Battery pack and electric equipment
By setting heat insulation parts with different thermal resistances at different locations of the battery cells, the problem of uneven temperature distribution in the battery pack was solved, achieving temperature uniformity and performance improvement of the battery pack, extending battery life, and reducing material costs.
Patent Information
- Application Number
- CN202520297871.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-02-24
AI Technical Summary
Existing battery packs suffer from inconsistent battery performance degradation due to uneven temperature distribution when left undisturbed, affecting their lifespan. Furthermore, existing insulation materials are either expensive or have limited insulation performance.
By setting heat insulation parts with different thermal resistances at different locations of the battery cells, and using high thermal resistance heat insulation parts near the edge beam area and low thermal resistance heat insulation parts near the middle area, the heat preservation performance of the battery cells can be adjusted to achieve uniform temperature distribution.
It improves the temperature uniformity of the battery pack, extends the performance and lifespan of the battery pack, and reduces material costs.
Smart Images
Figure CN223785254U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a battery technology field, concretely relates to a battery pack and electric equipment. BACKGROUND
[0002] With the popularity of electric vehicles and energy storage devices, the thermal management of battery packs is increasingly concerned. In the battery pack static state, due to uneven environmental temperature distribution and battery characteristics, temperature difference is easy to produce in different positions of the battery pack. Long-term temperature difference accumulation will lead to inconsistent battery performance degradation, affecting the overall service life. One of the existing technologies is to use active cooling or temperature equalizing structure, but there are problems such as high energy consumption and complex structure.
[0003] In addition, the existing thermal insulation materials mainly include aerogel or foam. Aerogel has good heat preservation performance, but the cost is high; and the heat preservation performance of foam is limited, so there is certain bottleneck restriction on the heat preservation and temperature equalizing performance of the existing battery pack.
[0004] Therefore, there is an urgent need for a temperature equalization scheme to achieve uniform temperature distribution in the battery pack without additional energy consumption and at a lower cost. SUMMARY
[0005] The present application provides a battery pack and electric equipment to solve or at least improve the problems in the background art.
[0006] In one aspect, the present application provides a battery pack, comprising: a frame, the frame comprising a first side beam extending along a first direction and a second side beam extending along a second direction; a battery module, the battery module being arranged in the frame; the battery module comprising a plurality of battery cells arranged along the first direction and a thermal insulation member, the thermal insulation member being arranged between adjacent battery cells and being attached to the battery cells; wherein, in the second direction, the thermal insulation member comprises a first thermal insulation part and a second thermal insulation part, the distance between the first thermal insulation part and the first side beam is less than the distance between the second thermal insulation part and the first side beam, and the thermal resistance of the first thermal insulation part is greater than the thermal resistance of the second thermal insulation part.
[0007] By arranging thermal insulation parts with different thermal resistances at different positions of the battery cells, the heat preservation performance of the battery cells is adjusted, higher thermal resistance thermal insulation parts are arranged in the area where the battery cells are closer to the first side beam, and lower thermal resistance thermal insulation parts are arranged in the area where the battery cells are closer to the middle of the battery pack, so that the heat preservation and insulation performance of the same battery cell at different positions tends to be consistent, thereby improving the temperature equalizing performance of the battery pack, and further improving the performance and life of the battery pack.
[0008] Further, the thermal conductivity of the first thermal insulation part is less than the thermal conductivity of the second thermal insulation part.
[0009] Further, the material of the first thermal insulation part is aerogel; and / or, the material of the second thermal insulation part is foam.
[0010] Further, in the second direction, the length of the first thermal insulation part is less than the length of the second thermal insulation part.
[0011] Further, in the second direction, the length of the battery cell is 300mm to 2000mm.
[0012] Further, the thermal insulation part comprises a first thermal insulation pad and a second thermal insulation pad; wherein the distance between the first thermal insulation pad and the second side beam is less than the distance between the second thermal insulation pad and the second side beam, and the total thermal resistance value of the first thermal insulation pad is greater than the total thermal resistance value of the second thermal insulation pad.
[0013] Further, the thickness of the first thermal insulation pad is greater than the thickness of the second thermal insulation pad; and / or, the average thermal conductivity of the first thermal insulation pad is less than the average thermal conductivity of the second thermal insulation pad.
[0014] Further, the battery pack further comprises a cross beam, which is arranged in the frame and connected with the first side beam.
[0015] Further, the battery module is arranged between the second side beam and the cross beam; the battery module comprises at least three thermal insulation parts; from the second side beam to the cross beam, the total thermal resistance value of the thermal insulation parts of the battery module first decreases and then increases.
[0016] Finally, the application also provides a power utilization device, which comprises the battery pack as described above. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 FIG. 1 is a structural schematic diagram of a battery pack according to an embodiment of the present application.
[0018] Figure 2 FIG. 2 is a structural schematic diagram of a thermal insulation part according to an embodiment of the present application.
[0019] Figure 3 FIG. 3 is a structural schematic diagram of a battery pack according to another embodiment of the present application.
[0020] Figure 4 FIG. 4 is a structural schematic diagram of a thermal insulation part according to another embodiment of the present application. DETAILED DESCRIPTION
[0021] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application. However, the present application can be practiced in a large number of other ways not described herein, and it is understood that similar modifications can be made by one skilled in the art without departing from the spirit and scope of the present application, and therefore the present application is not limited to the specific implementation disclosed below.
[0022] In the description of the present application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by up, down, front, back, left, right, inside, outside, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.
[0023] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and the skilled person in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.
[0024] In the description of the present application, the description of the reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some implementation" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application.
[0025] Embodiment one
[0026] Referring to Figures 1 to 2 , a battery pack is provided, comprising a frame 1, a battery module 2 arranged in the frame 1.
[0027] Among them, the frame 1 comprises a first side beam 11 extending along a first direction and a second side beam 12 extending along a second direction. It can be understood that, in general, the first side beam 11 has two oppositely arranged, and the second side beam 12 also has two oppositely arranged, so as to be surrounded by the first side beam 11 and the second side beam 12 to form the frame 1. Exemplarily, the first direction is the length direction of the battery pack, and the second direction is the width direction of the battery pack. Of course, in some other embodiments, the first direction can also be the width direction of the battery pack, and the second direction is the length direction of the battery pack.
[0028] The battery module 2 is arranged in the frame 1, and the battery module 2 comprises a plurality of battery monomers 4 arranged along the first direction. In the present embodiment, the battery monomer 4 is a blade battery, for example, the length of the battery monomer 4 in the second direction is 800mm to 2000mm, for example, 900mm, 1000mm, etc. Of course, the length can be adjusted according to the size and design requirements of the specific battery pack.
[0029] The battery module 2 further comprises a thermal insulation member 3 arranged between and adhered to adjacent battery monomers 4. On one hand, the thermal insulation member 3 has thermal insulation performance, which can realize thermal insulation between adjacent battery monomers, preventing the heat runaway of one battery monomer from spreading to other battery monomers; on the other hand, the thermal insulation member 3 has buffering performance, which can absorb the expansion force of the battery monomer.
[0030] Continuing to refer to Figure 2 In the second direction, the thermal insulation member 3 comprises a first thermal insulation part 31 and a second thermal insulation part 32, the distance from the first thermal insulation part 31 to the first side beam 11 is smaller than the distance from the second thermal insulation part 32 to the first side beam 11, that is, the first thermal insulation part 31 is closer to the first side beam 11 than the second thermal insulation part 32, and the thermal resistance r1 of the first thermal insulation part 31 is greater than the thermal resistance r2 of the second thermal insulation part 32. In other words, in this embodiment, as shown in FIG. 3, the thermal resistance of each thermal insulation part on the thermal insulation member 3 first decreases and then increases from left to right, which can be symmetrically arranged on the left and right sides as an example. Figures 1 to 2
[0031] It should be noted that the thermal resistance r in this application refers to the unit area thermal resistance of the material, that is, r = d / k, where d is the thickness of the material, and k is the thermal conductivity of the material. In other words, the thicker the material, the greater the thermal resistance; the smaller the thermal conductivity, the greater the thermal resistance. The greater r, the slower the heat conduction, and the better the thermal insulation performance of the material.
[0032] In this way, for a battery monomer with a relatively long size, different positions of the same battery monomer are affected differently by the external environment, so that the temperature of different positions of the same battery monomer is different under static conditions, thereby affecting the performance and cycle life of the battery monomer. In this embodiment, the thermal insulation performance of the battery monomer is adjusted by arranging thermal insulation parts with different thermal resistances at different positions of the battery monomer, that is, a thermal insulation part with a higher thermal resistance is arranged in the area of the battery monomer closer to the first side beam, and a thermal insulation part with a relatively low thermal resistance is arranged in the area of the battery monomer close to the middle of the battery pack, so that the thermal insulation performance of the same battery monomer at different positions tends to be consistent, thereby improving the uniformity of the battery pack, and further improving the performance and life of the battery pack.
[0033] Although this embodiment is applied to a blade battery, it can be understood that it is also applicable to prismatic batteries or pouch batteries without departing from the spirit of the application.
[0034] In addition, the battery pack of the present application also comprises a cold plate, a bottom guard plate and the like, for example, the cold plate is arranged below the battery module to heat or cool the battery module according to the specific working condition of the battery pack; and the bottom guard plate is arranged below the cold plate to protect the bottom of the battery pack. The cold plate, bottom guard plate and the like are conventional designs in the art, and will not be described here.
[0035] To form heat insulation sections with different thermal resistances, materials with different thermal conductivity can be selected for the heat insulation sections. For example, the thermal conductivity of the first heat insulation section 31 is less than that of the second heat insulation section 32. Furthermore, the heat insulation member 3 also functions to equalize pressure, therefore the different heat insulation sections have substantially the same thickness. For example, the thickness of the first heat insulation section 31 is equal to the thickness of the second heat insulation section 32, or the difference in their thicknesses is within 0.3 mm. Additionally, the thickness of the heat insulation member 3 is from 0.5 mm to 2 mm, for example, 0.8 mm, 1 mm, 1.5 mm, etc.
[0036] In some specific embodiments, the material of the first heat insulation part 31 is aerogel, which has a low thermal conductivity, for example, 0.02 W / (mK); the material of the second heat insulation part 32 is foam, which has a relatively high thermal conductivity, for example, 0.3 W / (mK).
[0037] Furthermore, depending on specific temperature uniformity requirements, a third heat insulation section can be provided between the first heat insulation section 31 and the second heat insulation section 32, and the thermal conductivity of the third heat insulation section is between that of the first heat insulation section 31 and the second heat insulation section 32. For example, the material of the third heat insulation section can be a modified foam material or a modified aerogel material, such as ceramic fiber aerogel, glass fiber nanomaterials, high-pressure nanoplatelets, high-temperature resistant ceramic silica foam, mica board, etc. This application does not specifically limit the number of heat insulation sections on a single heat insulation component 3; the number can be reasonably determined based on specific battery size, temperature uniformity, and cost requirements.
[0038] See also Figure 2 In this embodiment, in the second direction, the length L1 of the first heat insulation part 31 is less than the length L2 of the second heat insulation part 32. This is because materials with low thermal conductivity, such as aerogel, are expensive. The above design further reduces material costs compared to a heat insulation part made entirely of aerogel or a design where each heat insulation part is equally divided in length.
[0039] See also Figure 1 Since the distances of the individual battery cells 4 at different locations within the battery pack from the second side beam 12 vary, their susceptibility to external environmental influences also differs. To further improve the temperature uniformity of the battery pack, the heat insulation components 3 at different distances from the second side beam 12 are provided with different total thermal resistance values; the closer the heat insulation component is to the second side beam 12, the higher its total thermal resistance value. For example, the heat insulation component 3 includes a first heat insulation pad 301 and a second heat insulation pad 302; wherein the distance from the first heat insulation pad 301 to the second side beam 12 is less than the distance from the second heat insulation pad 302 to the second side beam 12, and the total thermal resistance value of the first heat insulation pad 301 is greater than the total thermal resistance value of the second heat insulation pad 302.
[0040] Wherein, for the total thermal resistance value of the heat insulation member, taking the heat insulation member divided into n heat insulation parts as an example, the total thermal resistance value R of the heat insulation member is 总 satisfies:
[0041]
[0042] Wherein, R1, R2……R n are the thermal resistance values of the respective heat insulation parts.
[0043] For example, R m is the thermal resistance value of the mth heat insulation part on the heat insulation member, the heat transfer area of the heat insulation part is S m , wherein m is a natural number from 1 to n, then: R m = r m / S m , wherein r m is the unit area thermal resistance of the mth heat insulation part.
[0044] To achieve different total thermal resistance values of the heat insulation member, in some specific embodiments, heat insulation members with different thicknesses can be selected, for example, in the case of the same average thermal conductivity of the heat insulation member, the closer to the second side beam 12, the greater the thickness of the heat insulation member. In other embodiments, heat insulation members with different average thermal conductivities can be selected, for example, in the case of the same thickness of the heat insulation member, the closer to the second side beam 12, the lower the average thermal conductivity of the heat insulation member; to achieve a lower average thermal conductivity, for example, the area of the heat insulation part formed by the material with low thermal conductivity can be larger. Of course, the thickness and average thermal conductivity of the heat insulation member can be adjusted at the same time, so that the heat insulation members at different positions in the battery pack have different total thermal resistance values, which does not deviate from the essence of the present application.
[0045] Embodiment Two
[0046] Referring to Figure 3 and Figure 4 The main difference between the battery pack in this embodiment and the battery pack in Embodiment One is that the battery pack in this embodiment further includes a cross beam 5 and a longitudinal beam 6, the cross beam 5 and the longitudinal beam 6 are arranged in the frame 1, and the cross beam 5 is connected with the first side beam 11, and the longitudinal beam 6 is connected with the second side beam 12. Therefore, the battery modules 2 are arranged in the space formed by the cross beam 5, the longitudinal beam 6 and the frame 1, as shown in Figure 3 , there are four battery modules 2 in total.
[0047] In this embodiment, the length of the battery monomer in the second direction is 300mm to 800mm, for example, 500mm, 600mm, etc.
[0048] Due to the setting of the cross beam 5, the metal material of the cross beam makes it easier to exchange heat with the external environment, so that the battery monomer close to the cross beam 5 is greatly affected by the temperature of the external environment. Therefore, in the embodiment, from the second side beam 12 to the cross beam 5, the total thermal resistance value of the heat insulation piece 3 in each battery module 2 first decreases and then increases. In other words, the total thermal resistance value of the heat insulation piece 3 close to the second side beam 12 or close to the cross beam 5 is larger, and the total thermal resistance value of the heat insulation piece 3 in the middle region is smaller.
[0049] It should be pointed out that the total thermal resistance value of the heat insulation piece 3 in the battery module 2 first decreases and then increases, in addition to indicating that the total thermal resistance value of each heat insulation piece changes in turn, it also includes the case of stepwise decrease and then stepwise increase. For example, 10 heat insulation pieces are arranged in a battery module, from the second side beam to the cross beam, for example, the total thermal resistance values of the first-3 heat insulation pieces are all R 总1 , the total thermal resistance values of the fourth-eighth heat insulation pieces are all R 总2 , and the total thermal resistance values of the ninth-10th heat insulation pieces are all R 总3 , wherein R 总1 >R 总2 ,R 总3 >R 总2 . This step change of the total thermal resistance value is also within the protection scope of the present application.
[0050] And in the second direction, referring to Figure 4 , for a single heat insulation piece 3, the heat insulation piece 3 includes a first heat insulation part 31 and a second heat insulation part 32, the distance from the first heat insulation part 31 to the first side beam 11 is smaller than the distance from the second heat insulation part 32 to the first side beam 11, and the thermal resistance of the first heat insulation part 31 is greater than the thermal resistance of the second heat insulation part 32, which is essentially the same as the first embodiment. Although the longitudinal beam 6 is arranged, since the longitudinal beam 6 is opposite to the side with a smaller area of the battery monomer, the heat preservation performance of the battery monomer is less affected.
[0051] In addition, it can be understood that the scheme of the present application is also applicable to a battery pack with only a cross beam or only a longitudinal beam, which does not deviate from the essence of the present application.
[0052] Finally, the present application also provides a power utilization equipment, which comprises the above-mentioned battery pack. For example, the power utilization equipment is a vehicle.
[0053] It should be noted that the utility model although discloses above with preferable embodiment, but it is not used to limit the utility model, and any person skilled in the art can make possible change and modification without departing from the spirit and scope of the utility model, therefore the protection scope of the utility model should be accurate with the range that the utility model right claim defines.
Claims
1. A battery pack, characterized by, The battery pack comprises: a frame, the frame comprising a first side beam extending along a first direction and a second side beam extending along a second direction; a battery module arranged in the frame; the battery module comprising a plurality of battery cells arranged along the first direction and a thermal insulation member arranged between adjacent battery cells and adhered to the battery cells; wherein, in the second direction, the thermal insulation member comprises a first thermal insulation part and a second thermal insulation part, the distance between the first thermal insulation part and the first side beam is less than the distance between the second thermal insulation part and the first side beam, and the thermal resistance of the first thermal insulation part is greater than the thermal resistance of the second thermal insulation part.
2. The battery pack of claim 1, wherein, The thermal conductivity of the first thermal insulation part is less than the thermal conductivity of the second thermal insulation part.
3. The battery pack of claim 2, wherein, The material of the first thermal insulation part is aerogel; and / or, the material of the second thermal insulation part is foam.
4. The battery pack of claim 2, wherein, In the second direction, the length of the first thermal insulation part is less than the length of the second thermal insulation part.
5. The battery pack of claim 1, wherein, In the second direction, the length of the battery cell is 300mm to 2000mm.
6. The battery pack of any one of claims 1-5, wherein, The thermal insulation member comprises a first thermal insulation pad and a second thermal insulation pad; wherein, the distance between the first thermal insulation pad and the second side beam is less than the distance between the second thermal insulation pad and the second side beam, and the total thermal resistance value of the first thermal insulation pad is greater than the total thermal resistance value of the second thermal insulation pad.
7. The battery pack of claim 6, wherein, The thickness of the first thermal insulation pad is greater than the thickness of the second thermal insulation pad; and / or, the average thermal conductivity of the first thermal insulation pad is less than the average thermal conductivity of the second thermal insulation pad.
8. The battery pack of claim 6, wherein, The battery pack further comprises a cross beam arranged in the frame and connected to the first side beam.
9. The battery pack of claim 8, wherein, The battery module is arranged between the second side beam and the cross beam; the battery module comprises at least three thermal insulation members; In the direction from the second side beam to the cross beam, the total thermal resistance value of the thermal insulation members of the battery module first decreases and then increases.
10. An electric device, characterized by The electrical equipment comprises the battery pack according to any one of claims 1-9.