Battery module and battery

Abstract

The battery module comprises a monomer group, the monomer group comprises a plurality of battery monomers arranged side by side along a first direction, the monomer group is provided with a first surface and a second surface, the first surface is positioned on one side of the first direction, and the second surface is positioned on two sides of the first direction and is adjacent to the first surface, a pressure relief piece is arranged at the end part, positioned on the first surface, of each battery monomer; the first heat insulation plate covers the first surface and is provided with a weak part, the weak part and the pressure relief piece are correspondingly arranged, and the first heat insulation plate is configured to deform to form an opening when bearing a set pressure value; and the second heat insulation plate covers the second surface and is connected with the first heat insulation plate. According to the utility model, the protection area of the monomer group can be enlarged, a more comprehensive protection effect is achieved, the heat insulation performance of the battery module is improved, the probability of potential safety hazards caused by thermal runaway of the battery module is reduced, and the reliability of the battery module is improved.

Description

Technical Field

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

[0002] In the related art, a battery module is composed of a plurality of battery cells. An explosion-proof valve is arranged at the top of the battery cell. The explosion-proof valve can exhaust and relieve pressure when the internal air pressure of the battery cell is relatively large, and spray out high-temperature contents. To avoid thermal spread under thermal runaway, generally, a heat insulation plate is arranged at the top of the battery module to block the high-temperature contents from the battery cells. However, the protection area of the above heat insulation and protection structure is relatively small, and there is still a high probability that the sprayed high-temperature contents will spread to the space where other battery cells are located, thereby affecting the overall reliability of the battery module. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide a battery module, which can achieve more comprehensive heat insulation protection, improve the overall heat insulation protection performance of the battery module, effectively relieve the thermal spread during thermal runaway, and improve the reliability of the battery module.

[0004] The utility model also aims to provide a battery to apply the above battery module.

[0005] According to an embodiment of the utility model, the battery module includes: a monomer group, the monomer group includes a plurality of battery cells arranged side by side in a first direction, the monomer group has a first surface and a second surface, the first surface is located on one side of the first direction, and the second surface is located on both sides of the first direction and adjacent to the first surface. Wherein, a pressure relief member is arranged at the end of each battery cell located on the first surface; a first heat insulation plate, the first heat insulation plate covers the first surface and is provided with a weak part, the weak part and the pressure relief member are correspondingly arranged and are configured to be deformable to form an opening when receiving a set pressure value; a second heat insulation plate, the second heat insulation plate covers the second surface and is connected to the first heat insulation plate.

[0006] According to the battery module of the embodiment of the utility model, by arranging the first heat insulation plate to cover the first surface of the monomer group, the second heat insulation plate to cover the second surface of the monomer group, and the first heat insulation plate to be provided with the weak part, the weak part corresponding to the pressure relief member of the battery cell, the protection area of the monomer group can be increased, a more comprehensive protection effect can be achieved, the heat insulation performance of the battery module can be improved, the probability of potential safety hazards caused by thermal runaway of the battery module can be reduced, the reliability of the battery module can be improved, and the battery module can more easily pass the battery thermal spread experiment. Moreover, the first heat insulation plate and the second heat insulation plate are used for heat insulation protection, and the structure is relatively simple, which can reduce the material cost and the assembly cost and lower the production cost.

[0007] In some embodiments of the present utility model, the weak part includes a weak plate and a connecting part. A first gap is formed between the peripheral side of the weak plate and the first heat insulation plate. The connecting part is located in the first gap and connects the weak plate and the first heat insulation plate.

[0008] In some embodiments of the present utility model, the length of the connecting part between the weak plate and the first heat insulation plate is 2 mm to 4 mm.

[0009] In some embodiments of the present utility model, the weak plate includes a first plate body and a second plate body. The first plate body and the second plate body are arranged at intervals, and a second gap is formed therebetween. Both the first plate body and the second plate body are connected to the first heat insulation plate through the connecting part.

[0010] In some embodiments of the present utility model, a cylindrical part is provided on the side of the first heat insulation plate away from the monomer group. The cylindrical part and the pressure relief part are arranged corresponding to each other. The weak part is located inside the cylindrical part.

[0011] In some embodiments of the present utility model, one of the first heat insulation plate and the second heat insulation plate is provided with a protruding part, and the other is provided with an embedding groove. The protruding part and the embedding groove can be nested and matched.

[0012] In some embodiments of the present utility model, the monomer group further has a third surface, and the third surface is located at both ends in the first direction. The battery module further includes a third heat insulation plate, and the third heat insulation plate covers the third surface and is connected to the first heat insulation plate and the second heat insulation plate.

[0013] In some embodiments of the present utility model, the first heat insulation plate, the second heat insulation plate, and the third heat insulation plate are at least one of mica material parts, aerogel material parts, and ceramic material parts.

[0014] In some embodiments of the present utility model, the first surface is the top surface of the monomer group.

[0015] The battery according to the embodiment of the present utility model includes: a box body; the battery module according to the foregoing, and the battery module is arranged in the box body.

[0016] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0018] Figure 1 is a schematic structural diagram of a battery module provided by an embodiment of the present utility model;

[0019] Figure 2 is a three-dimensional structural schematic diagram of a first heat insulation plate provided by an embodiment of the present utility model Figure 1 ;

[0020] Figure 3 is Figure 2 a partial enlarged schematic diagram at III;

[0021] Figure 4 is a three-dimensional structural schematic diagram of a first heat insulation plate provided by an embodiment of the present utility model Figure 2 ;

[0022] Figure 5 is a three-dimensional structural schematic diagram of a first heat insulation plate provided by an embodiment of the present utility model Figure 3 ;

[0023] Figure 6 is a schematic diagram of the cooperation between a first heat insulation plate and a second heat insulation plate provided by an embodiment of the present utility model;

[0024] Figure 7 is an explosion decomposition diagram of a battery provided by an embodiment of the present utility model.

[0025] Reference numerals:

[0026] 1000, battery;

[0027] 100, battery module; 10, monomer group; 10a, first surface; 10b, second surface; 10c, third surface; 11, battery cell; 12, pressure relief member; 20, first heat insulation plate; 20b, first gap; 20c, second gap; 21, weak part; 211, weak plate; 2111, first plate body; 2112, second plate body; 212, connecting part; 22, cylindrical part; 23, convex part; 30, second heat insulation plate; 31, embedding groove; 40, third heat insulation plate; 50, end plate; 60, tie strap;

[0028] 200, box body; 210, box main body; 220, box cover. Detailed implementation manners

[0029] The embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0030] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0031] In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features, which are used to distinguish and describe features, without order or importance. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more. In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] Next, with reference to Figures 1-7 , the battery module 100 according to an embodiment of the present utility model will be described.

[0033] As Figure 1 shown, the battery module 100 according to an embodiment of the present utility model includes: a monomer group 10, a first heat insulation plate 20, and a second heat insulation plate 30.

[0034] The monomer group 10 includes a plurality of battery monomers 11 arranged side by side in a first direction. The monomer group 10 has a first surface 10a and a second surface 10b. The first surface 10a is located on one side of the first direction, and the second surface 10b is located on both sides of the first direction and is adjacent to the first surface 10a. Among them, a pressure relief member 12 is provided at the end of each battery monomer 11 located on the first surface 10a.

[0035] The "first direction" may refer to the direction in which the plurality of battery monomers 11 are arranged. For example, the first direction may be one of the front-rear direction, left-right direction, or up-down direction of the battery module 100, and no specific limitation is made here. Exemplarily, with reference to Figure 1 , the first direction may be the left-right direction of the battery module 100.

[0036] The first surface 10a and the second surface 10b may refer to the outer contour surfaces of the monomer group 10. The first surface 10a may be one of the top surface, bottom surface, front side surface, rear side surface, left side surface, and right side surface of the monomer group 10. The second surface 10b can be determined according to its relative position with the first surface 10a, and no specific limitation is made here. Exemplarily, referring to Figure 1 , the first surface 10a may be the top surface of the monomer group 10, and the second surface 10b may be the front side surface and the rear side surface of the monomer group 10.

[0037] The pressure relief member 12 may refer to a component on the battery cell 11 that can exhaust gas and relieve pressure. For example, the pressure relief member 12 is an explosion-proof valve, which can relieve pressure when the internal pressure of the battery cell 11 reaches a set pressure value to ensure the safety of the battery cell 11. "Each battery cell 11 is provided with a pressure relief member 12 at the end of the first surface 10a" can be understood as that the pressure relief members 12 of multiple battery cells 11 are all located on the first surface 10a. Referring to the previous text, according to the different setting positions of the first surface 10a, the monomer group 10 can achieve exhaust gas and pressure relief at the top, bottom, or side, and no specific limitation is made here. Exemplarily, referring to Figure 1 , the first surface 10a may be the top surface of the monomer group 10, and the pressure relief member 12 is provided at the top of the battery cell 11, so that exhaust gas and pressure relief can be achieved at the top.

[0038] The first heat insulation plate 20 covers the first surface 10a and is provided with a weak part 21. The weak part 21 is correspondingly arranged with the pressure relief member 12 and is configured to be deformable to form an opening when subjected to a set pressure value. It can be understood that the first heat insulation plate 20 may refer to a plate member that can play a role in heat insulation. In this embodiment, the first heat insulation plate 20 can play a heat insulation and protection role on the first surface 10a of the monomer group 10. When thermal runaway occurs and high-temperature contents are ejected, the first heat insulation plate 20 can effectively prevent the high-temperature contents from invading the first surface 10a. The weak part 21 may refer to a part with relatively low strength in the first heat insulation plate 20. The weak part 21 is more likely to deform due to external force than other parts of the first heat insulation plate 20. In this embodiment, the weak part 21 may include, but is not limited to, a region with a relatively thin thickness, a region with a notch, and a thin film covering a hole after the hole is dug in the first heat insulation plate 20, etc.

[0039] The weak parts 21 of the first heat insulation plate 20 can be provided in multiple numbers, and the multiple weak parts 21 and the pressure relief parts 12 of the multiple battery cells 11 are provided in one-to-one correspondence. When one or more of the multiple battery cells 11 undergo thermal runaway, the pressure relief parts 12 are triggered to deform, and the high-temperature contents in the battery cells 11 spray outwards from the pressure relief parts 12. The sprayed high-temperature contents can act on the corresponding weak parts 21. Due to the relatively large impact force when the high-temperature contents are sprayed out, the structure of the weak parts 21 can be easily damaged, causing the weak parts 21 to deform and form openings, so that the high-temperature contents can spray out from the openings. Since the first heat insulation plate 20 can play a heat insulation role on the first surface 10a of the cell group 10, it is possible to prevent the high-temperature contents from invading the space where other battery cells 11 that have not undergone thermal runaway are located, and effectively prevent heat spread.

[0040] In addition, since the weak parts 21 are provided at the positions of the first heat insulation plate 20 corresponding to the pressure relief parts 12, when some of the battery cells 11 undergo thermal runaway, for the battery cells 11 that have not undergone thermal runaway, the weak parts 21 can play a heat insulation and protection role on the pressure relief parts 12 of the battery cells 11 that have not undergone thermal runaway, preventing the high-temperature contents from invading the space where the battery cells 11 are located from the positions where the pressure relief parts 12 are located. Thereby, the protection area of the battery cells 11 can be increased, making the heat insulation and protection of the first heat insulation plate 20 for the battery cells 11 more comprehensive, further enhancing the heat insulation and protection effect, and effectively preventing heat spread.

[0041] The second heat insulation plate 30 covers the second surface 10b and is connected to the first heat insulation plate 20. Referring to the foregoing, the second heat insulation plate 30 can also be a plate member that can play a role in insulating heat. When thermal runaway occurs, since the second surface 10b is close to the first surface 10a, the probability of the high-temperature contents spreading to the position where the second surface 10b is located is relatively high. Therefore, by covering the second surface 10b with the second heat insulation plate 30, it is possible to play a heat insulation and protection role on the second surface 10b adjacent to the first surface 10a, further increasing the protection area of the cell group 10 and making the range of heat insulation and protection wider. Moreover, since the second surface 10b is located on both sides in the first direction, the second surface 10b is formed by splicing small surfaces of multiple battery cells 11. Therefore, the second heat insulation plate 30 can protect more battery cells 11. That is to say, through the combined cooperation of the second heat insulation plate 30 and the first heat insulation plate 20, a more comprehensive protection effect can be achieved on the cell group 10, and the heat spread situation can be better inhibited.

[0042] According to the battery module 100 of the embodiments of the present utility model, by arranging the first heat insulation plate 20 to cover the first surface 10a of the single cell group 10, and the second heat insulation plate 30 to cover the second surface 10b of the single cell group 10, and arranging a weak part 21 on the first heat insulation plate 20, the weak part 21 corresponding to the pressure relief part 12 of the battery cell 11, it is possible to increase the protection area of the single cell group 10, play a more comprehensive protection role, improve the heat insulation performance of the battery module 100, reduce the probability of safety hazards caused by thermal runaway of the battery module 100, improve the reliability of the battery module 100, and enable the battery module 100 to more easily pass the battery thermal propagation experiment. Moreover, by using the first heat insulation plate 20 and the second heat insulation plate 30 for heat insulation protection, the structure is relatively simple, which can reduce the material cost and assembly cost, and reduce the production cost.

[0043] In some embodiments of the present utility model, as Figure 2 and Figure 3 shown, the weak part 21 may include a weak plate 211 and a connecting part 212. A first gap 20b is formed between the peripheral side of the weak plate 211 and the first heat insulation plate 20, and the connecting part 212 is located in the first gap 20b and connects the weak plate 211 and the first heat insulation plate 20.

[0044] In the above solution, since a first gap 20b is formed between the peripheral side of the weak plate 211 and the first heat insulation plate 20, and the weak plate 211 is only connected to the first heat insulation plate 20 through the connecting part 212, the connection strength between the weak plate 211 and the first heat insulation plate 20 is relatively weak. When the weak plate 211 is subjected to a large impact force, the connecting part 212 can be more easily broken, and then the whole weak part 21 deforms, the weak plate 211 turns up and opens on the first heat insulation plate 20, and an opening is formed on the first heat insulation plate 20, so that the high-temperature content can smoothly spray out from the opening.

[0045] It can be understood that the weak part 21 adopts the above structure, the structure is relatively simple, the first heat insulation plate 20 can form the weak part 21 by cutting or punching, the manufacturing is relatively simple, the manufacturability is good, and it is beneficial to reduce the manufacturing cost.

[0046] In some embodiments of the present utility model, as Figure 3 shown, the length of the connecting part 212 between the weak plate 211 and the first heat insulation plate 20 is 2 mm to 4 mm.

[0047] The length of the connecting part 212 between the weak plate 211 and the first heat insulation plate 20 can be Figure 3 L in, L can be but not limited to 2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3.0 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, etc.

[0048] If the length L of the connecting part 212 is less than 2 mm, the length of the connecting part 212 is relatively short and the strength of the connecting part 212 is relatively high. The weak plate 211 needs to be subjected to a greater force to cause the connecting part 212 to break, which easily increases the probability of failure of the weak part 21 when the battery cell 11 undergoes thermal runaway. If the length L of the connecting part 212 is greater than 4 mm, the first gap 20b formed between the weak plate 211 and the first heat insulation plate 20 is relatively large. In this way, when the battery cell 11 undergoes thermal runaway, the probability that the high-temperature content invades the space where the pressure relief member 12 of the battery cell 11 that has not undergone thermal runaway is increased from the first gap 20b.

[0049] That is to say, by setting the length of the connecting part 212 between the weak plate 211 and the first heat insulation plate 20 in the range of 2 mm to 4 mm, the connecting part 212 can be made to have appropriate strength and is relatively easy to break. At the same time, the first gap 20b formed between the weak plate 211 and the first heat insulation plate 20 can be made relatively narrow, and it is not easy for the high-temperature content to spread from the first gap 20b to the pressure relief member 12 where the battery cell 11 is located. With the above structure, the weak part 21 can have good protection performance while ensuring functionality.

[0050] Optionally, the shape of the weak plate 211 can be, but is not limited to, circular, oval, square, and the like.

[0051] In some embodiments of the present invention, as Figure 3 and Figure 4 shown, the weak plate 211 may include a first plate body 2111 and a second plate body 2112. The first plate body 2111 and the second plate body 2112 are arranged at intervals, and a second gap 20c is formed therebetween. Both the first plate body 2111 and the second plate body 2112 are connected to the first heat insulation plate 20 through the connecting part 212.

[0052] In the above structure, a cantilever structure is formed between the first plate body 2111 and the first heat insulation plate 20 and between the second plate body 2112 and the first heat insulation plate 20. When impacted by high-temperature content, the connecting part 212 is more likely to break, and the first plate body 2111 and the second plate body 2112 can be turned open to both sides (see Figure 4 ), forming a relatively large opening on the first heat insulation plate 20, which is beneficial to reducing the blockage of the high-temperature content and enabling the high-temperature content to be ejected more smoothly. Moreover, compared with the method of using a single whole plate for the weak plate 211, by setting the weak plate 211 to include the first plate body 2111 and the second plate body 2112, and arranging the first plate body 2111 and the second plate body 2112 at intervals, the material can be reduced, the weight can be reduced, and the energy density of the battery module 100 can be improved.

[0053] Furthermore, compared with the weak plate 211 being a single piece of plate connected to the first heat insulation plate 20 through the connecting portion 212, if only one connecting portion 212 is provided on the weak plate 211, the connection between the weak plate 211 and the first heat insulation plate 20 is relatively fragile and prone to breakage during the assembly stage, affecting the functionality of the weak portion 21; if multiple connecting portions 212 are provided on the weak plate 211, it is easy to reduce the probability of the connecting portion 212 breaking when the high-temperature content ejects, which is also not conducive to realizing the functionality of the weak portion 21. Therefore, in the above solution, both the first plate body 2111 and the second plate body 2112 are connected to the first heat insulation plate 20 through one connecting portion 212, and the sizes of the first plate body 2111 and the second plate body 2112 are reduced, so that a relatively reliable structure can be formed with the first heat insulation plate 20, the risk of breakage during the assembly process can be reduced, and the position where the connecting portion 212 is located is prone to breakage when the high-temperature content ejects, ensuring the functionality of the weak portion 21.

[0054] Optionally, as Figure 3 shown, the first plate body 2111 and the second plate body 2112 are semi-circular plates. The circular holes and semi-circular plates have relatively high manufacturability, which is beneficial to reducing the manufacturing cost.

[0055] Optionally, as Figure 3 shown, the connecting portions 212 of the first plate body 2111 and the second plate body 2112 are symmetrically arranged. In this way, when the connecting portions 212 of the first plate body 2111 and the second plate body 2112 break, the first plate body 2111 and the second plate body 2112 can open in opposite directions, which can avoid interference between the first plate body 2111 and the second plate body 2112 and improve the success rate of opening the first plate body 2111 and the second plate body 2112.

[0056] In some embodiments of the present utility model, as Figure 5 shown, a cylindrical portion 22 is provided on the side of the first heat insulation plate 20 away from the monomer group 10. The cylindrical portion 22 and the pressure relief member 12 are correspondingly arranged, and the weak portion 21 is located inside the cylindrical portion 22.

[0057] The cylindrical portion 22 may refer to a hollow cylindrical component, which may be, but is not limited to, a cylindrical barrel, a square barrel, etc. In the above embodiment, the first heat insulation plate 20 may be provided with multiple cylindrical portions 22, and the multiple cylindrical portions 22 and the pressure relief members 12 of the multiple battery monomers 11 are correspondingly arranged, that is, the number of the cylindrical portions 22 and the weak portions 21 may be equal and arranged in one-to-one correspondence. Exemplarily, referring to Figure 5 , the cylindrical portion 22 is a circular barrel.

[0058] In the above technical solution, the cylindrical portion 22 can isolate the weak portion 21 from the rest of the first heat insulation plate 20. When the high-temperature content ejects and spreads around, the cylindrical portion 22 can block the high-temperature content from entering the weak portion 21 where the battery cell 11 that has not experienced thermal runaway is located, preventing the high-temperature content from invading the space where the battery cell 11 that has not experienced thermal runaway is located through the weak portion 21, preventing the occurrence of thermal spread, which is beneficial to improving the protection performance of the battery cell 11 and reducing the probability of potential safety hazards when the battery module 100 undergoes thermal runaway.

[0059] In some embodiments of the present utility model, as Figure 6 shown, one of the first heat insulation plate 20 and the second heat insulation plate 30 is provided with a protruding portion 23, and the other is provided with an embedding groove 31, and the protruding portion 23 and the embedding groove 31 can be nested and matched.

[0060] In the above embodiment, the first heat insulation plate 20 can be provided with the protruding portion 23, and the second heat insulation plate 30 is provided with the embedding groove 31 (see Figure 6 ); alternatively, the first heat insulation plate 20 can be provided with the embedding groove 31, and the second heat insulation plate 30 is provided with the protruding portion 23.

[0061] By adopting the nested connection method of the protruding portion 23 and the embedding groove 31 between the first heat insulation plate 20 and the second heat insulation plate 30, the connection between the first heat insulation plate 20 and the second heat insulation plate 30 is closer, which is beneficial to preventing the high-temperature content from invading the space where the battery cell 11 is located through the gap between the first heat insulation plate 20 and the second heat insulation plate 30, reducing the risk of potential safety hazards of the monomer group 10 during thermal runaway. Moreover, adopting the above method for the first heat insulation plate 20 and the second heat insulation plate 30 is beneficial to achieving detachable connection, and the connection method is relatively simple, easy to install or disassemble, and can reduce the assembly cost. Secondly, after the first heat insulation plate 20 and the second heat insulation plate 30 are connected to each other, it is beneficial to more firmly cover the first surface 10a and the second surface 10b of the monomer group 10, reducing the probability of loosening of the first heat insulation plate 20 and the second heat insulation plate 30 on the monomer group 10, and being beneficial to improving the protection reliability.

[0062] Optionally, the protruding portion 23 and the embedding groove 31 are provided in multiple along the length direction of the first heat insulation plate 20. By providing multiple protruding portions 23 and embedding grooves 31, it is beneficial to improve the connection reliability between the first heat insulation plate 20 and the second heat insulation plate 30.

[0063] In some embodiments of the present utility model, as Figure 1 shown, the monomer group 10 further has a third surface 10c, the third surface 10c is located at both ends in the first direction, and the battery module 100 further includes a third heat insulation plate 40, and the third heat insulation plate 40 covers the third surface 10c and is connected to the first heat insulation plate 20 and the second heat insulation plate 30.

[0064] Exemplarily, referring toFigure 1 , the first surface 10a is the top surface of the monomer group 10, the second surface 10b is the front and rear side surfaces of the monomer group 10, and the third surface 10c is the left and right side surfaces of the monomer group 10. Therefore, the first heat insulation plate 20 can provide heat insulation protection for the top surface of the monomer group 10, the second heat insulation plate 30 can provide heat insulation protection for the front and rear side surfaces of the monomer group 10, and the third heat insulation plate 40 can provide heat insulation protection for the left and right side surfaces of the monomer group 10. It can be seen that through the first heat insulation plate 20, the second heat insulation plate 30 and the third heat insulation plate 40, heat insulation protection can be achieved for the top and the surrounding (front side surface, rear side surface, left side surface and right side surface) of the monomer group 10, and the monomer group 10 can be better surrounded for protection, and more rigorous heat insulation protection can be carried out on the monomer group 10, effectively preventing heat spread and improving the safety of the monomer group 10.

[0065] It can be understood that due to the protection of the first heat insulation plate 20 and the second heat insulation plate 30 for the first surface 10a and the second surface 10b of the monomer group 10, on this basis, by setting the third heat insulation plate 40 to play a protective role for the third surface 10c of the monomer group 10, the heat insulation protection area of the monomer group 10 can be further increased, so that the protective effect of the monomer group 10 can be more comprehensive and the heat insulation performance of the battery module 100 can be improved.

[0066] In some embodiments of the present utility model, the first heat insulation plate 20, the second heat insulation plate 30 and the third heat insulation plate 40 are at least one of mica material parts, aerogel material parts and ceramic material parts.

[0067] In the above technical solution, the materials of the first heat insulation plate 20, the second heat insulation plate 30 and the third heat insulation plate 40 can be the same or different. Among them, any one of the first heat insulation plate 20, the second heat insulation plate 30 and the third heat insulation plate 40 can be one of mica material, aerogel material or ceramic material. Exemplarily, the first heat insulation plate 20, the second heat insulation plate 30 and the third heat insulation plate 40 can all be mica materials. Optionally, the mica material can specifically be phlogopite.

[0068] It can be understood that the above mica material parts can be, but are not limited to, muscovite, biotite or phlogopite, etc. Using mica material can withstand high temperatures above 500 degrees Celsius, and it is relatively brittle and has a relatively low cost, which is beneficial to reducing the material cost. The aerogel material has a better heat insulation effect, which is beneficial to improving the overall heat insulation performance, and thus is beneficial to making the monomer group 10 have higher safety when the battery cell 11 undergoes thermal runaway. The ceramic material parts have high heat resistance, stability, mechanical strength and wear resistance, and the manufacturing process is relatively mature, which is beneficial to improving the product yield rate during the assembly stage, and has a relatively high service life, and helps to control the material cost within a reasonable range.

[0069] In some embodiments of the present utility model, as Figure 1 shown, the battery module 100 further includes an end plate 50. The end plate 50 is provided on one side of the cell group 10 close to the third surface 10c and abuts against the third heat insulation plate 50. The end plate 50 is arranged on one side of two third surfaces 10c, which can play a role in structural support for a plurality of juxtaposed battery cells 11, firmly fix the battery cells 11 in the battery module 100, prevent the battery cells 11 from moving or shaking, and improve the overall structural stability of the battery module 100. Moreover, the end plate 50 can also provide connection terminals or wiring ports for connecting the electrical circuits of the battery module 100 to achieve the electrical connection between the battery module 100 and external devices or circuits.

[0070] In some embodiments of the present utility model, as Figure 1 shown, the battery module 100 further includes a cable tie 60. The cable tie 60 is arranged around the periphery of the battery module 100 and is tied to the end plate 50 and the second heat insulation plate 30. Through the cable tie 60, the end plate 50, the second heat insulation plate 30 and the cell group 10 can be firmly fixed, improving the overall reliability of the battery module 100.

[0071] In some embodiments of the present utility model, as Figure 1 shown, the first surface 10a is the top surface of the cell group 10.

[0072] It can be understood that the first surface 10a is the top surface of the cell group 10. That is to say, a pressure relief member 12 is arranged at the top of the battery cell 11. Since during the operation of the battery cell 11, the gas generated inside is usually concentrated at the top of the battery cell 11, arranging the pressure relief member 12 at the top of the battery cell 11 can release the internal pressure more directly and effectively. Moreover, the top of the battery cell 11 is usually a part with relatively high structural strength. By arranging the pressure relief member 12 at this position, when the pressure relief member 12 is activated, the battery cell 11 can withstand the impact brought by the pressure release and maintain the overall stability of the battery cell 11. Therefore, the first heat insulation plate 20 covers the top surface of the cell group 10, which can play a heat insulation and protection role on the top surface of the cell group 10 when the pressure relief member 12 discharges high-temperature content.

[0073] As Figure 7 shown, the battery 1000 according to an embodiment of the present utility model includes a battery module 100 and a box body 200. The battery module 100 is the battery module 100 in any of the previous embodiments, and the battery module 100 is arranged inside the box body 200.

[0074] According to the battery 1000 of the embodiment of the present utility model, since the battery module 100 has high heat insulation and protection performance, effectively prevents the occurrence of heat spread, can reduce the probability of safety hazards in the case of thermal runaway, and has higher safety. Therefore, when the battery 1000 undergoes thermal runaway, it can effectively relieve the heat spread situation, improve the overall safety of the battery 1000, and further improve the reliability of the battery 1000.

[0075] In some embodiments of the present utility model, as Figure 7 shown, the box body 200 includes a box main body 210 and a box cover 220. The box main body 210 has an accommodation space and a box body opening communicating with the accommodation space. The box cover 220 is covered on the box body opening, and the battery module 100 is arranged in the accommodation space. By this means, it is convenient to assemble the battery module 100 into the box body 200, which is beneficial to later disassembly and maintenance.

[0076] The other constitutions and operations of the battery 1000 according to the embodiment of the present utility model are known to those of ordinary skill in the art and will not be described in detail here.

[0077] In the description of this specification, the description with reference to terms such as "some embodiments", "optionally", "further", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0078] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery module, characterized in that: include: A cell group, the cell group comprising a plurality of battery cells arranged side by side along a first direction, the cell group having a first surface and a second surface, the first surface being located on one side of the first direction, the second surface being located on both sides of the first direction and adjacent to the first surface, wherein a pressure relief member is provided at an end of each battery cell located on the first surface; A first heat insulation board, the first heat insulation board covers the first surface and is provided with a weak portion, the weak portion and the pressure relief member are provided correspondingly, and is configured to be deformable to form an opening when subjected to a set pressure value; A second heat insulation board is covered on the second surface and connected to the first heat insulation board.

2. The battery module according to claim 1, characterized in that: The weak portion includes a weak plate and a connecting portion. A first gap is formed between the peripheral side of the weak plate and the first heat insulation plate. The connecting portion is located in the first gap and connects the weak plate and the first heat insulation plate.

3. The battery module according to claim 2, characterized in that: The length of the connecting portion between the weak plate and the first heat insulation plate is 2 mm to 4 mm.

4. The battery module according to claim 2, characterized in that: The weak plate includes a first plate body and a second plate body, the first plate body and the second plate body are spaced apart and a second gap is formed therebetween, and the first plate body and the second plate body are both connected to the first heat insulation plate via the connecting portion.

5. The battery module according to any one of claims 1 to 4, characterized in that: A cylindrical portion is provided on a side of the first heat insulation board away from the monomer group, the cylindrical portion and the pressure relief member are provided correspondingly, and the weak portion is located on the inner side of the cylindrical portion.

6. The battery module according to claim 1, characterized in that: One of the first heat insulation board and the second heat insulation board is provided with a protruding portion, and the other is provided with an embedding groove, and the protruding portion and the embedding groove can be nested and matched.

7. The battery module according to claim 1, characterized in that: The monomer group further has a third surface, and the third surface is located at two ends of the first direction. The battery module also includes a third insulation board, and the third insulation board covers the third surface and is connected to the first insulation board and the second insulation board.

8. The battery module according to claim 7, characterized in that: The first heat insulation board, the second heat insulation board and the third heat insulation board are made of at least one of mica material, aerogel material and ceramic material.

9. The battery module according to claim 1, characterized in that: The first surface is the top surface of the monomer group.

10. A battery, characterized in that: include: Box; The battery module according to any one of claims 1 to 9, wherein the battery module is disposed in the box.

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