Battery cell housing, battery cell, and battery

Abstract

Provided in the present application are a battery cell housing, a battery cell, and a battery, relating to the technical field of batteries. The battery cell housing comprises a housing body, the housing body defines an electrode assembly accommodating cavity, a heat exchange space is formed on at least part of the housing body, and the heat exchange space is filled with a heat exchange medium.

Description

Battery cell shell, battery cell and battery

[0001] This application claims priority to Chinese patent applications No. 202421551203.5 and 202410882157.5, filed on July 02, 2024, with the China Patent Office, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a battery cell shell, a battery cell and a battery. BACKGROUND

[0003] A battery cell is one of the important components of a battery. The battery cell includes a shell, an electrode assembly arranged in the shell, and an electrode terminal arranged on the shell. During the charging and discharging process of the battery, heat is generated, which affects the performance of the battery. Therefore, in the related art, a uniform temperature plate is attached to the outer wall of the battery cell to dissipate heat from the battery cell, so as to prevent local overheating of the battery, thereby improving the overall thermal stability.

[0004] The uniform temperature plate is a component with a wick structure inside and a cavity filled with a fluid heat exchange medium. The cavity is divided into a heated area and a cold end. The fluid heat exchange medium absorbs heat in the heated area and evaporates into a gaseous heat exchange medium. The gaseous heat exchange medium diffuses to the cold end away from the heated area, condenses into a liquid heat exchange medium at the cold end, and thus achieves the purpose of heat dissipation. The gaseous heat exchange medium condenses into a liquid and returns to the heated area by capillary force of the wick structure for evaporation and heat absorption again. SUMMARY

[0005] This heat dissipation method requires that the uniform temperature plate and the shell of the battery cell be bonded together by glue. If the glue is not evenly applied, air will exist between the uniform temperature plate and the shell. Since air has a low thermal conductivity, the heat exchange effect between the uniform temperature plate and the battery cell will be reduced. At the same time, the uniform temperature plate has a certain thickness, which occupies a certain space in the battery. As a result, the volume of the battery is large, and the energy density of the battery is low.

[0006] The present application provides a battery cell shell, a battery cell and a battery, which can improve the problem of large volume of the battery.

[0007] In a first aspect, the present application provides a battery cell shell, which includes a shell body, the shell body enclosing an electrode assembly accommodating cavity, at least part of the shell body forming a heat exchange space, and the heat exchange space being filled with a heat exchange medium.

[0008] In a second aspect, the present application provides a battery cell, which comprises an electrode assembly, an electrode terminal and the aforementioned battery cell housing; the electrode assembly is arranged in the electrode assembly accommodating cavity; the electrode terminal is arranged on the battery cell housing and connected with the electrode assembly.

[0009] In a third aspect, the present application provides a battery, which comprises the aforementioned battery cell, and the battery cell is multiple, and the multiple battery cells are connected in series or in parallel. Advantages

[0010] In the present application, by forming at least part of the housing body into a heat exchange space, the electrode assembly accommodating cavity and the heat exchange space can share one plate body, so that the adjacent cavity walls between them are respectively formed on two opposite plate surfaces of the plate body, and then one of the plate body for forming part of the cavity wall of the electrode assembly accommodating cavity and the plate body for forming part of the cavity wall of the heat exchange space between the electrode assembly accommodating cavity and the heat exchange space can be omitted. In this way, the volume and weight of the battery provided with the heat exchange space can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0011] Fig. 1 is a structural schematic view of a battery cell housing provided by an embodiment of the present application;

[0012] Fig. 2 is a side view of the battery cell housing provided by an embodiment of the present application;

[0013] Fig. 3 is a sectional view along A-A in Fig. 2;

[0014] Fig. 4 is a structural schematic view of a surrounding plate provided by an embodiment of the present application;

[0015] Fig. 5 is a side view of a plate surface on the battery cell housing for forming a heat exchange space provided by an embodiment of the present application;

[0016] Fig. 6 is a sectional view along B-B in Fig. 5;

[0017] Fig. 7 is an enlarged view of C in Fig. 6;

[0018] Fig. 8 is an enlarged view of D in Fig. 7;

[0019] Fig. 9 is a structural schematic view of a second base plate provided by an embodiment of the present application;

[0020] Fig. 10 is a structural schematic view of a battery cell provided by an embodiment of the present application;

[0021] Fig. 11 is a structural schematic view of a battery provided by an embodiment of the present application.

[0022] Explanation of reference signs:

[0023] 001 - battery cell housing;

[0024] 002 - housing body; 021 - electrode assembly accommodating cavity; 022 - shell; 221 - opening; 222 - coaming; 2221 - first side plate; 2222 - second side plate; 223 - end plate; 023 - cover plate;

[0025] 003 - vapor chamber; 031 - first substrate; 032 - second substrate; 321 - groove; 322 - first protrusion; 323 - second protrusion; 324 - slot body; 325 - first surface; 326 - second surface; 327 - body portion; 328 - connecting portion; 033 - heat exchange space;

[0026] 004 - battery cell; 041 - electrode terminal;

[0027] 005 - battery; 051 - battery box. Embodiments of the present application

[0028] Please refer to FIG. 1 to FIG. 3, FIG. 1 is a structural schematic diagram of a battery cell housing 001 provided by an embodiment of the present application, FIG. 2 is a side view of the battery cell housing 001 provided by an embodiment of the present application, and FIG. 3 is a sectional view along A-A in FIG. 2. An embodiment of the present application provides the battery cell housing 001, which comprises a housing body 002. The housing body 002 encloses the electrode assembly accommodating cavity 021, and at least part of the housing body 002 is provided with a heat exchange space 033, which is filled with a heat exchange medium.

[0029] It can be understood that the heat exchange medium includes but is not limited to pure water, ethanol, distilled water, heat-conducting liquid, cooling liquid, and phase-change medium.

[0030] The plate surface of the housing body 002 provided with the heat exchange space 033 is a liquid cooling plate, a vapor chamber, or a phase-change material plate. When the plate surface is a vapor chamber, a wick is further arranged in the heat exchange space 033. When the plate surface is a liquid cooling plate, one end of the heat exchange space 033 is an inlet end, and the other end is an outlet end. The heat exchange space 033 can be an S-shaped channel structure. When the plate surface is a phase-change material plate, the heat exchange medium is a phase-change material, such as lithium nitrate trihydrate, calcium chloride crystalline hydrate, sodium sulfate crystalline hydrate, or paraffin.

[0031] In addition, when part of the housing body 002 is provided with the heat exchange space 033, the part of the housing body 002 other than the part provided with the heat exchange space 033 is defined as a mounting opening. The plate surface provided with the heat exchange space 033 is arranged in the mounting opening, and the periphery of the plate surface is welded or integrally formed with the periphery of the mounting opening. In order to improve the reliability of the welded part, the material of the plate surface provided with the heat exchange space 033 is consistent with the material of the remaining part of the housing body 002.

[0032] The battery cell shell 001 can be a shell of a cylindrical battery cell or a shell of a square battery cell.

[0033] It can be understood that the shell body 002 includes the shell 022 and the cover plate 023, and the heat exchange space 033 can be formed on at least part of the shell 022, or the heat exchange space 033 can be formed on at least part of the cover plate 023, or the heat exchange space 033 can be formed on at least part of the shell 022 and at least part of the cover plate 023.

[0034] In addition, the heat exchange space 033 can be formed by a metal shell having an inner cavity, and the material of the metal shell includes but is not limited to stainless steel, copper, aluminum, copper alloy, and aluminum alloy. The inner cavity of the metal shell is the heat exchange space 033.

[0035] In the embodiment, by forming the heat exchange space 033 on at least part of the shell body 002, the electrode assembly containing cavity 021 and the heat exchange space 033 can share one plate body, so that the cavity walls adjacent to each other between the electrode assembly containing cavity 021 and the heat exchange space 033 are formed on two opposite plate surfaces of the plate body, and then one of the plate body for forming part of the cavity wall of the electrode assembly containing cavity 021 and the plate body for forming part of the cavity wall of the heat exchange space 033 between the electrode assembly containing cavity 021 and the heat exchange space 033 can be omitted. In this way, the volume and weight of the battery provided with the heat exchange space 033 can be reduced, so that the energy density of the battery can be improved.

[0036] In addition, by sharing one plate body for the electrode assembly containing cavity 021 and the heat exchange space 033, the heat inside the battery cell can be directly absorbed by the heat exchange space 033. In this way, not only the heat dissipation path of the battery cell can be shortened, so that the heat dissipation efficiency of the battery cell is improved, but also the adhesive does not need to be configured, so that the cost of auxiliary materials can be reduced, and many adverse factors caused by uneven adhesive can be avoided.

[0037] Referring to FIG. 1, in an embodiment, the shell body 002 includes the shell 022 and the cover plate 023. The shell 022 has the electrode assembly containing cavity 021 and the opening 221 communicating with the electrode assembly containing cavity 021. The cover plate 023 covers the opening 221 to close the electrode assembly containing cavity 021. The heat exchange space 033 is formed on at least part of the shell 022.

[0038] In the embodiment, by forming the heat exchange space 033 on at least part of the shell 022, compared with forming the heat exchange space 033 on the cover plate 023, the layout of the electrode terminal, the explosion-proof valve and other components does not need to be considered, so that the design difficulty of the battery cell shell 001 is controlled, the design of the battery cell shell 001 is relatively simple, and the manufacturing of the battery cell shell 001 is more convenient and easy to produce.

[0039] Specifically, the shell 022 includes a surrounding plate 222 and an end plate 223. The surrounding plate 222 is a cylindrical structure. The end plate 223 is arranged at one end of the surrounding plate 222 and closes the one end of the surrounding plate 222. The cover plate 023 is arranged at the other end of the surrounding plate 222 and closes the other end of the surrounding plate 222; wherein the heat exchange space 033 is formed on at least part of the surrounding plate 222.

[0040] It can be understood that the surrounding plate 222 can be a cylindrical structure, and can also be a rectangular cylindrical structure. Of course, according to some special occasions, the surrounding plate 222 can also be other cylindrical structures, for example, a hexagonal cylindrical structure.

[0041] The cover plate 023 and the end plate 223 are both welded with the surrounding plate 222 to close the electrode assembly accommodating cavity 021.

[0042] In the related art, a liquid cooling plate is arranged at the end plate 223 for heat dissipation, and the surrounding plate 222 is not directly in contact with the liquid cooling plate, so it is necessary to arrange heat dissipation components around the surrounding plate 222 to improve the temperature uniformity of the battery monomer.

[0043] Based on this, in the embodiment, by the above arrangement, the surrounding plate 222 has a heat dissipation function, so that the battery monomer heat dissipation uniformity can be improved, and the temperature difference inside the battery monomer can be reduced. In this way, the reliability of the battery monomer can be improved.

[0044] Please refer to FIG. 4, which is a structural schematic diagram of the surrounding plate 222 provided by the embodiment of the application. In an embodiment, the surrounding plate 222 is a rectangular cylindrical structure. The rectangular cylindrical structure includes a pair of oppositely arranged first side plates 2221 and a pair of oppositely arranged second side plates 2222, the area of the second side plate 2222 is smaller than the area of the first side plate 2221, and the heat exchange space 033 is formed on at least one first side plate 2221.

[0045] It can be understood that the two side edges of a second side plate 2222 are respectively connected with one side edge of two first side plates 2221, and the two side edges of another second side plate 2222 are respectively connected with the other side edge of two first side plates 2221.

[0046] The first side plate 2221 and the second side plate 2222 can be welded to form a rectangular cylindrical structure, or a plate body can be bent multiple times to form a pair of first side plates 2221 and a pair of second side plates 2222, and then the two ends of the plate body are welded to form a rectangular cylindrical structure.

[0047] When the battery cell is a square cell, the battery cell has a large face and a narrow face. The large face is the surface of the first side plate 2221 with a larger area, and the narrow face is the surface of the second side plate 2222. In the related art, a plurality of battery cells are stacked in sequence in a direction perpendicular to the large face. Therefore, it is necessary to arrange a heat dissipation structure on the large face of the battery cell to improve the poor heat dissipation of the large face caused by the stacked battery cells.

[0048] Based on this, in the present embodiment, at least the first side plate 2221 with a larger area is provided with a heat exchange space 033, which can improve the heat dissipation effect of the part of the battery cell with a large heat dissipation requirement, thereby improving the uniformity of the heat dissipation of the battery cell, and further reducing the temperature difference inside the battery cell. In this way, the reliability of the battery cell can be improved.

[0049] In addition to the heat exchange space 033 provided on the shell 022 in the above-mentioned embodiment, the heat exchange space 033 can also be configured on the cover plate 023. Specifically, the shell body 002 includes the shell 022 and the cover plate 023. The shell 022 has an electrode assembly accommodating cavity 021 and an opening 221 communicating with the electrode assembly accommodating cavity 021. The cover plate 023 covers the opening 221 to close the electrode assembly accommodating cavity 021. The heat exchange space 033 is formed on at least part of the cover plate 023.

[0050] In the present embodiment, through the above-mentioned arrangement, one end of the battery cell can be cooled by the liquid-cooled large plate, and the other end can be cooled by the cover plate 023, so that both ends of the battery cell can be cooled, thereby improving the heat dissipation efficiency of the battery cell. The liquid-cooled large plate refers to a liquid-cooled plate that is in thermal coupling with the end portions of a plurality of battery cells at the same time.

[0051] Please refer to FIGS. 5 to 7. FIG. 5 is a side view of a plate surface of a battery cell shell 001 for forming a heat exchange space 033 according to an embodiment of the present application. FIG. 6 is a sectional view of B-B in FIG. 5. FIG. 7 is an enlarged view of C in FIG. 6. In an embodiment, at least part of the shell body 002 includes a first substrate 031 and a second substrate 032 connected to each other, and the first substrate 031 and the second substrate 032 jointly define the heat exchange space 033.

[0052] Specifically, a groove 324 can be provided in one of the first substrate 031 and the second substrate 032, and the other one closes the groove 324 to form the heat exchange space 033. Alternatively, both the first substrate 031 and the second substrate 032 can be provided with grooves 324, and the second substrate 032 and the first substrate 031 are connected to each other to combine the two grooves 324 into the heat exchange space 033.

[0053] The second substrate 032 can be buckled with the first substrate 031, welded with the first substrate 031, or connected with the first substrate 031 by screws, and a sealing ring is arranged between the fitting parts to seal the groove 324.

[0054] In addition, the first substrate 031 can be a shared plate body between the electrode assembly accommodating cavity 021 and the heat exchange space 033, and two opposite plate surfaces of the first substrate 031 are respectively formed with cavity walls adjacent to the electrode assembly accommodating cavity 021 and the heat exchange space 033. Alternatively, the second substrate 032 can be a shared plate body between the electrode assembly accommodating cavity 021 and the heat exchange space 033, and two opposite plate surfaces of the second substrate 032 are respectively formed with cavity walls adjacent to the electrode assembly accommodating cavity 021 and the heat exchange space 033.

[0055] It can be understood that when the partial shell body 002 is formed with the heat exchange space 033, the shell body 002 includes a plate body and a heat exchange plate with a heat exchange space. The plate body defines a cavity and is provided with a mounting opening in communication with the cavity. The heat exchange plate is arranged in the mounting opening and encloses the electrode assembly accommodating cavity 021 together with the plate body.

[0056] The periphery of the first substrate 031 and / or the second substrate 032 is welded with the periphery of the mounting opening. In order to improve the reliability of the welded part, the material of the first substrate 031 or the second substrate 032 welded with the mounting opening is consistent with the material of the remaining part of the shell body 002.

[0057] In the embodiment, the above arrangement makes the structure of the heat exchange space 033 simple and easy to manufacture, thereby controlling the manufacturing cost of the battery monomer shell 001 and improving the manufacturing efficiency.

[0058] Referring to FIG. 7, in an embodiment, the second substrate 032 has a first surface 325 away from the first substrate 031, and a groove 321 is formed in the second substrate 032 from the first surface 325.

[0059] Optionally, the groove 321 is arranged opposite to the heat exchange space 033 in a direction perpendicular to the first substrate 031.

[0060] It can be understood that the groove 321 can be circular, rectangular, elliptical, etc. Specifically, the groove 321 is a circular groove 321, and there are a plurality of grooves 321, which are distributed in a matrix along the long side and the wide side of the first substrate 031.

[0061] In the embodiment, the above arrangement can increase the area of the heat exchange surface of the heat exchange space 033, thereby improving the heat dissipation efficiency of the battery monomer.

[0062] Referring to FIG. 7, in an embodiment, the second substrate 032 further has a second surface 326 facing the first substrate 031. A plurality of first protrusions 322 are protruded from the second surface 326 towards the first substrate 031. The first protrusions 322 are located in the heat exchange space 033. A plurality of grooves 321 correspond to the plurality of first protrusions 322 one-to-one. The grooves 321 extend into the corresponding first protrusions 322. In one embodiment, the first protrusions 322 abut the first substrate 031. In another embodiment, the first protrusions 322 are spaced apart from the first substrate 031.

[0063] It can be understood that, in order to control the weight and size of the battery cell housing 001, the thickness of the second substrate 032 is small. Therefore, if the depth of the groove 321 formed directly on the second substrate 032 is small, the area of the heat exchange surface of the heat exchange space 033 is increased by a small amount.

[0064] Based on this, in the present embodiment, by extending the groove 321 into the corresponding first protrusion 322, the depth of the groove 321 can be increased while the overall size and weight of the battery cell housing 001 are controlled, thereby increasing the area of the heat exchange surface of the heat exchange space 033. In this way, the heat dissipation efficiency of the battery cell can be improved.

[0065] In one embodiment, the groove 321 can be formed by stamping on the second substrate 032.

[0066] In addition, when impacted, the rigidity of the part of the battery cell housing having the heat exchange space 033 can be increased based on the abutment of the first protrusion 322 and the first substrate 031, thereby improving the impact resistance.

[0067] When the first protrusion 322 is spaced apart from the first substrate 031, the second substrate 032 can be elastically deformed towards the first substrate 031, or the first substrate 031 can be elastically deformed towards the second substrate 032 when impacted, until the first protrusion 322 abuts the first substrate 031. In this way, the first substrate 031 or the second substrate 032 can absorb a portion of the impact by elastic deformation, thereby improving the stress state of the components inside the battery cell, and thus improving the reliability of the battery cell.

[0068] Furthermore, by spacing the first protrusion 322 apart from the first substrate 031, the contact area of the fluid with the first substrate 031 can be increased, thereby improving the heat exchange efficiency. At the same time, the pressure drop of the fluid flowing from the hot zone to the cold end can be reduced, thereby allowing the fluid to have a faster flow rate, and thus improving the heat exchange efficiency.

[0069] Please refer to FIG. 8, which is an enlarged view of D in FIG. 7. In an embodiment, the first protrusion 322 is spaced apart from the first substrate 031, and the spacing between the first protrusion 322 and the first substrate 031 is s, which satisfies: 0 < s ≤ 0.1 mm.

[0070] Illustratively, the spacing s includes but is not limited to 0.01 mm, 0.21 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.065 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm.

[0071] Specifically, 0.5 mm ≤ s ≤ 1 mm.

[0072] In the present embodiment, by the above definition, on the one hand, the first protrusion 322 and the first substrate 031 have a spacing therebetween, so that when impacted, the second substrate 032 can elastically deform based on the spacing, so that the second substrate 032 can absorb a portion of the impact, thereby reducing the impact force received by the components inside the battery monomer. In this way, the reliability of the battery monomer can be improved; on the other hand, the spacing cannot be too large, which can cause the first protrusion 322 to have weak support for the second substrate 032, so that it has appropriate strength to resist impact.

[0073] In an embodiment, the first substrate 031 is closer to the electrode assembly accommodation cavity 021 than the second substrate 032.

[0074] Wherein, the side of the first substrate 031 away from the second substrate 032 is the cavity wall of the electrode assembly accommodation cavity 021.

[0075] It can be understood that since the second substrate 032 is provided with structures such as the groove 321, the first protrusion 322, and the second protrusion 323, and the first substrate 031 is a flat plate structure. Therefore, the flatness control of the first substrate 031 is easier than that of the second substrate 032.

[0076] Based on this, compared with forming the cavity wall of the electrode assembly accommodation cavity 021 on one side of the second substrate 032, the present embodiment uses the side of the first substrate 031 with higher flatness away from the second substrate 032 as the cavity wall of the electrode assembly accommodation cavity 021, which can be directly assembled when forming the battery monomer shell, without the need for additional flatness adjustment process, thereby reducing the difficulty of forming the battery monomer shell 001, and improving the flatness of the cavity wall of the electrode assembly accommodation cavity 021, thereby improving the dimensional accuracy of the electrode assembly accommodation cavity 021. In this way, the manufacturing precision of the battery monomer can be improved.

[0077] Please refer to FIG. 8, in an embodiment, the depth of the groove 321 is d, which satisfies: 0.5 mm ≤ d ≤ 1 mm.

[0078] For example, d includes, but is not limited to, 0.5mm, 0.58mm, 0.6mm, 0.65mm, 0.72mm, 0.75mm, 0.78mm, 0.8mm, 0.95mm, and 1mm.

[0079] Specifically, 0.6mm≤d≤1mm.

[0080] In this embodiment, the above-mentioned arrangement allows the groove 321 to have sufficient depth to increase the area of ​​the heat exchange surface of the heat exchange space 033; on the other hand, it avoids the groove 321 from being too deep and affecting the arrangement of the first protrusion 322 and the inner cavity, thereby reducing the design difficulty.

[0081] Please refer to Figure 8. In one embodiment, the cross-section of the groove 321 is circular, and the diameter of the end of the groove 321 away from the first substrate 031 is φ, which satisfies: 0.5mm≤φ≤1mm.

[0082] The cross-sectional area of ​​the groove 321 refers to the cross-section of the groove 321 parallel to the first substrate 031.

[0083] For example, φ includes, but is not limited to, 0.5mm, 0.58mm, 0.6mm, 0.65mm, 0.72mm, 0.75mm, 0.78mm, 0.8mm, 0.95mm, and 1mm.

[0084] Specifically, 0.6mm≤φ≤0.9mm.

[0085] In this embodiment, by limiting the above, on the one hand, the diameter of the groove 321 is too small, which can avoid the difficulty of molding and thus reduce its manufacturing cost; on the other hand, stress concentration caused by the excessive diameter of the groove 321 can be reduced, thereby avoiding material fatigue and improving the strength of the plate surface on the outer shell body 002 where the heat exchange space 033 is formed.

[0086] Referring to Figure 7, in one embodiment, the second substrate 032 further has a second surface 326 facing the first substrate 031, and a plurality of second protrusions 323 protrude from the second surface 326 toward the first substrate 031. The second protrusions 323 are located within the heat exchange space 033. The second protrusions 323 abut against the first substrate 031, or the second protrusions 323 are spaced apart from the first substrate 031.

[0087] It is understandable that the parts of the battery cell casing with heat exchange space 033 have lower strength and poorer impact resistance.

[0088] Based on this, in the embodiment, by arranging the second protrusion 323, when an impact is received, the rigidity of the part of the battery monomer shell having the heat exchange space 033 can be improved based on the abutment of the second protrusion 323 and the first substrate 031, and the impact resistance is further improved.

[0089] In addition, when the second protrusion 323 is arranged spaced apart from the first substrate 031, when an impact is received, the second substrate 032 can be elastically deformed to the first substrate 031, or the first substrate 031 can be elastically deformed to the second substrate 032, until the second protrusion 323 abuts against the first substrate 031. In this way, the first substrate 031 or the second substrate 032 can absorb part of the impact by elastic deformation to improve the stress state of the components inside the battery monomer, thereby improving the reliability of the battery monomer.

[0090] It can be understood that by arranging the second protrusion 323 spaced apart from the first substrate 031, the contact area of the fluid with the first substrate 031 can be increased, thereby improving the heat exchange efficiency. At the same time, the pressure drop of the fluid flowing from the heated area to the cold end can be reduced, so that the fluid has a faster flow rate, thereby improving the heat exchange efficiency.

[0091] The second protrusion 323 and the first protrusion 322 can be the same structure, so that the second protrusion 323 and the first protrusion 322 can be formed at the same time when the groove 321 is formed by stamping. In this way, the battery monomer shell 001 is simple to form and easy to manufacture.

[0092] When the first protrusion 322 and the second protrusion 323 are two components, the spacing between the first protrusion 322 and the first substrate 031 is consistent with the spacing between the second protrusion 323 and the first substrate 031.

[0093] In addition, the first protrusion 322 and the second protrusion 323 can also act as a spoiler, which can have a spoiler effect on the heat exchange medium, thereby increasing the heat dissipation effect and the uniformity of heat dissipation.

[0094] Referring to FIG. 8, in an embodiment, the second protrusion 323 is arranged spaced apart from the first substrate 031, and the spacing between the second protrusion 323 and the first substrate 031 is s, which satisfies: 0 < s ≤ 0.1 mm.

[0095] Exemplarily, the spacing s includes but is not limited to 0.01 mm, 0.21 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.065 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm.

[0096] Specifically, 0.5 mm ≤ s ≤ 1 mm.

[0097] In the embodiment, by the above definition, on the one hand, the second protrusion 323 and the first substrate 031 have a spacing, so that when impacted, the second substrate 032 can be elastically deformed based on the spacing, so that the second substrate 032 can absorb a part of the impact, thereby reducing the impact force on the components inside the battery monomer. In this way, the reliability of the battery monomer can be improved; on the other hand, the spacing cannot be too large, which can cause the second protrusion 323 to have weak support for the second substrate 032, so that it has appropriate strength to resist impact.

[0098] Referring to FIG. 9, FIG. 9 is a structural schematic diagram of the second substrate 032 provided by the embodiment of the application. In an embodiment, the second substrate 032 is provided with a groove 324 on the side facing the first substrate 031. The first substrate 031 closes the opening 221 of the groove 324 to form a heat exchange space 033.

[0099] In the embodiment, by the above arrangement, the heat exchange space 033 is formed by the groove 324 on the second substrate 032, so that the first substrate 031 can be a flat plate structure, thereby reducing the manufacturing difficulty of the first substrate 031. In this way, the manufacturing efficiency of the battery monomer can be improved.

[0100] Referring to FIG. 9, in an embodiment, the second substrate 032 includes a body part 327 and a connecting part 328 connected to the periphery of the body part 327. The part of the body part 327 close to the first substrate 031 is thinned to form the groove 324. The connecting part 328 is configured to be connected with the first substrate 032 so that the space between the body part 327 and the first substrate 031 forms the heat exchange space 033. In this way, the second substrate 032 has a simple structure and is easy to manufacture.

[0101] For example, the body part 327 and the connecting part 328 are integrally formed.

[0102] As shown in FIG. 1, in an embodiment, at least part of the shell body 002 is a uniform temperature plate 003, and the inner cavity of the uniform temperature plate 003 is the heat exchange space 033.

[0103] In the embodiment, by the above arrangement, the battery monomer has low heat dissipation cost and is easy to maintain.

[0104] Referring to FIG. 10, FIG. 10 is a structural schematic diagram of the battery monomer 004 provided by the embodiment of the application. Accordingly, the embodiment of the application provides a battery monomer 004. The battery monomer 004 includes an electrode assembly, an electrode terminal 041, and a battery monomer shell 001 disclosed by some embodiments of the application. The electrode assembly is arranged in the electrode assembly accommodating cavity 021. The electrode terminal 041 is arranged on the battery monomer shell 001 and connected with the electrode assembly.

[0105] It can be understood that the electrode terminal 041 includes a positive electrode terminal and a negative electrode terminal. The electrode assembly can be formed by stacking the positive electrode sheet, the separator, and the negative electrode sheet in sequence, or can be formed by stacking the positive electrode sheet, the separator, and the negative electrode sheet in sequence and winding. The battery monomer also includes a positive electrode tab, a negative electrode tab, a positive electrode current collector, and a negative electrode current collector. The positive electrode sheet is connected to the positive electrode current collector through the positive electrode tab, and the positive electrode current collector is connected to the positive electrode terminal. The negative electrode sheet is connected to the negative electrode current collector through the negative electrode tab, and the negative electrode current collector is connected to the negative electrode terminal.

[0106] In the embodiment, by adopting the battery monomer shell 001 disclosed in some embodiments of the application, the electrode assembly accommodation cavity 021 and the heat exchange space 033 can share one plate body, so that the adjacent cavity walls between them are respectively formed on two opposite plate surfaces of the plate body, thereby one of the plate bodies for forming part of the cavity wall of the electrode assembly accommodation cavity 021 and the plate body for forming part of the cavity wall of the heat exchange space 033 between the electrode assembly accommodation cavity 021 and the heat exchange space 033 can be omitted. In this way, the volume and weight of the battery provided with the heat pipe component can be reduced, thereby the energy density of the battery can be improved.

[0107] Correspondingly, FIG. 11 is a structural schematic diagram of a battery 005 provided by an embodiment of the application. The embodiment of the application provides a battery 005, which includes a battery monomer 004 disclosed in some embodiments of the application. The battery monomer 004 is multiple, and the multiple battery monomers 004 are connected in series or connected in parallel.

[0108] It can be understood that the battery 005 also includes a battery box 051 or a bottom plate. The battery monomer 004 is arranged in the battery box 051 or mounted on the bottom plate.

[0109] In the embodiment, by adopting the battery monomer 004 disclosed in some embodiments of the application, the electrode assembly accommodation cavity 021 and the heat exchange space 033 can share one plate body, so that the adjacent cavity walls between them are respectively formed on two opposite plate surfaces of the plate body, thereby one of the plate bodies for forming part of the cavity wall of the electrode assembly accommodation cavity 021 and the plate body for forming part of the cavity wall of the heat exchange space 033 between the electrode assembly accommodation cavity 021 and the heat exchange space 033 can be omitted. In this way, the volume and weight of the battery 005 provided with the heat pipe component can be reduced, thereby the energy density of the battery 005 can be improved.

Claims

1. A battery cell housing (001) comprising a housing body (002) enclosing an electrode assembly accommodating cavity (021), at least part of the housing body (002) being provided with a heat exchange space (033) filled with a heat exchange medium.

2. The battery cell housing (001) according to claim 1, wherein, The housing body (002) comprises: a shell (022) having the electrode assembly accommodating cavity (021) and an opening (221) communicating with the electrode assembly accommodating cavity (021) ; a cover plate (023) covering the opening (221) to close the electrode assembly accommodating cavity (021) ; wherein the heat exchange space (033) is formed on at least part of the shell (022).

3. The battery cell housing (001) according to claim 2, wherein, The shell (022) comprises: a surrounding plate (222) in a cylindrical structure; an end plate (223) arranged at one end of the surrounding plate (222) and closing the one end of the surrounding plate (222) ; the cover plate (023) is arranged at the other end of the surrounding plate (222) and closes the other end of the surrounding plate (222) ; wherein the heat exchange space (033) is formed on at least part of the surrounding plate (222).

4. The battery cell housing (001) according to claim 3, wherein, The surrounding plate (222) is a rectangular cylindrical structure, which comprises a pair of oppositely arranged first side plates (2221) and a pair of oppositely arranged second side plates (2222), the area of the second side plate (2222) is smaller than that of the first side plate (2221), and the heat exchange space (033) is formed on at least one of the first side plates (2221).

5. The battery cell housing (001) according to any one of claims 1-4, wherein, The housing body (002) comprises: a shell (022) having the electrode assembly accommodating cavity (021) and an opening (221) communicating with the electrode assembly accommodating cavity (021) ; a cover plate (023) covering the opening (221) to close the electrode assembly accommodating cavity (021) ; wherein the heat exchange space (033) is formed on at least part of the cover plate (023).

6. The battery cell housing (001) according to any one of claims 1-5, wherein, At least part of the housing body (002) comprises a first substrate (031) and a second substrate (032) connected to each other, the first substrate (031) and the second substrate (032) together defining the heat exchange space (033).

7. The battery cell housing (001) according to claim 6, wherein, The second substrate (032) has a first surface (325) away from the first substrate (031), and a plurality of grooves (321) are formed in the second substrate (032) from the first surface (325).

8. The battery cell housing (001) according to claim 7, wherein, The second substrate (032) also has a second surface (326) facing the first substrate (031), and a plurality of first protrusions (322) are provided on the first substrate (031) from the second surface (326), the first protrusions (322) being located in the heat exchange space (033), the plurality of grooves (321) and the plurality of first protrusions (322) one-to-one corresponding, and the grooves (321) extending into the corresponding first protrusions (322). The first protrusion (322) is in abutment with the first substrate (031), or the first protrusion (322) is arranged in a spaced manner with the first substrate (031).

9. The battery cell housing (001) according to claim 8, wherein, The first protrusion (322) is arranged in a spaced manner with the first substrate (031), and the spacing between the first protrusion (322) and the first substrate (031) is s, satisfying 0 < s ≤ 0.1 mm.

10. The battery cell housing (001) according to any one of claims 7-9, wherein, The first substrate (031) is closer to the electrode assembly accommodating cavity (021) than the second substrate (032).

11. The battery cell housing (001) according to any one of claims 7-9, wherein, The depth of the groove (321) is d, satisfying 0.5 mm ≤ d ≤ 1 mm.

12. The battery cell housing (001) according to any one of claims 7-9, wherein, The cross section of the groove (321) is circular, and the diameter of the end of the groove (321) away from the first substrate (031) is φ, satisfying 0.5 mm ≤ φ ≤ 1 mm.

13. The battery cell housing (001) according to any one of claims 6-12, wherein, The second substrate (032) further has a second surface (326) facing the first substrate (031), and a plurality of second protrusions (323) are arranged on the second surface (326) and protrude towards the first substrate (031), and the second protrusions (323) are located in the heat exchange space (033). The second protrusion (323) is in abutment with the first substrate (031), or the second protrusion (323) is arranged in a spaced manner with the first substrate (031).

14. The battery cell housing (001) of claim 13, wherein, The second protrusion (323) is arranged in a spaced manner with the first substrate (031), and the spacing between the second protrusion (323) and the first substrate (031) is s, satisfying 0 < s ≤ 0.1 mm.

15. The battery cell housing (001) according to any one of claims 6-14, wherein, The second substrate (032) is provided with a groove body (324) on one side facing the first substrate (031), and the first substrate (031) closes the opening (221) of the groove body (324) to form the heat exchange space (033).

16. The battery cell housing (001) of claim 15, wherein, The second substrate (032) includes a body part (327) and a connecting part (328) connected with the periphery of the body part (327), the part of the body part (327) close to the first substrate (031) is thinned to form the groove body (324), and the connecting part (328) is configured to be connected with the first substrate (032) so that the space between the body part (327) and the first substrate (031) forms the heat exchange space (033).

17. The battery cell housing (001) according to any one of claims 1-16, wherein, At least part of the shell body (002) is a uniform temperature plate (003), and the inner cavity of the uniform temperature plate (003) is the heat exchange space (033).

18. A battery cell, comprising: The battery cell shell (001) according to any one of claims 1-17; An electrode assembly arranged in the electrode assembly accommodating cavity (021); An electrode terminal arranged on the battery cell shell (001) and connected with the electrode assembly.

19. A battery, comprising a plurality of battery cells according to claim 18, and the plurality of battery cells are connected in series or in parallel.

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