Carrying Component and Battery Cell with Liquid Injection Structure

Abstract

This application relates to the field of battery technology, and in particular, to a carrying component and an electric core with a liquid injection structure. The carrying component with a liquid injection structure includes: a carrying member and an insulating member; wherein, along a first preset direction, the carrying member is formed with a liquid injection through hole penetrating through both of its sides; the insulating member is formed with a buffer groove, and along the first preset direction, the buffer groove is correspondingly arranged and communicated with the liquid injection through hole; a liquid injection channel is formed in the groove wall of the buffer groove, and the liquid injection channel penetrates through the groove wall of the buffer groove. The carrying component with a liquid injection structure provided by this application is provided with a buffer groove on the insulating member, and a through liquid injection channel is formed in the groove wall of the buffer groove, which plays a role in buffering the electrolyte, thereby avoiding the impact of the electrolyte on the electrode group during the liquid injection process, and effectively avoiding the damage of the electrode sheet.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a load-bearing component and a battery cell with a liquid injection structure. Background Art

[0002] At present, with the rapid development of new energy batteries, the structures of battery cell bearing components are also various, and the main structure of the battery cell bearing component is composed of components such as plain aluminum plate, upper plastic, pole, plain aluminum plate and lower plastic. The battery cell needs to be injected with liquid after the formation process. Therefore, injection holes are usually opened on the battery cell bearing component. During the injection process, the electrolyte completes the infiltration of the battery cell electrode group through the injection holes on the battery cell bearing component. In this process, the electrolyte mainly passes through the two injection holes on the plain aluminum plate and the lower plastic in the battery cell bearing component. Therefore, the optimization of the structure here plays a vital role in the injection process.

[0003] In the current battery cell injection process, the lower plastic part below the injection hole of the bare aluminum plate usually adopts a through-hole structure. For the through-hole structure, during the injection process, the electrolyte will impact the electrode group and cause damage to the electrode. Summary of the invention

[0004] The purpose of the present application is to provide a bearing assembly and a battery cell with a liquid injection structure, which to a certain extent solves the technical problem that the lower plastic part below the liquid injection hole of the bare aluminum plate of the battery cell in the prior art usually adopts a through-hole structure. For the through-hole structure, during the liquid injection process, the electrolyte will impact the electrode group and cause damage to the electrode piece.

[0005] The present application provides a bearing component with a liquid injection structure, comprising: a bearing member and an insulating member; wherein, along a first preset direction, the bearing member is formed with a liquid injection through hole running through both sides thereof; the insulating member is formed with a buffer groove, and along the first preset direction, the buffer groove is arranged corresponding to and communicated with the liquid injection through hole; the groove wall of the buffer groove is provided with a liquid injection channel, and the liquid injection channel runs through the groove wall of the buffer groove.

[0006] In the above technical solution, further, along the first preset direction, the projection of the injection channel and the projection of the electrode lug of the battery cell electrode group are staggered.

[0007] In any of the above technical solutions, further, the injection channel is formed at the junction of the bottom wall and the side wall of the buffer groove.

[0008] In any of the above technical solutions, further, a portion of the injection channel is formed on the bottom wall of the buffer groove, and another portion of the injection channel is formed on the side wall of the buffer groove.

[0009] In any of the above technical solutions, further, a plurality of the liquid injection channels are sequentially arranged at intervals along the circumferential direction of the buffer groove.

[0010] In any of the above technical solutions, further, along the first preset direction, an inlet liquid guiding inclined surface is formed at the inlet end of the liquid injection channel close to the liquid injection through hole.

[0011] In any of the above technical solutions, further, the angle of the inlet liquid guiding inclined surface is θ1, and 30° < θ1 < 80°.

[0012] In any of the above technical solutions, further, along the first preset direction, an outlet liquid guiding inclined surface is formed at the outlet end of the liquid injection channel far from the liquid injection through hole.

[0013] In any of the above technical solutions, further, the angle of the outlet liquid guiding inclined surface is θ2, and 30° < θ2 < 80°.

[0014] In any of the above technical solutions, further, a plurality of the liquid injection channels are sequentially arranged at intervals along the circumferential direction of the buffer groove.

[0015] In any of the above technical solutions, further, the liquid injection channel is strip-shaped and extends along the length direction of the groove wall of the corresponding buffer groove.

[0016] In any of the above technical solutions, further, at least one side wall of the buffer groove is inclined and is arranged in a tapered manner along the first preset direction and from the bearing member towards the insulating member.

[0017] In any of the above technical solutions, further, at least one of the liquid injection channels extends along the length direction of the insulating member and / or at least one of the liquid injection channels extends along the width direction of the insulating member.

[0018] In any of the above technical solutions, further, along the first preset direction, the ratio of the total projected area of all the liquid injection channels to the area of the liquid injection through hole is m, and m ≥ 1.2.

[0019] The present application also provides an electric core, including the bearing assembly with the liquid injection structure according to any of the above technical solutions. Therefore, it has all the beneficial technical effects of the bearing assembly with the liquid injection structure, which will not be elaborated herein.

[0020] Compared with the prior art, the beneficial effects of the present application are as follows:

[0021] The carrier assembly with a liquid injection structure provided by the present application has a buffer groove provided on an insulating member, and a through liquid injection channel is provided on the groove wall of the buffer groove, which plays a role in buffering the electrolyte, thereby avoiding the impact of the electrolyte on the electrode group during the liquid injection process, and effectively avoiding damage to the electrode sheet. Description of the Drawings

[0022] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 It is an exploded view of the carrier assembly with a liquid injection structure provided by an embodiment of the present application;

[0024] Figure 2 It is a schematic structural diagram of the insulating member provided by an embodiment of the present application;

[0025] Figure 3 is Figure 2 An enlarged structural diagram at A;

[0026] Figure 4 It is another schematic structural diagram of the insulating member provided by an embodiment of the present application;

[0027] Figure 5 It is yet another schematic structural diagram of the insulating member provided by an embodiment of the present application;

[0028] Figure 6 is Figure 5 A cross-sectional view along the B-B interface.

[0029] Reference Signs:

[0030] 1 - Cover plate, 11 - Liquid injection through hole, 2 - Insulating member, 21 - Buffer groove, 211 - Bottom wall, 212 - Side wall, 22 - Liquid injection channel, 221 - Inlet liquid guiding inclined surface, 222 - Outlet liquid guiding inclined surface. Detailed Embodiments

[0031] The following will clearly and completely describe the technical solutions of the present application with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application.

[0032] The components of the embodiments of the present application that are usually depicted and shown in the accompanying drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application.

[0033] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0034] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0035] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0036] Next, refer to Figures 1 to 6 Describe a carrier assembly and an electric core having a liquid injection structure according to some embodiments of the present application.

[0037] Embodiment 1

[0038] Refer to Figures 1 to 6 As shown, an embodiment of the present application provides a carrier assembly having a liquid injection structure, including: a carrier member and an insulating member 2; wherein, preferably, the carrier member is the cover plate 1 of the electric core, and will also be described by way of example hereinafter. The carrier member can also be the housing of the electric core, etc., and is specifically designed according to actual needs; along the first preset direction a, the cover plate 1 is formed with a liquid injection through hole 11 penetrating through both sides thereof; the insulating member 2 is formed with a buffer groove 21, and along the first preset direction a, the buffer groove 21 is correspondingly arranged and communicated with the liquid injection through hole 11; a liquid injection channel 22 is formed on the groove wall of the buffer groove 21, and the liquid injection channel 22 penetrates through the groove wall of the buffer groove 21.

[0039] According to the structure described above, the load-bearing component with an injection structure provided in the present application has a buffer groove 21 arranged on the insulating component 2, and a through injection channel 22 is opened on the groove wall of the buffer groove 21, which plays a role in buffering the electrolyte, thereby preventing the electrolyte from impacting the electrode group during the injection process, thereby effectively preventing damage to the electrode sheet.

[0040] Further, preferably, the first preset direction a is the thickness direction of the cover plate 1 and the lower insulating member 2. Of course, it is not limited thereto.

[0041] In this embodiment, preferably, along the first preset direction a, the projection of the injection channel 22 and the projection of the electrode lug of the battery cell electrode group are staggered.

[0042] According to the structure described above, it can be seen that the electrode ears of the electrode group will not block the aforementioned liquid injection channel 22, so that the electrolyte will not overflow.

[0043] In this embodiment, preferably, Figure 3 and Figure 6 As shown, the injection channel 22 is formed at the junction of the bottom wall 211 and the side wall 212 of the buffer groove 21 .

[0044] According to the structure described above, the injection channel 22 is designed around the buffer groove 21, which can guide the electrolyte to flow to the designated area without causing impact on the electrode group. At the same time, it can also effectively avoid the electrode ears of the open electrode group to prevent the electrode ears from blocking the injection channel 22.

[0045] In this embodiment, preferably, Figure 3 and Figure 6 As shown, for each injection channel 22 , a portion of the injection channel 22 is formed on the bottom wall 211 of the buffer groove 21 , and another portion of the injection channel 22 is formed on the side wall 212 of the buffer groove 21 .

[0046] According to the structure described above, a part of the injection channel 22 is arranged on the bottom wall 211 of the buffer groove 21, and another part of the injection channel 22 is arranged on the side wall 212 of the buffer groove 21, which increases the length of the injection channel 22 and further plays a buffering role.

[0047] It should be noted that: it is not limited to the above "for each liquid injection channel 22, a part of the liquid injection channel 22 is formed on the bottom wall 211 of the buffer groove 21, and the other part of the liquid injection channel 22 is formed on the side wall 212 of the buffer groove 21". The liquid injection channel 22 can also be arranged at other positions. That is to say, the liquid injection channel 22 is not limited to being formed at the junction of the bottom wall 211 and the side wall 212 of the buffer groove 21. For example: for each liquid injection channel 22, the liquid injection channel 22 can also be only formed on the bottom wall 211 of the buffer groove 21, or for each liquid injection channel 22, the liquid injection channel 22 can also be only formed on the side wall 212 of the buffer groove 21, etc.

[0048] In this embodiment, preferably, as Figure 4 shown, the number of the liquid injection channels 22 is multiple, and they are sequentially arranged along the circumferential direction of the buffer groove 21.

[0049] According to the structure described above, multiple liquid injection channels 22 are sequentially arranged along the circumferential direction of the buffer groove 21, which improves the liquid injection efficiency.

[0050] Furthermore, preferably, as Figure 4 shown, the multiple liquid injection channels 22 are sequentially arranged at intervals along the circumferential direction of the buffer groove 21. It can be seen that the liquid injection channels 22 arranged at intervals can further play a role in buffering the electrolyte and are also convenient for processing and manufacturing. It should be noted that: along the circumferential direction of the buffer groove 21, the multiple sequentially arranged liquid injection channels 22 can also be connected into one, that is, a circular liquid injection channel 22 is formed.

[0051] Furthermore, preferably, the number of the liquid injection channels 22 is three. The main reason is that the buffer groove 21 has four side walls 212, and one of them is close to the tab. Therefore, only the junction of this side wall 212 and the bottom wall 211 is not provided with a buffer channel, and a liquid injection channel 22 is provided at the junction of the other three side walls 212 and the bottom wall 211. Of course, the number and distribution of the liquid injection channels 22 are not limited to this. For example: the number of the liquid injection channels 22 can also be less than three, such as one or two, the number of the liquid injection channels 22 can also be more than three, such as four or five, etc. Moreover, not only one liquid injection channel 22 is provided on each side wall 212, but also more than one, such as two or three, etc. In addition, the number of the side walls 212 of the liquid injection groove is not limited to this, and can also be less than four, such as three or one, such as a circular side wall 212, and the number of the side walls 212 of the liquid injection groove can also be more than four, such as five or six, etc.

[0052] In addition, it should be noted that: in this embodiment, for any one of the liquid injection channels 22, it is formed at the junction of the bottom wall 211 and the side wall 212 of the buffer groove 21. That is to say, for any one of the liquid injection channels 22, a part of each buffer groove 21 is formed on the bottom wall 211 of the buffer groove 21, and the other part is formed on the side wall 212 of the buffer groove 21.

[0053] Of course, it is not limited to this, and other structures can also be adopted. For example: for any one of the liquid injection channels 22, it is only formed on the bottom wall 211 of the buffer groove 21, or for any one of the liquid injection channels 22, it is only formed on the side wall 212 of the buffer groove 21, or at least one of the liquid injection channels 22 is completely formed on the bottom wall 211 of the buffer groove 21, and at the same time at least one of the liquid injection channels 22 is completely formed on the side wall 212 of the buffer groove 21, etc., and specific selection is made according to actual needs.

[0054] In this embodiment, preferably, as Figure 6 shown, along the first preset direction a, an inlet liquid guiding slope 221 is formed at the inlet end of the liquid injection channel 22 close to the liquid injection through hole 11, and it is arranged in a tapered shape from the outside to the inside of the lower insulating member 2 along the first preset direction a.

[0055] According to the structure described above, the inlet liquid guiding slope 221 prevents poor flow inside the groove when the liquid injection amount is large, resulting in accumulation and causing deformation of the insulating member 2.

[0056] In this embodiment, preferably, as Figure 6 shown, along the first preset direction a, an outlet liquid guiding slope 222 is formed at the outlet end of the liquid injection channel 22 far from the liquid injection through hole 11, and it is arranged in a tapered shape from the outside to the inside of the lower insulating member 2 along the first preset direction a.

[0057] According to the structure described above, the outlet liquid guiding slope 222 prevents poor flow inside the groove when the liquid injection amount is large, resulting in accumulation and causing deformation of the insulating member 2.

[0058] In this embodiment, preferably, as Figure 6 shown, the angle of the inlet liquid guiding slope 221 is θ1, and 30° < θ1 < 80°; the angle of the outlet liquid guiding slope 222 is θ2, and 30° < θ2 < 80°.

[0059] According to the structure described above, when the angle θ1 of the inlet liquid guiding slope 221 is too large, the flow rate of the electrolyte is too fast, which will still cause a certain degree of impact on the lower electrode group. When the angle θ1 of the inlet liquid guiding slope 221 is too small, it affects the liquid injection speed and efficiency. Therefore, the angle θ1 of the inlet liquid guiding slope 221 is taken between 30° and 80°;

[0060] When the angle θ2 of the liquid outlet guiding inclined plane 222 is too large, the flow rate of the electrolyte is too fast, which will still cause a certain degree of impact on the lower electrode group. When the angle θ2 of the liquid outlet guiding inclined plane 222 is too small, the liquid injection speed and efficiency are affected. Therefore, the angle θ2 of the liquid outlet guiding inclined plane 222 is preferably between 30° and 80°.

[0061] For further illustration, the following multiple groups of experiments can be conducted to obtain a relationship table between the angle θ1 of the liquid inlet guiding inclined plane 221, the angle θ2 of the liquid outlet guiding inclined plane 222, and the buffering condition of the electrolyte during the liquid injection process.

[0062] Table 1 Relationship table between the angle θ1 of the liquid inlet guiding inclined plane 221, the angle θ2 of the liquid outlet guiding inclined plane 222, and the buffering condition of the electrolyte during the liquid injection process

[0063]

[0064] Combined with the above table, it can be seen that the angle θ1 of the liquid inlet guiding inclined plane 221 needs to be between 30° and 80°; the angle θ2 of the liquid outlet guiding inclined plane 222 needs to be between 30° and 80°. In this way, while ensuring rapid drainage, it will not cause impact on the electrode group, that is, while ensuring the liquid injection efficiency, the electrode tabs of the electrode group can be effectively protected.

[0065] In this embodiment, preferably, as Figure 4 shown, there are two liquid injection channels 22 extending along the length direction of the insulating member 2. At the same time, there is one liquid injection channel 22 extending along the width direction of the insulating member 2. That is to say, for each liquid injection channel 22 provided on each groove wall, this liquid injection channel 22 extends along the length direction of the corresponding groove wall to form a strip-shaped liquid injection channel 22. It should be noted that: the liquid injection channel 22 is not limited to a strip-shaped structure. The liquid injection channel 22 can also be circular, and multiple circular liquid injection channels 22 are sequentially and spacedly arranged on the same groove wall. Of course, the circular liquid injection channel 22 is only an example, and the liquid injection channel 22 can also be other shapes, which are specifically designed according to actual needs.

[0066] According to the structure described above, for the two side walls 212 of the liquid injection groove provided along the length direction of the insulating member 2, a liquid injection channel 22 as described above is formed at the intersection of each side wall 212 and the bottom wall 211, and these two liquid injection channels 22 extend along the length direction of the insulating member 2; for one side wall 212 of the liquid injection groove provided along the width direction of the insulating member 2, a gas guiding channel as described above is formed, and this liquid injection channel 22 extends along the width direction of the insulating member 2. This structure enables multiple liquid injection channels 22 to be sequentially and spacedly arranged along the circumferential edge of the buffer groove 21.

[0067] Of course, the extending direction of the liquid injection channel 22 is not limited to the above, and is specifically determined according to the setting of the side wall 212 of the buffer groove 21.

[0068] In this embodiment, preferably, as Figure 1 and Figure 2 shown, at least one side wall 212 of the buffer groove 21 is inclined and is arranged in a tapered manner along the first preset direction a and from the cover plate 1 towards the insulating member 2, which plays a role in guiding, buffering and increasing the volume of the buffer groove 21, and further improves the buffering effect on the electrolyte.

[0069] In this embodiment, preferably, as Figure 1 and Figure 2 shown, along the first preset direction, the ratio of the total projected area of all the liquid injection channels 22 to the area of the liquid injection through hole 11 is m, and m≥1.2.

[0070] According to the structure described above, if the ratio m of the total projected area of all the liquid injection channels 22 to the area of the liquid injection through hole 11 is too small, liquid overflow will occur during the liquid injection process. Therefore, it is necessary to make m≥1.2.

[0071] For further illustration, the following multiple groups of experiments can be carried out to obtain a relationship table between the ratio m of the total projected area of the liquid injection channels 22 to the area of the liquid injection through hole 11 and the buffering situation of the electrolyte during the liquid injection process.

[0072] Table 2 Relationship table between the ratio m of the total area of the liquid injection channels to the area of the liquid injection through hole and the buffering situation of the electrolyte during the liquid injection process

[0073]

[0074] Combined with the above table, it can be seen that by making the ratio m of the total projected area of all the liquid injection channels 22 to the area of the liquid injection through hole 11 ≥1.2, the occurrence of liquid overflow during the liquid injection process can be avoided.

[0075] It should be noted that: below the insulating member 2 is the battery cell diaphragm. During the battery cell assembly process, there will be a situation where part of the battery cell diaphragm partially blocks the liquid injection channel 22. Therefore, the total area of all the liquid injection channels 22 needs to be greater than the area of the liquid injection through hole 11 to prevent liquid overflow during the liquid injection process.

[0076] Embodiment 2

[0077] Embodiment 2 of the present application further provides a battery cell, including the carrying component with the liquid injection structure described in Embodiment 1 above. Therefore, it has all the beneficial technical effects of the carrying component with the liquid injection structure, and the same technical features and beneficial effects will not be repeated.

[0078] In this embodiment, the carrier assembly with a liquid injection structure is the cover plate 1 of the battery cell. It should be noted that: along the first preset direction a, an opening is formed at one end of the housing, and the aforementioned cover plate assembly is installed only at this open end, that is to say, the aforementioned cover plate 1 is installed only at this open end of the housing, or along the first preset direction a, openings are formed at both ends of the housing, and the aforementioned carrier assembly with a liquid injection structure is installed only at one open end or both open ends of the housing simultaneously, that is to say, the aforementioned cover plate 1 is installed only at one open end or both open ends of the housing simultaneously, which is specifically designed according to actual needs.

[0079] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A bearing assembly with a liquid injection structure, characterized in that: include: A load-bearing member and an insulating member; wherein, along a first preset direction, the load-bearing member is formed with injection holes penetrating through both sides thereof; the insulating member is formed with a buffer groove, and along the first preset direction, the buffer groove is arranged correspondingly to and communicated with the injection holes; a groove wall of the buffer groove is provided with an injection channel, and the injection channel penetrates the groove wall of the buffer groove; Along the first preset direction, the projection of the injection channel and the projection of the pole lug of the battery cell pole group are staggered; The injection channel is formed at the junction of the bottom wall and the side wall of the buffer groove; A portion of the injection channel is formed on the bottom wall of the buffer groove, and another portion of the injection channel is formed on the side wall of the buffer groove; along the first preset direction, an inlet liquid guiding slope is formed at the inlet end of the injection channel close to the injection through hole; The angle of the inlet liquid guiding slope is θ1, and 30°<θ1<80°; Along the first preset direction, an outlet liquid guiding slope is formed at the outlet end of the injection channel away from the injection through hole; The angle of the outlet liquid guiding slope is θ2, and 30°<θ2<80°.

2. The bearing assembly with a liquid injection structure according to claim 1, characterized in that: The plurality of injection channels are sequentially spaced along the circumference of the buffer groove; and / or The injection channel is in the shape of an elongated strip and extends along the length direction of the groove wall of the corresponding buffer groove; and / or At least one side wall of the buffer groove is inclined and is arranged along the first preset direction and in a tapered manner from the bearing member toward the insulating member; and / or At least one of the injection channels extends along the length direction of the insulating member and / or at least one of the injection channels extends along the width direction of the insulating member; and / or Along the first preset direction, the ratio of the total area of ​​the projections of all the injection channels to the area of ​​the injection through hole is m, and m≥1.

2.

3. A battery cell, characterized in that: The invention comprises a load-bearing assembly with a liquid injection structure as claimed in any one of claims 1 to 2, wherein the load-bearing member is a cover plate or a shell.

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