Battery modules and battery packs containing them

Abstract

This utility model provides a battery module and a battery pack having the same. The battery module includes: a cell portion; and a separator assembly disposed on one side of the cell portion. The separator assembly includes a shell, ribs, multiple heat insulation portions, and a cover plate. The shell has a receiving space and an opening communicating with the receiving space. Multiple ribs are disposed within the receiving space, dividing the receiving space into multiple receiving cavities. Multiple heat insulation portions are disposed within the multiple receiving cavities. The cover plate covers the opening. The ratio of the sum of the projected areas S1 of the multiple heat insulation portions on the cover plate to the cross-sectional area S2 of the cover plate satisfies: 0.45 ≤ S1 / S2 ≤ 0.9. The technical solution of this application can effectively solve the problem of poor battery pack reliability in related technologies.

Description

Technical Field

[0001] This utility model relates to the field of chemical energy storage technology, and more specifically, to a battery module and a battery pack having the same. Background Technology

[0002] Currently, batteries, as a chemical energy storage structure, provide a stable and reliable energy source for various industries. Especially in the field of new energy vehicles, where technology has made leaps and bounds, power batteries, as the power source of electric vehicles, play a crucial role. Among these, batteries, as core components of new energy vehicles, have high requirements in terms of both performance and manufacturing quality.

[0003] In related fields, battery packs are an effective way to encapsulate energy storage structures. Among them, the battery cells are the basic structure for energy storage, and the temperature of the battery cells during operation directly affects the reliability of the battery pack. In addition, the battery pack also includes control components, which generate heat during operation. This heat can affect the operating temperature of the battery cells, thus posing potential risks to the battery pack. Utility Model Content

[0004] The main objective of this invention is to provide a battery module and a battery pack having the same, in order to solve the problem of poor reliability of battery packs in related technologies.

[0005] To achieve the above objectives, according to one aspect of the present invention, a battery module is provided, comprising: a battery cell portion; and a separator assembly disposed on one side of the battery cell portion. The separator assembly includes a shell, ribs, multiple heat insulation portions, and a cover plate. The shell has a receiving space and an opening communicating with the receiving space. Multiple ribs are disposed within the receiving space, and the multiple ribs divide the receiving space into multiple receiving cavities. Multiple heat insulation portions are disposed within the multiple receiving cavities, and the cover plate covers the opening. The ratio of the sum of the projected areas S1 of the multiple heat insulation portions on the cover plate to the cross-sectional area S2 of the cover plate satisfies: 0.45 ≤ S1 / S2 ≤ 0.9.

[0006] According to another aspect of the present invention, a battery pack is provided, including a battery module, wherein the battery module is the battery module described above.

[0007] Applying the technical solution of this utility model, the battery cell serves as an energy storage component, providing energy storage functionality for the battery module. A separator assembly is disposed on one side of the battery cell, serving both to limit its position and to isolate it from other components, thus limiting the impact of heat generated by other components on the battery cell and enabling it to operate stably at an ideal temperature. More specifically, the separator assembly includes a shell, ribs, multiple heat insulation sections, and a cover plate. The shell serves as the supporting base of the separator assembly, having an accommodating space and an opening communicating with it. The cover plate covers the opening to seal the accommodating space. Multiple ribs are disposed within the accommodating space, providing better insulation for the shell. The strong structural strength makes the separator assembly less prone to damage. Furthermore, multiple ribs divide the accommodating space into multiple cavities, providing installation space for multiple heat insulation components. The ratio of the sum of the projected areas S1 of the multiple heat insulation components on the cover plate to the cross-sectional area S2 of the cover plate 24 satisfies: 0.45 ≤ S1 / S2 ≤ 0.9. This design ensures that the ribs occupy sufficient area, thus providing sufficient structural strength to the separator assembly, and that the heat insulation components occupy sufficient area, thereby guaranteeing the heat insulation effect of the separator assembly and reducing the possibility of thermal runaway in the battery module. By balancing structural strength and heat insulation performance, the reliability of the battery module is comprehensively improved, resulting in a higher reliability. Therefore, the technical solution of this application can effectively solve the problem of poor battery pack reliability in related technologies. Attached Figure Description

[0008] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0009] Figure 1 A three-dimensional structural schematic diagram of a portion of the structure of a battery pack according to an embodiment of the present invention is shown;

[0010] Figure 2 It shows Figure 1 An enlarged view of point A on the battery pack;

[0011] Figure 3 It shows Figure 1 A schematic diagram of the separate structure of the battery pack separator assembly;

[0012] Figure 4 It shows Figure 1 A cross-sectional schematic diagram of a portion of the battery pack structure.

[0013] The above figures include the following reference numerals:

[0014] a) First preset direction; b) Second preset direction;

[0015] 10. Battery cell section; 11. Battery cell;

[0016] 20. Partition assembly; 21. Outer shell; 211. Base plate; 212. Side plate; 22. Rib; 221. First rib; 222. Second rib; 23. Heat insulation part; 231. Heat insulation block; 232. First heat insulation block; 233. Second heat insulation block; 234. Third heat insulation block; 24. Cover plate; 25. Receiving space; 251. Receiving cavity; 26. Mounting block; 261. Through hole; 31. Chassis; 32. Control assembly. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0018] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0019] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0020] like Figures 1 to 3As shown, this application provides a battery module. An embodiment of the battery module of this application includes: a cell portion 10 and a separator assembly 20; the separator assembly 20 is disposed on one side of the cell portion 10, and the separator assembly 20 includes a shell 21, ribs 22, a plurality of heat insulation portions 23 and a cover plate 24. The shell 21 has a receiving space 25 and an opening communicating with the receiving space 25. There are a plurality of ribs 22 disposed in the receiving space 25, and the plurality of ribs 22 divide the receiving space 25 into a plurality of receiving cavities 251. The plurality of heat insulation portions 23 are disposed in the plurality of receiving cavities 251, and the cover plate 24 covers the opening; wherein, the ratio of the sum of the projected areas S1 of the plurality of heat insulation portions 23 on the cover plate 24 to the cross-sectional area S2 of the cover plate 24 satisfies: 0.45≤S1 / S2≤0.9.

[0021] Applying the technical solution of this embodiment, the battery cell 10 serves as an energy storage component, providing energy storage functionality for the battery module. The separator assembly 20 is disposed on one side of the battery cell 10. The separator assembly 20 can limit the position of the battery cell 10 and also isolate it from other components, thus limiting the impact of heat generated by other components on the battery cell 10, allowing the battery cell 10 to operate stably at an ideal temperature. More specifically, the separator assembly 20 includes a shell 21, ribs 22, multiple heat insulation portions 23, and a cover plate 24. The shell 21 serves as the supporting base of the separator assembly 20, having a receiving space 25 and an opening communicating with the receiving space 25. The cover plate 24 covers the opening to close the receiving space 25. Multiple ribs 22 are disposed within the receiving space 25. On one hand, the ribs 22... The casing 21 provides stronger structural strength, making the separator assembly 20 less prone to damage. Furthermore, multiple ribs 22 divide the accommodating space 25 into multiple accommodating cavities 251, providing installation space for multiple heat-insulating parts 23. The ratio of the sum of the projected areas S1 of the multiple heat-insulating parts 23 on the cover plate 24 to the cross-sectional area S2 of the cover plate 24 satisfies: 0.45 ≤ S1 / S2 ≤ 0.9. This arrangement ensures that the ribs 22 occupy sufficient area, providing sufficient structural strength for the separator assembly 20, and that the heat-insulating parts 23 occupy sufficient area, guaranteeing the heat insulation effect of the separator assembly 20. This reduces the possibility of thermal runaway in the battery module. By balancing structural strength and heat insulation performance, the reliability of the battery module is comprehensively improved, resulting in higher reliability. Therefore, the technical solution of this embodiment effectively solves the problem of poor battery pack reliability in related technologies.

[0022] Specifically, in this embodiment, the ratio S1 / S2 of the sum of the projected areas S1 of the plurality of heat insulation parts 23 on the cover plate 24 to the cross-sectional area S2 of the cover plate 24 can be 0.45, 0.5, 0.68, 0.77, 0.8, 0.82, or 0.9. It should be noted that in this embodiment, the cross-sectional area S2 of the cover plate 24 is consistent, and the cross-sectional area S2 of the cover plate 24 is also consistent with the surface area of ​​the cover plate 24.

[0023] like Figure 1 as well as Figure 2 As shown, the plurality of ribs 22 include a plurality of first ribs 221 and a plurality of second ribs 222. The plurality of first ribs 221 are spaced apart along a first preset direction a, and the plurality of second ribs 222 are spaced apart along a second preset direction b. The first preset direction a and the second preset direction b are intersected. At least a portion of the first ribs 221 and at least a portion of the second ribs 222 are intersected, such that a plurality of receiving cavities 251 are formed between the first ribs 221 and the second ribs 222, or between the second ribs 222 and the outer shell 21, or between the first ribs 221 and the outer shell 21, to accommodate the heat insulation part 23. The operator can determine the layout of the heat insulation part 23 based on the relative layout relationship between the heat-generating components and the battery cell 10. It should be noted that "at least some of the first ribs 221 are intersected with at least some of the second ribs 222" means that each first rib 221 is intersected with all the second ribs 222, or each first rib 221 is intersected with some of the second ribs 222, or some of the first ribs 221 are intersected with some of the second ribs 222.

[0024] like Figures 1 to 3 As shown, the multiple heat insulation sections 23 include multiple heat insulation blocks 231, and the multiple heat insulation blocks 231 are arranged one-to-one with the multiple receiving cavities 251. The volume of the outermost heat insulation block 231 is larger than that of the innermost heat insulation block 231. Specifically, since there is a certain gap between the inner surface of the outer shell 21 and the partition assembly 20, heat transfer is more likely to occur here, making the volume of the outermost heat insulation block 231 larger than that of the innermost heat insulation block 231, thus making the heat insulation capacity of the outermost heat insulation block 231 stronger, and consequently improving the heat insulation capacity of the partition assembly 20. It should be noted that, as Figure 2 As shown, the first heat insulation block 232 is one or a part of the heat insulation block 231 located on the inner side, and the second heat insulation block 233 and the third heat insulation block 234 are one or a part of the heat insulation block 231 located on the outermost side.

[0025] like Figures 1 to 3As shown, the outer casing 21 has a cuboid structure. In the outermost heat insulation block 231, the volume of the heat insulation block 231 located at the corner of the outer casing 21 is larger than the volume of the heat insulation block 231 located on the side of the outer casing 21. Specifically, the gap between the corner of the outer casing 21 and the partition assembly 20 is larger than the gap between the side of the outer casing 21 and the partition assembly 20, making the volume of the heat insulation block 231 at the corner of the outer casing 21 larger than the volume of the heat insulation block 231 located on the side of the outer casing 21. This results in stronger heat insulation capability of the corner heat insulation block 231, and consequently, better heat insulation capability of the partition assembly 20. It should be noted that, as... Figure 2 As shown, in the outermost heat insulation block 231, the second heat insulation block 233 is one or a part of the heat insulation block 231 located at the corner of the outer shell 21, and the third heat insulation block 234 is one or a part of the heat insulation block 231 located on the side of the outer shell 21.

[0026] In some other embodiments, such as Figure 4 As shown, the outer casing 21 includes a base plate 211 and a side plate 212. Ribs 22 are disposed on the base plate 211. The partition assembly 20 also includes a mounting block 26, which has a through hole 261. The mounting block 26 is disposed within the receiving space 25. A first opening is provided on the base plate 211, and a second opening is provided on the cover plate 24. The first end of the through hole 261 communicates with the first opening, and the second end of the through hole 261 communicates with the second opening. Specifically, the mounting block 26 can also improve the structural strength of the outer casing 21. In addition, the first opening, the through hole 261, and the second opening are connected, allowing the base plate 211 and the cover plate 24 to communicate, thereby enabling wiring to be routed so that the battery cell 10 on one side of the partition assembly 20 can be electrically connected to other structures on the other side of the partition assembly 20. It also ensures that the through hole 261 does not have an excessive impact on the heat insulation effect of the partition assembly 20.

[0027] Furthermore, in this embodiment, the mounting block 26 is disposed at the intersection of one of the first ribs 221 and one of the second ribs 222. Specifically, placing the mounting block 26 at the intersection also ensures the structural strength of the outer casing 21.

[0028] like Figure 4 As shown, the surface of the mounting block 26 facing the cover plate 24 protrudes beyond the surface of the rib 22 facing the cover plate 24. Specifically, the heat insulation part 23 can be formed by filling the receiving cavity 251 with liquid material and waiting for the liquid material to solidify. Since the surface of the mounting block 26 facing the cover plate 24 protrudes beyond the surface of the rib 22 facing the cover plate 24, the liquid material will not overflow through the through hole 261 to other places beyond the surface of the mounting block 26 facing the cover plate 24, thus ensuring that the heat insulation part 23 is easier to form.

[0029] Furthermore, in this embodiment, the heat insulation part 23 is made of a gel material or a phase change material. Specifically, the heat insulation part can be made of aerogel and a porous fiber substrate. The aerogel can be an inorganic porous aerogel material such as silica, which has extremely low thermal conductivity and good heat resistance. The porous fiber substrate includes at least one of pre-oxidized fiber felt, glass fiber felt, and ceramic fiber felt.

[0030] [Battery Structure]

[0031] The battery cell in this application is a secondary battery, also known as a rechargeable battery or storage battery, which refers to a battery that can be used again after being discharged by recharging to activate the active materials.

[0032] Typically, a secondary battery includes an electrode assembly, an electrolyte, and an outer casing. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The electrode assembly and electrolyte are assembled inside the outer casing. During charging and discharging, active ions (such as lithium ions) move back and forth between the positive and negative electrodes, inserting and extracting. The separator, positioned between the positive and negative electrodes, primarily prevents short circuits while allowing active ions to pass through. The electrolyte, located between the positive and negative electrodes, mainly serves to conduct active ions.

[0033] As an example, the preparation process of a secondary battery is as follows: the positive electrode, separator, and negative electrode are stacked in sequence, with the separator acting as a separator between the positive and negative electrodes. Then, the electrodes are wound or stacked to obtain an electrode assembly. The electrode assembly is placed in an outer packaging shell, dried, and then injected with electrolyte. After vacuum sealing, settling, formation, and shaping, a secondary battery is obtained.

[0034] [Positive electrode tablets]

[0035] A positive electrode typically includes a positive current collector and a positive electrode film layer disposed on at least one side of the positive current collector. The positive electrode film layer includes a positive electrode active material, which can be any existing publicly disclosed positive electrode active material or a positive electrode active material optimized based on existing materials.

[0036] This application does not impose any particular restrictions on the type of positive electrode active material for the positive electrode sheet. As an example, the positive electrode active materials in this application include lithium-containing transition metal oxides (e.g., LiCoO2), phosphides (e.g., LiFePO4), or lithium intercalation compounds (e.g., positive electrode materials for binary lithium batteries such as lithium cobalt oxide and lithium nickel oxide, or positive electrode materials for ternary lithium batteries such as lithium nickel cobalt manganese oxide and lithium nickel cobalt aluminum oxide).

[0037] In some embodiments, the positive electrode sheet can be prepared by dispersing the above-mentioned components for preparing the positive electrode sheet, such as positive electrode active material, conductive agent, binder and any other components, in a solvent (e.g., N-methylpyrrolidone) to form a positive electrode slurry; coating the positive electrode slurry onto the positive electrode current collector, and then obtaining the positive electrode sheet after drying, rolling, cutting and other processes.

[0038] In this application, the binder is used to improve the adhesion between positive electrode active material particles and the adhesion between the positive electrode active material and the current collector. This application does not impose any particular limitation on the type of binder for the positive electrode sheet; the binder can be any conventional choice in the battery industry. Specifically, the binder can be at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyvinyl alcohol (PVA), styrene-butadiene rubber (SBR), polyacrylonitrile (PAN), polyimide (PI), polyacrylic acid (PAA), polyacrylate, polyolefin, sodium carboxymethyl cellulose (CMC), or sodium alginate.

[0039] This application does not impose any particular restrictions on the positive electrode current collector, as long as it is conductive and will not cause adverse chemical changes in the battery, and can be made of, for example: stainless steel, aluminum, nickel, titanium, sintered carbon; or aluminum or stainless steel that has been surface treated with one of carbon, nickel, titanium, silver, etc.

[0040] [Negative electrode plate]

[0041] The negative electrode includes a negative electrode current collector and a negative electrode active material layer disposed on at least one side of the negative electrode current collector. The negative electrode active material layer comprises a silicon-based material. This application does not specifically limit the type of silicon-based material; the silicon-based material can be a silicon-carbon material and / or a silicon-oxygen material. As an example, the silicon-based material can be one or more of silicon-carbon composite negative electrode materials, silicon suboxide negative electrode materials, modified silicon suboxide negative electrode materials, and nano-silicon materials. The negative electrode active material in the negative electrode active material layer may also optionally include one or more of artificial graphite, natural graphite, and hard carbon.

[0042] In some embodiments, the negative electrode sheet can be prepared by dispersing the components used to prepare the negative electrode sheet, such as the negative electrode active material, conductive agent, binder and any other components, in a solvent (e.g., water) to form a negative electrode slurry; coating the negative electrode slurry onto the negative electrode current collector, and then obtaining the negative electrode sheet after drying, rolling, cutting and other processes.

[0043] This application does not specifically limit the type of negative electrode conductive agent. In some embodiments, as an example, the negative electrode conductive agent can be one or more of conventional negative electrode conductive agents such as acetylene black and carbon nanotubes.

[0044] This application does not impose specific restrictions on the type of negative electrode binder. In some embodiments, as an example, the binder may be one or more of conventional negative electrode binders such as styrene-butadiene rubber latex (SBR), polyvinylidene fluoride (PVDF), polyacrylic acid (PAA), and sodium carboxymethyl cellulose (CMC). In this application, the binder is preferably PAA, SBR, and CMC, and the mass ratio of PAA, SBR, and CMC may be (34.38-74.29):(20-59.38):(5-7.14).

[0045] This application does not impose specific limitations on the type of negative electrode current collector. In some embodiments, as an example, the negative electrode current collector can be one of the conventional negative electrode current collectors such as copper foil.

[0046] Electrolyte

[0047] The electrolyte acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. As an example, the electrolyte in this application can be any electrolyte suitable for electrochemical energy storage devices in the art. The electrolyte includes an electrolyte and a solvent; the electrolyte typically includes a lithium salt, and additives may also be added to the electrolyte.

[0048] Specifically, the lithium salt includes at least one selected from lithium hexafluorophosphate (LiPF6), lithium tetrafluoroborate (LiBF4), lithium perchlorate (LiClO4), lithium hexafluoroarsenate (LiAsF6), lithium bis(fluorosulfonyl)imide (LiFSI), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium trifluoromethanesulfonate (LiTFS), lithium difluorooxalate borate (LiDFOB), lithium dioxalate borate (LiBOB), lithium difluorophosphate (LiPO2F2), lithium difluorodioxalate phosphate (LiDFOP), and lithium tetrafluorooxalate phosphate (LiTFOP). The concentration of the electrolyte in the electrolyte solution can be 0.5–5 mol / L.

[0049] Specifically, the solvent includes at least one of ethylene carbonate (EC), propylene carbonate (PC), methyl ethyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), butyl carbonate (BC), fluoroethylene carbonate (FEC), methyl formate (MF), methyl acetate (MA), ethyl acetate (EA), propyl acetate (PA), methyl propionate (MP), ethyl propionate (EP), propyl propionate (PP), methyl butyrate (MB), ethyl butyrate (EB), 1,4-butyrolactone (GBL), sulfolane (SF), dimethyl sulfone (MSM), methyl ethyl sulfone (EMS), and diethyl sulfone (ESE).

[0050] In some implementations, as an example, the additive may be a conventional electrolyte additive such as fluoroethylene carbonate (FEC), chloroethylene carbonate (CEC), or vinylene carbonate (VC).

[0051] [Septum]

[0052] In some embodiments, the secondary battery also includes a separator. This application does not impose any particular limitation on the type of separator; any known porous separator with good chemical and mechanical stability can be selected.

[0053] In some embodiments, as an example, the diaphragm can be one of PP, PE, or PP / PF; the diaphragm can also be a structure in which a coating is formed on the surface of the base film, wherein the base film coating can be one of PP, PE, or PP / PF, and the coating can be an inorganic coating and / or an organic coating. The inorganic coating can be selected from alumina ceramic layers, osmium silicate, etc., and the organic coating can be selected from PVDF, etc.

[0054] This application also provides a battery pack, which includes a battery module, wherein the battery module is the aforementioned battery module. The aforementioned battery module can effectively solve the problem of poor reliability in related technologies, and the battery pack having the aforementioned battery module also has the aforementioned advantages.

[0055] like Figure 1 As shown, the battery pack includes a chassis 31 and a control assembly 32. Both the control assembly 32 and the battery modules are mounted on the chassis 31. The separator assembly 20 of the battery modules is disposed between the control assembly 32 and the battery cell section 10 of the battery modules. Specifically, the chassis 31 is used to support the various components of the battery pack. The control assembly 32 may include a processing module, an information collection module, etc. The separator assembly 20 is disposed between the control assembly 32 and the battery cell section 10 to prevent the heat generated by the control assembly 32 during operation from adversely affecting the operation of the battery cell section 10.

[0056] like Figure 1 As shown, the battery cell section 10 includes a plurality of battery cells 11, which are stacked together. A separator assembly 20 is disposed outside the outermost battery cell 11. The separator assembly 20 can also limit the outermost battery cell 11, thereby keeping the plurality of battery cells 11 in a stacked state.

[0057] In the description of this utility model, it should be understood that "multiple" means two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0058] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0059] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0060] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery module, characterized by, include: Battery cell section (10); A separator assembly (20) is disposed on one side of the cell section (10). The separator assembly (20) includes a housing (21), ribs (22), multiple heat insulation parts (23), and a cover plate (24). The housing (21) has a receiving space (25) and an opening communicating with the receiving space (25). Multiple ribs (22) are disposed within the receiving space (25), and the multiple ribs (22) divide the receiving space (25) into multiple receiving cavities (251). Multiple heat insulation parts (23) are disposed within the multiple receiving cavities (251), and the cover plate (24) covers the opening. The ratio of the sum of the projected areas S1 of the plurality of heat insulation parts (23) on the cover plate (24) to the cross-sectional area S2 of the cover plate (24) satisfies: 0.45≤S1 / S2≤0.

9.

2. The battery module of claim 1, wherein, The plurality of ribs (22) include a plurality of first ribs (221) and a plurality of second ribs (222). The plurality of first ribs (221) are spaced apart along a first preset direction (a), and the plurality of second ribs (222) are spaced apart along a second preset direction (b). The first preset direction (a) and the second preset direction (b) are intersected. At least some of the first ribs (221) and at least some of the second ribs (222) are intersected.

3. The battery module of claim 2, wherein, The plurality of heat insulation parts (23) include a plurality of heat insulation blocks (231), and the plurality of heat insulation blocks (231) are arranged in a one-to-one correspondence with the plurality of receiving cavities (251). The volume of the outermost heat insulation block (231) is larger than the volume of the inner heat insulation block (231).

4. The battery module according to claim 3, characterized in that, The outer shell (21) has a cuboid structure. Among the outermost heat insulation blocks (231), the volume of the heat insulation block (231) located at the corner of the outer shell (21) is greater than the volume of the heat insulation block (231) located on the side of the outer shell (21).

5. The battery module of any one of claims 2 to 4, wherein, The outer shell (21) includes a base plate (211) and a side plate (212). The rib (22) is disposed on the base plate (211). The partition assembly (20) also includes a mounting block (26). The mounting block (26) has a through hole (261). The mounting block (26) is disposed in the receiving space (25). The base plate (211) is provided with a first opening. The cover plate (24) is provided with a second opening. The first end of the through hole (261) communicates with the first opening. The second end of the through hole (261) communicates with the second opening.

6. The battery module of claim 5, wherein, The mounting block (26) is disposed at the intersection of one of the first ribs (221) and one of the second ribs (222).

7. The battery module of claim 5, wherein, The surface of the mounting block (26) facing the cover plate (24) protrudes beyond the surface of the rib (22) facing the cover plate (24).

8. The battery module of any one of claims 1 to 4, wherein, The heat insulation part (23) is made of gel material or phase change material.

9. A battery pack comprising a battery module, characterized by, The battery module is the battery module according to any one of claims 1 to 8.

10. The battery pack of claim 9, wherein, The battery pack includes a chassis (31) and a control component (32). The control component (32) and the battery module are both mounted on the chassis (31). The separator assembly (20) of the battery module is located between the control component (32) and the battery cell (10) of the battery module.

11. The battery pack of claim 10, wherein, The battery cell section (10) includes a plurality of battery cells (11), which are stacked together, and the separator assembly (20) is disposed on the outer side of the outermost battery cell (11) among the plurality of battery cells (11).

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