plate 82 is located at the opening side of the U-shaped plate 81, and the U-shaped plate 81 and the notch plate 82 are both directly abutted against the bracket 21, so that the BMS board 4 can be surrounded by the U-shaped plate 81 and the notch plate 82 on the inner side of the protective member 8, thereby separating the battery cell 22 from the BMS board 4. The outer side surface of the U-shaped plate 81 is flush with the outer side surface of the bracket 21.

[0042] It is worth noting that making the outer side surface of the U-shaped plate 81 flush with the outer side surface of the bracket 21, relative to making the outer side surface of the U-shaped plate 81 protrude outward from the outer side surface of the bracket 21, can ensure that the injection end 221 of the battery cell 22 sprays outward toward the outer side surface of the U-shaped plate 81, thereby increasing the path for the gas ejected from the injection end 221 to reach the U-shaped plate 81, and further providing more time for the protective member 8 to protect the BMS board 4, so as to buy more time for escape.

[0043] Specifically, if Figures 3 to 5 As shown, an avoidance notch 821 is provided on the notch plate 82 to provide an avoidance space for the mounting block 31 on the upper cover 3, that is, the mounting block 31 is located at the avoidance notch 821, so that the mounting block 31 will not interfere with the notch plate 82; the mounting block 31 is used to install the pole 5, one end of the pole 5 is electrically connected to the BMS board 4, and the other end of the pole 5 extends out of the top of the upper cover 3.

[0044] Specifically, Figures 1 to 3 As shown, an explosion-proof valve 7 is provided on the box body 1, so that the high-temperature and high-pressure gas generated by the thermal runaway of the battery cell 22 can be discharged to the outside of the box body 1 through the explosion-proof valve 7 to ensure the safety of thermal runaway; and the explosion-proof valve 7, the notch plate 82 and an injection end 221 of the battery cell 22 are located on the same side of the box body 1.

[0045] By arranging the explosion-proof valve 7, the notch plate 82 and an injection end 221 of the battery cell 22 on the same side of the box body 1, when the injection end 221 of the battery cell 22 sprays gas due to thermal runaway, a large amount of gas will be directly sprayed out from the explosion-proof valve 7, and a large amount of gas will not be sprayed from the avoidance notch 821 of the notch plate 82 to the BMS board 4, thereby ensuring the isolation and protection effect of the notch plate 82 on the BMS board.

[0046] It is worth noting that if Figure 3 As shown, a U-shaped plate 81 is provided at the other injection end 221 of the battery cell 22 , so that the gas ejected from the injection end 221 can be isolated by the U-shaped plate 81 , thereby ensuring the protection effect on the BMS board 4 .

[0047] Furthermore, the connection between the pole 5 and the BMS board 4 is sealed by a sealant to avoid a gap at the connection between the pole 5 and the BMS board 4; the upper cover 3 and the box body 1 are sealed by a sealant, and the connecting wire connected to the BMS board 4 is sealed and passed through the bracket 21, that is, a sealant is provided between the connecting wire and the bracket 21, so that the entire battery module can be sealed and connected, avoiding the heat generated by the BMS board 4 and the high-temperature and high-pressure gas generated by the thermal runaway of the battery cell 22 from running around, thereby better protecting the BMS board 4 and the battery cell 22.

[0048] Furthermore, if Figure 2 As shown, the battery module also includes a bus 6, one end of the bus 6 is electrically connected to the BMS board 4, and the other end of the bus 6 is electrically connected to the battery cell 22, that is, the current of the battery cell 22 is sequentially conducted through the bus 6, the BMS board 4 and the pole 5 to the outside of the battery module for use.

[0049] The battery module in this embodiment, through the action of the protective member 8 and the bracket 21, can, on the one hand, isolate the thermal runaway gas of the battery cell 22 from the BMS board 4, ensuring that the BMS board 4 is not damaged so as to promptly report the thermal runaway alarm signal and buy time for escape; on the other hand, it can isolate the heat generated by the operation of the BMS board 4 to prevent the lower battery cell 22 from being heated, thereby improving the service life and performance of the battery cell 22.

[0050] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A battery module, comprising a box (1), a battery cell assembly (2), an upper cover (3) and a BMS board (4), wherein the battery cell assembly (2) is arranged in the box (1), and the BMS board (4) is installed in the upper cover (3); an opening is provided on the box (1), and the upper cover (3) is covered on the opening; the battery cell assembly (2) comprises a bracket (21) and a battery cell (22) arranged in the bracket (21), and the BMS board (4) is located on the bracket (21) and is electrically connected to the battery cell (22), characterized in that: The battery module also includes: A protective member (8) is connected to the inside of the upper cover (3), and the battery cell (22) is ejected toward the outer side of the protective member (8). The protective member (8) is arranged around the outer side of the BMS board (4) and abuts against the bracket (21) to separate the BMS board (4) and the battery cell (22).

2. The battery module according to claim 1, characterized in that: The protective member (8) and the upper cover (3) are an integrally formed structure.

3. The battery module according to claim 2, characterized in that: The melting point of the protective element (8) is 200°C-220°C.

4. The battery module according to any one of claims 1 to 3, characterized in that: The outer side surface of the protective member (8) is flush with the outer side surface of the bracket (21); a notch for exposing the injection end (221) of the battery cell (22) is provided on the outer side surface of the bracket (21); and the explosion-proof structure of the battery cell (22) is arranged corresponding to the notch.

5. The battery module according to any one of claims 1 to 3, characterized in that: The protective element (8) comprises: A U-shaped plate (81) and a notch plate (82), wherein the notch plate (82) is located at the opening side of the U-shaped plate (81), an avoidance notch (821) is provided on the notch plate (82), and the U-shaped plate (81) and the notch plate (82) are both in contact with the bracket (21).

6. The battery module according to claim 5, characterized in that: An explosion-proof valve (7) is provided on the box body (1); the explosion-proof valve (7), the notch plate (82) and the injection end (221) of the battery cell (22) are located on the same side of the box body (1).

7. The battery module according to claim 5, characterized in that: The upper cover (3) is also provided with a mounting block (31), the mounting block (31) being used to mount a pole (5), the pole (5) being electrically connected to the BMS board (4), and the mounting block (31) being located at the avoidance notch (821).

8. The battery module according to claim 7, characterized in that: The connection between the pole (5) and the BMS board (4) is sealed.

9. The battery module according to any one of claims 1 to 3, characterized in that: The upper cover (3) is sealedly connected to the box body (1), and the connecting wire connected to the BMS board (4) passes through the bracket (21) in a sealed manner.

10. The battery module according to any one of claims 1 to 3, characterized in that: The battery module also includes: A busbar (6), one end of the busbar (6) is electrically connected to the BMS board (4), and the other end of the busbar (6) is electrically connected to the battery cell (22).

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