Supporting piece, battery cell shell and battery cell

Abstract

The utility model discloses a supporting piece, a battery cell shell and a battery cell, the supporting piece is an integrated piece, the supporting piece comprises a first supporting plate, a second supporting plate and a third supporting plate, the first supporting plate and the second supporting plate are oppositely arranged in the first direction, the third supporting plate is located between the first supporting plate and the second supporting plate, and the second supporting plate is located between the first supporting plate and the second supporting plate. The first supporting plate and the second supporting plate are arranged on the base and connected with the first supporting plate and the second supporting plate respectively, the first supporting plate and the second supporting plate are each provided with at least one groove in the length direction, the inner wall face of each groove is an arc-shaped face, and in the first direction, the inner wall face of each groove is an arc-shaped face. The grooves in the first supporting plate and the second supporting plate form at least one group of groove pairs, and each groove in the groove pairs can accommodate an arc-shaped corner part of a roll core. According to the supporting piece, the roll core can be supported in multiple directions, and the assembling difficulty is lowered.

Description

Technical Field

[0001] The present application relates to the field of battery cell technology, and more specifically, to a support member, a battery cell housing, and a battery cell. Background Art

[0002] The square wound sodium battery cell has a corner R part after hot pressing, which results in the R part having no support during the subsequent charging and discharging process. There is residual stress with nowhere to release, which accumulates over a long period of time and causes sodium precipitation, leading to cycle attenuation and increased safety risks. The existing aluminum shells on both sides cannot provide effective support for the R part due to the corner gap left at the R part position.

[0003] When assembling battery cells in the prior art, it is necessary to first insert support structures on the left and right sides of the shell, and then roll the core into the shell. Since the support structures cannot be positioned or fixed on the left and right sides, assembly is difficult. Utility Model Content

[0004] One purpose of the present application is to provide a support member that can at least solve the technical problem of difficult assembly caused by the use of insert-type supports in the prior art.

[0005] Another object of the present application is to provide a battery cell casing comprising the above-mentioned support member.

[0006] Another object of the present application is to provide a battery cell, comprising the above-mentioned battery cell shell.

[0007] In order to achieve the above objectives, this application provides the following technical solutions.

[0008] According to the support member for the battery cell shell according to the embodiment of the first aspect of the present application, the support member is an integral member, and the support member includes: a first support plate, a second support plate and a third support plate, the first support plate and the second support plate are arranged opposite to each other in a first direction, the third support plate is located between the first support plate and the second support plate, and is respectively connected to the first support plate and the second support plate, the first support plate and the second support plate are respectively provided with at least one groove in their own length direction, the inner wall surface of each groove is an arc surface, and in the first direction, the grooves on the first support plate and the second support plate form at least one group of groove pairs, and each of the grooves in the groove pair can accommodate an arc-shaped corner portion of the winding core.

[0009] Optionally, the support member is an insulating member.

[0010] Optionally, at least one of the first support plate, the second support plate and the third support plate has a through hole.

[0011] Optionally, the surface of the first support plate or the second support plate has a plurality of protrusions, which are spaced apart along the length direction of the first support plate or the second support plate. Each protrusion is provided with a groove section, and a plurality of the groove sections form the groove.

[0012] For the battery cell housing according to the second aspect embodiment of the present application, a receiving space is defined in the battery cell housing, and the receiving space can be used to install a wound core with arc-shaped corner portions provided at both ends. The battery cell housing has an open end communicating with the receiving space. The battery cell housing includes: a first side plate and a second side plate, which are oppositely arranged in a second direction; a support member, which is the support member described in any one of the above, and the support member is detachably connected to the first side plate and the second side plate respectively. The first support plate, the second support plate, the third support plate, the first side plate and the second side plate enclose the receiving space; a cover plate, which is located at the open end and is used to close the receiving space, and each groove extends in the direction from the third support plate to the cover plate.

[0013] Optionally, the battery cell housing further includes: a third side plate and a fourth side plate, which are oppositely arranged in the first direction. The third side plate, the fourth side plate, the first side plate and the second side plate enclose a channel and the open end. The channel communicates with the open end, and the support member is installed in the channel.

[0014] Optionally, the support member is located in the channel, and there is a gap between the end portion of the support member close to the open end and the outer edge of the open end along the direction from the third support plate to the cover plate.

[0015] Optionally, the battery cell housing further includes: a bottom plate, which is respectively connected to the first side plate and the second side plate. The bottom plate and the cover plate are oppositely arranged in a third direction, and the third support plate is located on the side of the bottom plate close to the cover plate.

[0016] Optionally, the thickness of the bottom plate is T1, the thickness of the first support plate and the second support plate is T2, the thickness of the third side plate and the fourth side plate is T3, an explosion-proof valve is provided on the cover plate, the maximum pressure that the explosion-proof valve can withstand is P1, the maximum pressure that the connection position between the outer periphery of the cover plate and the open end can withstand is P2, and the maximum pressure that the third side plate and the fourth side plate can withstand is P3. Wherein, T2≤T3<T1, T2 is [0.4T1, 0.75T1], and P1<P2≤P3.

[0017] According to the third aspect of the present application, the battery cell includes: a battery cell shell, which is any of the battery cell shells described above; a winding core, which is installed in the battery cell shell, and the winding core and the battery cell shell are insulated and connected.

[0018] According to the embodiment of the present application, the support member for the battery cell shell is mainly composed of a first support plate, a second support plate and a third support plate. The first support plate and the second support plate are respectively provided with grooves, which can be used to provide strong support to the corners of the roll core during the charging and discharging process, thereby improving the cycle performance and safety of the battery core; the third support plate can provide support for the bottom of the roll core. It can be seen that by cooperating with each other through the first support plate, the second support plate and the third support plate, the support range and support effect for the roll core can be expanded, for example, both sides and one end of the roll core can be supported at the same time. In addition, when the support member in the embodiment of the present application is applied to the battery cell shell, the support member can be installed in the battery cell shell first. Since the support member includes the first support plate, the second support plate and the third support plate, the support member is not easily displaced, which reduces the difficulty of assembly; or the support member and at least one roll core can be assembled first and then installed as a small whole in the battery cell shell, which can also reduce the difficulty of assembly.

[0019] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0021] Figure 1 is a schematic diagram of the three-dimensional structure of a battery cell according to an embodiment of the present application;

[0022] Figure 2 is a partial exploded view of a battery cell according to one embodiment of the present application;

[0023] Figure 3 is a schematic diagram of a partial structure of a battery cell casing according to an embodiment of the present application;

[0024] Figure 4 is a schematic diagram of a partial structure of a battery cell casing according to another embodiment of the present application;

[0025] Figure 5 is a schematic structural diagram of a support member according to an embodiment of the present application;

[0026] Figure 6 is a structural schematic diagram of a support member according to another embodiment of the present application;

[0027] Figure 7 is a schematic diagram of a partial structure of a battery cell housing at one angle according to an embodiment of the present application;

[0028] Figure 8 This is a partial structural schematic diagram of a battery cell casing at another angle according to an embodiment of the present application.

[0029] Figure Numbers

[0030] Battery cell housing 100; receiving space 101; open end 102;

[0031] a first side panel 10;

[0032] a second side plate 20;

[0033] Support member 30; first support plate 31; second support plate 32; third support plate 33; groove 34; groove section 341; through hole 35; protrusion 36;

[0034] Cover plate 40; third side plate 50; fourth side plate 60; bottom plate 70;

[0035] Blue film 80;

[0036] Explosion-proof valve 90;

[0037] Winding core 200; corner portion 201. DETAILED DESCRIPTION

[0038] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0039] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0040] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0041] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0042] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0043] like Figure 5As shown, the support member 30 for the battery cell housing 100 according to the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0044] Specifically, the support member 30 is an integral part, and the support member 30 includes: a first support plate 31, a second support plate 32 and a third support plate 33. The first support plate 31 and the second support plate 32 are arranged opposite to each other in the first direction, and the third support plate 33 is located between the first support plate 31 and the second support plate 32, and is respectively connected to the first support plate 31 and the second support plate 32. The first support plate 31 and the second support plate 32 are respectively provided with at least one groove 34 in their own length direction, and the inner wall surface of each groove 34 is an arc-shaped surface. In the first direction, the grooves 34 on the first support plate 31 and the second support plate 32 form at least one group of groove pairs, and each groove 34 in the groove pair can accommodate an arc-shaped corner portion 201 of the winding core 200. For example, a winding core 200 has a corner portion 201 at each of its left and right ends, and each group of groove pairs includes two grooves 34 that are spaced apart and opposite to each other. The corner portion 201 at the left end of the winding core 200 corresponds to the groove 34 on the first support plate 31, and the corner portion 201 at the right end of the winding core 200 corresponds to the groove 34 on the second support plate 32.

[0045] That is, the support member 30 is a one-piece component, comprising a first support plate 31, a second support plate 32, and a third support plate 33. The first support plate 31 and the second support plate 32 are spaced apart and arranged relative to each other, and the third support plate 33 is connected to the first support plate 31 and the second support plate 32, respectively. For example, the length direction of the first support plate 31 and the second support plate 32 is the vertical direction, the width direction is the front-to-back direction, and the length direction of the third support plate 33 is the left-to-right direction. It is understood that the support member 30 can be a one-piece molded component or a one-piece integrated component. When the support member 30 is an one-piece molded component, the support member 30 can be formed by stamping, drawing, or injection molding, for example, by casting molten aluminum into an integral part. These methods can simplify the manufacturing process and improve the overall integrity. When the support member 30 is an integrated component, the first support plate 31, the second support plate 32, and the third support plate 33 can be connected by fixed connections, detachable connections, or movable connections.

[0046] Among them, any one of the first support plate 31 and the second support plate 32 has a groove 34 opening toward the other, and the grooves 34 on the first support plate 31 and the second support plate 32 form at least one group of groove pairs, and each groove 34 can accommodate an arc-shaped corner portion 201 of the core 200. On the one hand, the grooves 34 on the first support plate 31 and the second support plate 32 correspond to the corner portion 201 of the battery cell. During the battery cell cycle, when the corner portion 201 of the core 200 expands, at least a portion of the inner wall surface of the groove 34 fits with the outer surface of the corner portion 201, thereby supporting the arc-shaped corner portion 201 and alleviating the problem of lithium deposition at the corner portion 201. On the other hand, when the core 200 is mounted on the support member 30, the bottom of the core 200 can be supported by the third support plate 33.

[0047] Furthermore, the number of groove pairs can be one or more groups. For example, the first support plate 31 and the second support plate 32 are provided with multiple grooves 34 along their width directions. The multiple grooves 34 on the first support plate 31 and the second support plate 32 form multiple groups of groove pairs. Each groove pair can correspond to a winding core 200, so that multiple winding cores 200 can be installed, thereby increasing the capacity of the battery cell.

[0048] In addition, the support member 30 is an integral member, for example, the support member 30 is an integrally formed member, which can be formed into an integrally formed member by, for example, stamping, stretching or injection molding, which can simplify the manufacturing process and improve the integrity.

[0049] As can be seen, the support member 30 for the battery cell housing 100 according to the embodiment of the present application is mainly composed of a first support plate 31, a second support plate 32, and a third support plate 33. The first support plate 31 and the second support plate 32 are respectively provided with a groove 34. The groove 34 can be used to provide strong support for the corner portion 201 of the core 200 during the charging and discharging process, thereby improving the cycling performance and safety of the battery cell. The third support plate 33 can provide support for the bottom of the core 200. It can be seen that the mutual cooperation of the first support plate 31, the second support plate 32, and the third support plate 33 can expand the support range and support effect for the core 200. For example, it can simultaneously support both sides and one end of the core 200, achieving position limiting of three areas of the core 200. In addition, when the support member 30 in the embodiment of the present application is applied to the battery cell housing 100, the support member 30 can be installed in the battery cell housing 100 first. Since the support member 30 includes a first support plate 31, a second support plate 32 and a third support plate 33, the support member 30 is not easily displaced, which reduces the difficulty of assembly; or the support member 30 and at least one winding core 200 can be assembled first and then installed as a small whole into the battery cell housing 100, which can also reduce the difficulty of assembly.

[0050] According to one embodiment of the present application, the support member 30 is an insulating member, which can reduce the area requiring additional insulation between the core 200 and the inner wall of the cell housing 100. For example, the narrow left and right sides of the core 200 face the insulating first and second support plates 31 and 32, respectively. In this case, only the large front and rear surfaces of the core 200 require insulating layers to achieve an insulated connection between the core 200 and the cell housing 100. Using plastic for the support member 30 can further reduce its weight.

[0051] In some specific embodiments of the present application, at least one of the first support plate 31, the second support plate 32, and the third support plate 33 has a through hole 35. This not only reduces weight but also facilitates electrolyte outflow, improving the wetting effect. Preferably, the through hole 35 provided on the third support plate 33 effectively improves the wetting effect, allowing the electrolyte to easily enter the interior of the winding core 200 through the through hole 35 on the third support plate 33.

[0052] In some specific embodiments of this application, Figure 6 As shown, the surface of the first support plate 31 or the second support plate 32 has multiple protrusions 36. Adjacent protrusions 36 are spaced apart along the length of the first support plate 31 or the second support plate 32. Each protrusion 36 is provided with a groove segment 341, and multiple groove segments 341 form a groove 34. For example, along the length of the first support plate 31, the inner wall surface of the first support plate 31 has two protrusions 36. The two protrusions 36 are spaced apart along the length of the first support plate 31. Each protrusion 36 has a groove segment 341 extending along the length of the first support plate 31, and the two groove segments 341 form a groove 34. In other words, a single, integrated groove 34 can be divided into multiple groove segments 341. The curved inner wall of each groove segment 341 can support the corner portion 201. Furthermore, the provision of the groove segments 341 can reduce the difficulty of manufacturing the groove 34. Preferably, adjacent protrusions 36 are evenly spaced apart to improve the uniformity of the supporting force distribution.

[0053] like Figures 1 to 8As shown in the figure, the present application further provides a battery cell housing 100. An accommodation space 101 is defined inside the battery cell housing 100. The accommodation space 101 can be used to install a wound core 200 with arc-shaped corner portions 201 provided at both ends. The battery cell housing 100 is provided with an open end 102 communicating with the accommodation space 101. The battery cell housing 100 includes: a first side plate 10 and a second side plate 20, which are oppositely arranged in the second direction; a support member 30, which is the support member 30 in any of the above embodiments. The support member 30 is detachably connected to the first side plate 10 and the second side plate 20 respectively. The first support plate 31, the second support plate 32, the third support plate 33, the first side plate 10 and the second side plate 20 enclose the accommodation space 101; a cover plate 40, which is located at the open end 102 and is used to close the accommodation space 101. Each groove 34 extends in the direction from the third support plate 33 to the cover plate 40.

[0054] In other words, an accommodation space 101 is formed inside the battery cell housing 100 according to the embodiment of the present application. The accommodation space 101 can be used to accommodate the wound core 200. The battery cell housing 100 is provided with an open end 102, and the open end 102 communicates with the accommodation space 101. The wound core 200 can be installed into the interior of the accommodation space 101 through the open end 102. And the accommodation space 101 can be closed by installing the cover plate 40 at the open end 102.

[0055] Specifically, the battery cell housing 100 is mainly composed of a first side plate 10, a second side plate 20, a support member 30 and a cover plate 40. Among them, the support member 30 is mainly composed of a first support plate 31, a second support plate 32 and a third support plate 33. For example, the first support plate 31, the second support plate 32 and the third support plate 33 form a "U"-shaped structure with an opening facing the open end 102. The third support plate 33 is located between the first support plate 31 and the second support plate 32 and is used to connect the first support plate 31 and the second support plate 32. For example, the first side plate 10 and the second side plate 20 are spaced apart in the front-rear direction, the first support plate 31 and the second support plate 32 are spaced apart in the left-right direction, and the third support plate 33 and the open end 102 are spaced apart in the up-down direction.

[0056] It should be noted that the support member 30 is an integral part, that is, the first support plate 31, the second support plate 32 and the third support plate 33 are integrally connected to form an integrated part, or the support member 30 is prepared by an integral molding process, such as formed by stretching, injection molding, etc.

[0057] Among them, the support member 30 is detachably connected to the first side plate 10 and the second side plate 20. After the support member 30 is installed together with the first side plate 10 and the second side plate 20, the first support plate 31, the second support plate 32, the third support plate 33, the first side plate 10 and the second side plate 20 can enclose a semi-closed accommodation space 101.

[0058] Furthermore, either the first support plate 31 or the second support plate 32 has a groove 34 that opens toward the other. That is, each of the first support plate 31 and the second support plate 32 is provided with a groove 34. The depth of each groove 34 can be along the wall thickness of the support member 30, and the length of each groove 34 can extend in the depth direction of the receiving space 101, so as to be consistent with the extension direction of the corner portion 201 of the winding core 200, specifically, from the third support plate 33 toward the open end 102. Furthermore, the opening direction of the groove 34 of the first support plate 31 is toward the location of the second support plate 32, and the opening direction of the groove 34 of the second support plate 32 is toward the location of the first support plate 31. The grooves 34 on the first support plate 31 and the second support plate 32 form at least one pair of grooves.

[0059] Furthermore, when the winding core 200 is installed into the receiving space 101 through the open end 102, each groove 34 can accommodate an arc-shaped corner portion 201 of the winding core 200. For example, the first support plate 31 and the second support plate 32 are spaced apart and distributed along the left and right directions, and the first support plate 31 is defined as the left side plate, and the second support plate 32 is defined as the right side plate. For example, the support member 30 includes a left side plate and a right side plate, and grooves 34 are respectively provided on the left side plate and the right side plate. The opening of the groove 34 of the left side plate faces the position of the right side plate, and the opening of the groove 34 of the right side plate faces the position of the left side plate. The groove 34 of the left side plate and the groove 34 of the right side plate can form a pair of grooves. The groove 34 of the left side plate accommodates the corner portion 201 of the left end of the winding core 200, and the groove 34 of the right side plate accommodates the corner portion 201 of the right end of the winding core 200.

[0060] That is to say, the support member 30 can be used to install a core 200 with arc-shaped corner portions 201 at both ends, and the groove 34 corresponds to the corner portion 201 of the battery cell. During the battery cell cycle, when the corner portion 201 of the core 200 expands, at least a portion of the inner wall surface of the groove 34 is fitted with the outer surface of the corner portion 201, thereby supporting the arc-shaped corner portion 201 and alleviating the problem of lithium deposition at the corner portion 201. Optionally, when the inner wall surface of the groove 34 is completely fitted with the outer surface of the corner portion 201, the curvature of the groove can be the same as the radius of the corner portion 201 of the core 200, so that the corner portion 201 of the core 200 installed in the receiving space 101 can be completely fitted with the inner wall surface of the groove 34. For ease of explanation, the arc-shaped corner portion 201 of the core 200 can be defined as an R angle, and the R angle can be supported by the groove 34. A set of groove pairs includes two grooves 34 , and each groove 34 corresponds to an R angle of the winding core 200 . That is, the total number of the grooves 34 is consistent with the number of R angles of the winding core 200 .

[0061] It is understood that the groove 34 is part of the support member 30 and is directly formed on the inner wall of the first support plate 31 and the second support plate 32. That is, the thickness of one portion of the inner wall of the first support plate 31 or the second support plate 32 is greater than the thickness of another portion, thereby forming the groove 34.

[0062] Furthermore, in this embodiment, the number of groove pairs is not limited; that is, there can be one or more groove pairs, each groove pair corresponding to one winding core 200, and multiple groove pairs corresponding to multiple winding cores 200. Furthermore, by providing the groove pairs, the winding core 200 can be inserted into the groove 34 along the extending direction of the groove 34, thereby improving the assembly efficiency of the winding core 200 and preventing displacement.

[0063] It should be noted that in this embodiment, the support member 30 can be formed into an integrally formed part through stamping, stretching, or injection molding, which can simplify the manufacturing process and improve integrity. For example, if the support member 30 is a plastic part, during manufacturing, the first support plate 31 and the second support plate 32 can be bent at the R portion corresponding to the winding core 200 through an integral injection molding process to form an integrated arc-shaped structure, thereby forming the groove 34. In addition, by providing the groove 34 on the first support plate 31 and the second support plate 32, the processing and formation of the groove 34 is also facilitated.

[0064] In addition, the support member 30 includes a first support plate 31, a second support plate 32, and a third support plate 33, which can simultaneously support the bottom of the core 200 and the corner portion 201 of the core 200, wherein the bottom of the core 200 corresponds to the third support plate 33 and is supported by the third support plate 33, and the corner portion 201 of the core 200 corresponds to the first support plate 31 or the second support plate 32 and is supported thereby. During assembly, the support member 30 can be assembled with the core 200 first, and then the support member 30 can be assembled with the first side plate 10 and the second side plate 20; or the support member 30 can be assembled with the first side plate 10 and the second side plate 20 first, and then the core 200 can be assembled in the receiving space 101. The assembly order is not limited here.

[0065] Furthermore, by adopting the detachable support member 30 , the weight of the support member 30 can be reduced by controlling the material and density of the support member 30 , thereby reducing the weight of the cell case 100 .

[0066] Therefore, according to the embodiment of the present application, the battery cell shell 100 adopts a support member 30, and the support member 30 includes a first support plate 31, a second support plate 32 and a third support plate 33. Grooves 34 are respectively provided on the first support plate 31 and the second support plate 32. The grooves 34 can be used to provide strong support to the corners 201 of the core 200 during the charging and discharging process, thereby preventing the battery cell from being subjected to lithium and sodium deposition problems caused by the lack of restraint caused by the gaps between the corners 201 on both sides during the charging and discharging process; thereby improving the cycle performance and safety of the battery cell; and, through the third support plate 33, it is also possible to provide support to the bottom of the core 200.

[0067] In some specific embodiments of this application, Figure 3 As shown, there are multiple groups of groove pairs, which are arranged in sequence along the direction from the first side plate 10 to the second side plate 20. Each group of groove pairs can correspond to a winding core 200, so that multiple winding cores 200 can be installed to increase the capacity of the battery cell.

[0068] According to one embodiment of the present application, Figure 2 As shown, the battery cell housing 100 further includes: a third side panel 50 and a fourth side panel 60. The third side panel 50 and the fourth side panel 60 are arranged opposite each other in a first direction. The third side panel 50, the fourth side panel 60, the first side panel 10, and the second side panel 20 enclose a channel and an open end 102. The channel communicates with the open end 102, and the support member 30 is mounted in the channel. For example, the first side panel 10 and the second side panel 20 are spaced apart in the front-to-back direction, and the third side panel 50 and the fourth side panel 60 are spaced apart in the left-to-right direction. The third side panel 50 is located to the left of the first support panel 31, and the fourth side panel 60 is located to the right of the second support panel 32. In this embodiment, the third side panel 50, the fourth side panel 60, the first side panel 10, and the second side panel 20 enclose a channel and an open end 102. During assembly, the support member 30 can be mounted in the channel through the open end 102. The third support panel 33 can be positioned near one end of the channel in the axial direction, and the cover panel 40 can be positioned near the other end of the channel in the axial direction. The support member 30 , the first side plate 10 and the second side plate 20 enclose a receiving space 101 .

[0069] In this embodiment, by using the first side plate 10, the second side plate 20, the third side plate 50, and the fourth side plate 60 to cooperate with each other, the efficiency of assembling and disassembling the support member 30 and the structural strength of the battery cell housing 100 are improved.

[0070] In some specific embodiments of this application, Figure 3As shown, the support member 30 is positioned within the channel. Along the direction from the third support plate 33 toward the cover plate 40, the end of the support member 30 closest to the open end 102 is spaced apart from the outer edge of the open end 102. For example, from top to bottom, there is a height difference between the upper end of the support member 30 and the open end 102. After the winding core 200 is installed in the groove 34, one end of the winding core 200 aligns with the third support plate 33, while the other end of the winding core 200 aligns with the cover plate 40, with a height difference between the open end 102 and the upper end. This allows space for plastic, tabs, and other components to be placed on the top of the winding core 200.

[0071] For ease of explanation, Figure 3 As shown, the length of the support member 30 can be defined as H1, and the depth of the receiving space 101 can be defined as H2. Here, the length of the support member 30 and the depth of the receiving space 101 are both measured along the direction from the third support plate 33 toward the open end 102. There is a difference ΔH between H1 and H2, ΔH = H2 - H1, and ΔH ranges from 4mm to 12mm. Because the end of the winding core 200 can be flush with or lower than the end of the support member 30, interference between the support member 30 and the lower plastic of the cover plate 40 and the bottom support plate can be avoided.

[0072] Optionally, the first support plate 31 and / or the second support plate 32 may be hollow structures. That is, either the first support plate 31 alone may be hollow, or the second support plate 32 alone may be hollow, or both the first support plate 31 and the second support plate 32 may be hollow structures. In this embodiment, the hollow structure design can reduce the weight of the battery cell housing 100 while ensuring the weight energy density of the battery cell.

[0073] According to one embodiment of the present application, Figure 4 and Figure 6 As shown, the surface of the first support plate 31 or the second support plate 32 has multiple protrusions 36. Along the direction from the third support plate 33 toward the cover plate 40, adjacent protrusions 36 are spaced apart. Each protrusion 36 is provided with a groove segment 341, and multiple groove segments 341 form a groove 34. For example, along the inner wall surface of the first support plate 31, from top to bottom, there are two protrusions 36. The two protrusions 36 are spaced apart along the vertical direction. Each protrusion 36 is provided with a groove segment 341 distributed from top to bottom, and two groove segments 341 form a groove 34. In other words, the integrated groove 34 can be divided into multiple groove segments 341. The curved inner wall of each groove segment 341 can support the corner portion 201. Moreover, the provision of the groove segments 341 can reduce the difficulty of manufacturing the groove 34. Preferably, adjacent protrusions 36 are evenly spaced apart to improve the uniformity of the distribution of the supporting force.

[0074] The relationship between the groove section 341 and the groove 34 will be described in detail below by taking a groove 34 of the first support plate 31 as an example.

[0075] From bottom to top, a groove 34 is divided into n groove segments 341. Assuming the length of the first support plate 31 is W h , the length of a single groove segment 341 is A hi , where i is a positive integer from 1 to n, for example, A h1 、A h2 、A h3 Respectively represent the length of the first groove segment, the second groove segment and the third groove segment. In addition, the lengths of adjacent groove segments 341 can be the same or different, which is not limited here. The total length of the groove 34 is set to A h , at this time A h =A h1 +A h2 +A h3 +……+A hn . A h / W h The ratio of can be any one of 0.2, 0.30, 0.40, 0.50 or the range between any two of them. In addition, 0.5≤A h / W h ≤0.98, no further details are given here.

[0076] In some specific embodiments of the present application, the battery cell housing 100 further includes a bottom plate 70, which is connected to the first side plate 10 and the second side plate 20, respectively. The bottom plate 70 and the cover plate 40 are arranged relative to each other in the third direction, and the third support plate 33 is located on the side of the bottom plate 70 adjacent to the cover plate 40. For example, the bottom plate 70 is located below the cover plate 40 and below the third support plate 33. In this embodiment, the provision of the bottom plate 70 can improve the support for the bottom of the winding core 200 and simplify the assembly process of the support member 30.

[0077] According to an embodiment of the present application, the thickness of the bottom plate 70 is T1, the thicknesses of the first support plate 31 and the second support plate 32 are T2, the thicknesses of the third side plate 50 and the fourth side plate 60 are T3, an explosion-proof valve 90 is provided on the cover plate 40, the maximum pressure that the explosion-proof valve can withstand is P1, the maximum pressure that the connection position between the outer periphery of the cover plate 40 and the open end 102 can withstand is P2, and the maximum pressure that the third side plate 50 and the fourth side plate 60 can withstand is P3. Wherein, T2 ≤ T3 < T1, T2 is [0.4T1, 0.75T1], and P1 < P2 ≤ P3. For example, T2 is 0.4T1, 0.42T1, 0.54T1, 0.56T1, 0.62T1, 0.66T1, 0.73T1 or 0.75T1, etc. Wherein, the thickness of the bottom plate 70 is the thickness in the third direction, the thicknesses of the first support plate 31 and the second support plate 32 are the thicknesses in the first direction, and the thicknesses of the third side plate 50 and the fourth side plate 60 are also the thicknesses in the first direction.

[0078] It should be noted that by defining T2 ≤ T3 < T1, T2 is [0.4T1, 0.75T1], and P1 < P2 ≤ P3, both the structural strength can be guaranteed and it can be ensured that the setting of the groove 34 is not likely to affect the normal valve opening of the battery cell. In addition, since the groove 34 is an arc-shaped groove, in the width direction of the groove 34, the thickness of the support member 30 corresponding to the middle of the groove 34 is smaller, and the thickness of the support member 30 corresponding to the end of the groove 34 is larger, which can form a structure similar to a reinforcing rib. Not only the structural strength is improved, but the explosion-proof ability of the support member 30 can also be correspondingly improved, so that cracking is not likely to occur at the position of the support member 30 provided with the groove 34 under corresponding safety tests (such as overcharge, thermal runaway, short circuit, extrusion and other safety tests), thereby improving the safety of the battery cell.

[0079] As Figure 1 and Figure 2 shown, the present application also discloses a battery cell, including: a battery cell housing 100 and a wound core 200. The battery cell housing 100 is the battery cell housing 100 in any of the above embodiments, the wound core 200 is installed in the battery cell housing 100, and the wound core 200 and the battery cell housing 100 are insulated and connected. Since the battery cell of the embodiment of the present application includes the battery cell housing 100 in any of the above embodiments, and the battery cell housing 100 of the embodiment of the present application has the advantage of improving the support for the wound core 200, the battery cell of the embodiment of the present application also has the same advantages, such as high safety performance, etc., which will not be elaborated here.

[0080] Optionally, when at least one of the first support plate 31, the second support plate 32, and the third support plate 33 is an insulating member, the corresponding portion of the core 200 may not be provided with insulating material. Specifically, when the entire support member 30 is made of an insulating material, the large surface of the core 200 is covered with an insulating layer, for example, with an insulating PI or PP film. Optionally, the exterior of the cell casing 100 is also covered with a blue film 80.

[0081] In summary, according to the battery cell shell 100 of the embodiment of the present application, the support area for the core 200 can be expanded by adopting the support member 30, which can not only support the corner portion 201 of the core 200, but also support the bottom of the core 200, and also facilitate the assembly of the support member 30.

[0082] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A support member (30) for a battery cell housing (100), characterized in that: The support member (30) is a one-piece member, and the support member (30) comprises: A first support plate (31), a second support plate (32) and a third support plate (33), wherein the first support plate (31) and the second support plate (32) are arranged opposite to each other in a first direction, and the third support plate (33) is located between the first support plate (31) and the second support plate (32), and is connected to the first support plate (31) and the second support plate (32) respectively, and the first support plate (31) and the second support plate (32) are respectively provided with at least one groove (34) in their own length direction, and the inner wall surface of each groove (34) is an arc surface, and in the first direction, the grooves (34) on the first support plate (31) and the second support plate (32) form at least one group of groove pairs, and each groove (34) in the groove pair can accommodate an arc-shaped corner portion (201) of the winding core (200).

2. The support member (30) for the battery cell housing (100) according to claim 1, characterized in that: The supporting member (30) is an insulating member.

3. The support member (30) for the battery cell housing (100) according to claim 1, characterized in that: At least one of the first support plate (31), the second support plate (32) and the third support plate (33) has a through hole (35).

4. The support member (30) for a battery cell housing (100) according to claim 1, characterized in that: The surface of the first support plate (31) or the second support plate (32) has a plurality of protrusions (36), and along the length direction of the first support plate (31) or the second support plate (32), two adjacent protrusions (36) are spaced apart and distributed, each protrusion (36) is provided with a groove segment (341), and a plurality of the groove segments (341) form one groove (34).

5. A battery cell shell (100), characterized in that: The battery cell housing (100) defines a receiving space (101) therein, wherein the receiving space (101) can be used to install a winding core (200) having arc-shaped corner portions (201) at both ends thereof, and the battery cell housing (100) is provided with an open end (102) communicating with the receiving space (101). The battery cell housing (100) comprises: a first side plate (10) and a second side plate (20), wherein the first side plate (10) and the second side plate (20) are arranged opposite to each other in a second direction; A support member (30), wherein the support member (30) is the support member (30) according to any one of claims 1 to 4, wherein the support member (30) is detachable from the first side panel (10) and the second side panel (20), respectively, and the first support panel (31), the second support panel (32), the third support panel (33), the first side panel (10), and the second side panel (20) enclose the receiving space (101); A cover plate (40) is located at the open end (102) and is used to close the receiving space (101), and each of the grooves (34) extends in a direction from the third support plate (33) toward the cover plate (40).

6. The battery cell housing (100) according to claim 5, characterized in that: Also includes: A third side plate (50) and a fourth side plate (60), the third side plate (50) and the fourth side plate (60) are oppositely arranged in the first direction, the third side plate (50), the fourth side plate (60), the first side plate (10) and the second side plate (20) enclose a channel and the open end (102), the channel communicates with the open end (102), and the support member (30) is installed in the channel.

7. The battery cell housing (100) according to claim 6, characterized in that: The support member (30) is located in the channel. Along the direction from the third support plate (33) to the cover plate (40), there is a gap between the end of the support member (30) close to the open end (102) and the outer edge of the open end (102).

8. The battery cell housing (100) according to claim 6, characterized in that Further comprising: A bottom plate (70), the bottom plate (70) is respectively connected to the first side plate (10) and the second side plate (20), the bottom plate (70) and the cover plate (40) are oppositely arranged in the third direction, and the third support plate (33) is located on the side of the bottom plate (70) close to the cover plate (40).

9. The battery cell housing (100) according to claim 8, characterized in that: The thickness of the bottom plate (70) is T1, the thicknesses of the first support plate (31) and the second support plate (32) are T2, the thicknesses of the third side plate (50) and the fourth side plate (60) are T3, an explosion-proof valve (90) is provided on the cover plate (40), the maximum pressure that the explosion-proof valve can withstand is P1, the maximum pressure that the connection position of the outer periphery of the cover plate (40) and the open end (102) can withstand is P2, and the maximum pressure that the third side plate (50) and the fourth side plate (6) can withstand is P3. Wherein, T2 ≤ T3 < T1, T2 is [0.4T1, 0.75T1], and P1 < P2 ≤ P3.

10. A battery cell, characterized in that: Comprising: A battery cell housing (100), the battery cell housing (l00) is the battery cell housing (100) according to any one of claims 5-9; A wound core (200), the wound core (200) is installed in the battery cell housing (100), and the wound core (200) and the battery cell housing (100) are insulated and connected.

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