Bearing assembly with liquid injection structure and battery cell

Abstract

The invention relates to the technical field of batteries, in particular to a bearing assembly with a liquid injection structure and a battery cell, and the bearing assembly with the liquid injection structure comprises a bearing component and an insulating component; a liquid injection through hole penetrating through the two sides of the bearing component is formed in the bearing component in the first preset direction; a buffer groove is formed in the insulating component, and the buffer groove and the liquid injection through hole are correspondingly arranged and communicate with each other in the first preset direction; a liquid injection channel is formed in the groove wall of the buffering groove and penetrates through the groove wall of the buffering groove. According to the bearing assembly with the liquid injection structure, the buffer groove is formed in the insulating component, and the through liquid injection channel is formed in the groove wall of the buffer groove, so that an electrolyte buffer effect is achieved, impact of the electrolyte on a pole group in the liquid injection process can be avoided, and damage to a pole piece can be effectively avoided.

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 injection channels are sequentially spaced along the circumference of the buffer groove.

[0010] In any of the above technical solutions, further, 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.

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

[0012] In any of the above technical solutions, further, 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.

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

[0014] In any of the above technical solutions, further, a plurality of the injection channels are sequentially spaced along the circumference of the buffer groove.

[0015] In any of the above technical solutions, further, 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.

[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 toward the insulating member.

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

[0018] In any of the above technical solutions, further, 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.

[0019] The present application also provides a battery cell, comprising a carrier assembly with a liquid injection structure as described in any of the above technical solutions. Therefore, all the beneficial technical effects of the carrier assembly with a liquid injection structure are not repeated here.

[0020] Compared with the prior art, the beneficial effects of this application are: The load-bearing assembly with a liquid injection structure provided in the present application is provided with a buffer groove on the insulating component, and a through liquid injection channel is opened in the groove wall of the buffer groove, which plays a role in buffering the electrolyte, thereby preventing the electrolyte from impacting the electrode group during the liquid injection process, thereby effectively avoiding damage to the electrode sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 An exploded view of a bearing assembly with a liquid injection structure provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of the insulating component provided in an embodiment of the present application; Figure 3 for Figure 2 A schematic diagram of the enlarged structure at A; Figure 4 Another schematic diagram of the structure of the insulating component provided in the embodiment of the present application; Figure 5 Another structural schematic diagram of the insulating component provided in the embodiment of the present application; Figure 6 for Figure 5 Cross-sectional view along the BB interface.

[0023] Reference numerals: 1-cover plate, 11-liquid injection through hole, 2-insulating component, 21-buffering groove, 211-bottom wall, 212-side wall, 22-liquid injection channel, 221-inlet liquid guiding slope, 222-outlet liquid guiding slope. DETAILED DESCRIPTION

[0024] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0025] The components of the embodiments of the present application generally described and shown in the 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 drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0026] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0027] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] Refer to the following Figures 1 to 6 The present invention describes a carrier assembly and a battery cell with a liquid injection structure according to some embodiments of the present application.

[0030] Embodiment 1 See also Figures 1 to 6 As shown, an embodiment of the present application provides a load-bearing component with an injection structure, including: a load-bearing member and an insulating member 2; wherein, preferably, the load-bearing member is a cover plate 1 of a battery cell, which will be explained in turn in the following text as examples, and the load-bearing member may also be a shell of a battery cell, etc., which is specifically designed according to actual needs; along a first preset direction a, the cover plate 1 is formed with a liquid injection through hole 11 running 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 arranged corresponding to and communicated with the liquid injection through hole 11; a liquid injection channel 22 is opened on the groove wall of the buffer groove 21, and the liquid injection channel 22 runs through the groove wall of the buffer groove 21.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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. 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 . 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.

[0035] 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 . 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.

[0036] It should be noted that: it is not limited to the above-mentioned "for each injection channel 22, a part of the injection channel 22 is formed on the bottom wall 211 of the buffer groove 21, and the other part of the injection channel 22 is formed on the side wall 212 of the buffer groove 21", and the injection channel 22 can also be set at other positions. That is to say, the 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 injection channel 22, the injection channel 22 can also be formed only on the bottom wall 211 of the buffer groove 21, or for each injection channel 22, the injection channel 22 can also be formed only on the side wall 212 of the buffer groove 21, etc.

[0037] In this embodiment, preferably, Figure 4 As shown, there are multiple injection channels 22 , which are sequentially arranged along the circumference of the buffer groove 21 . According to the structure described above, it can be known that a plurality of injection channels 22 are sequentially arranged along the circumference of the buffer groove 21 to improve the injection efficiency.

[0038] Further, preferably, Figure 4 As shown, a plurality of injection channels 22 are sequentially arranged at intervals along the circumference of the buffer groove 21. It can be seen that the injection channels 22 arranged at intervals can further play a role in buffering the electrolyte and are easy to process and manufacture. It should be noted that: along the circumference of the buffer groove 21, a plurality of injection channels 22 arranged sequentially can also be connected to form one, that is, to form an annular injection channel 22. Further, preferably, the number of injection channels 22 is three, mainly because the buffer groove 21 has four side walls 212, one of which is arranged close to the pole ear, so only the junction of this side wall 212 and the bottom wall 211 is not provided with a buffer channel, while the junctions of the other three side walls 212 and the bottom wall 211 are provided with an injection channel 22. Of course, the number and distribution of the injection channels 22 are not limited to this, for example: the number of injection channels 22 can also be less than three, such as one or two, the number of injection channels 22 can also be greater than three, such as four or five, etc., and each side wall 212 is not limited to only one injection channel 22, and more than one, such as two or three, etc. can also be provided. In addition, the number of side walls 212 of the 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 side walls 212 of the liquid groove can also be greater than four, such as five or six, etc.

[0039] In addition, it should be noted that: in the present embodiment, for any injection channel 22, it is formed at the junction of the bottom wall 211 and the side wall 212 of the buffer groove 21, that is, for any injection channel 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.

[0040] Of course, not limited to this, other structures may also be used, for example: for any one of the injection channels 22, it is only formed on the bottom wall 211 of the buffer groove 21, or for any one of the injection channels 22, it is only formed on the side wall 212 of the buffer groove 21, or at least one of the injection channels 22 is completely formed on the bottom wall 211 of the buffer groove 21, and at least one of the injection channels 22 is completely formed on the side wall 212 of the buffer groove 21, and so on, the specific selection is based on actual needs. In this embodiment, preferably, Figure 6 As shown, along the first preset direction a, an inlet liquid guiding slope 221 is formed at the inlet end of the injection channel 22 close to the injection through hole 11, and is gradually arranged from the outer side of the lower insulating component 2 toward the inner side thereof along the first preset direction a. According to the structure described above, the inlet liquid guiding slope 221 prevents the liquid from flowing poorly inside the groove when the injection amount is large, thereby forming accumulation and causing deformation of the insulating component 2. In this embodiment, preferably, Figure 6 As shown, along the first preset direction a, an outlet liquid guiding slope 222 is formed at the outlet end of the injection channel 22 away from the injection through hole 11, and is gradually arranged from the outer side of the lower insulating component 2 toward the inner side thereof along the first preset direction a. According to the structure described above, the outlet liquid guiding slope 222 prevents the liquid from flowing poorly inside the groove when the injection amount is large, thereby forming accumulation and causing deformation of the insulating component 2.

[0041] In this embodiment, preferably, Figure 6 As 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°.

[0042] According to the structure described above, when the angle θ1 of the inlet liquid guiding slope 221 is too large, the electrolyte flow rate is too fast, which will still cause a certain degree of impact on the electrode group below. When the angle θ1 of the inlet liquid guiding slope 221 is too small, the injection speed and efficiency are affected, and thus the angle θ1 of the inlet liquid guiding slope 221 is set to a value between 30° and 80°. When the angle θ2 of the outlet liquid guide slope 222 is too large, the electrolyte flow rate is too fast, which will still cause a certain degree of impact on the electrode group below. When the angle θ2 of the outlet liquid guide slope 222 is too small, the injection speed and efficiency are affected, and the angle θ2 of the outlet liquid guide slope 222 is set to a value between 30° and 80°.

[0043] For further explanation, the following multiple tests can be performed to obtain a relationship table between the angle θ1 of the inlet liquid guiding slope 221, the angle θ2 of the outlet liquid guiding slope 222 and the buffering condition of the electrolyte during the liquid injection process.

[0044] Table 1 Relationship between the angle θ1 of the inlet liquid guiding slope 221, the angle θ2 of the outlet liquid guiding slope 222 and the buffering condition of the electrolyte during the injection process

[0045] Combined with the above table, it can be seen that the angle θ1 of the inlet liquid guide slope 221 needs to be between 30° and 80°; the angle θ2 of the outlet liquid guide slope 222 needs to be between 30° and 80°, so as to ensure rapid drainage without causing impact on the electrode group, that is, while ensuring the injection efficiency, the electrode ears of the electrode group can be effectively protected.

[0046] In this embodiment, preferably, Figure 4As shown, there are two injection channels 22 extending along the length direction of the insulating member 2, and at the same time, there is an injection channel 22 extending along the width direction of the insulating member 2, that is, for each injection channel 22 arranged on the groove wall, the injection channel 22 extends along the length direction of the corresponding groove wall to form a long strip of injection channel 22. It should be noted that the injection channel 22 is not limited to a long strip structure, the injection channel 22 can also be circular, and a plurality of circular injection channels 22 arranged in sequence and at intervals are arranged on the same groove wall. Of course, the circular injection channel 22 is only an example, and the injection channel 22 can also be other shapes, which are designed according to actual needs. According to the structure described above, the two side walls 212 of the injection groove arranged along the length direction of the insulating member 2, each of the two side walls 212 and the bottom wall 211 are formed with the aforementioned injection channel 22 at the junction, and the two injection channels 22 extend along the length direction of the insulating member 2; one side wall 212 of the injection groove arranged along the width direction of the insulating member 2 is formed with the aforementioned air guide channel, and the injection channel 22 extends along the width direction of the insulating member 2. This structure allows multiple injection channels 22 to be sequentially spaced along the circumferential edge of the buffer groove 21.

[0047] Of course, the extension direction of the injection channel 22 is not limited to the above, and it depends on the setting of the side wall 212 of the buffer groove 21.

[0048] In this embodiment, preferably, Figure 1 and Figure 2 As 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 toward the insulating component 2, playing the role of guiding, buffering and increasing the volume of the buffer groove 21, further enhancing the buffering effect on the electrolyte.

[0049] In this embodiment, preferably, Figure 1 and Figure 2 As shown, along the first preset direction, the ratio of the total area of ​​the projections of all the injection channels 22 to the area of ​​the injection through hole 11 is m, and m≥1.2.

[0050] According to the structure described above, if the ratio m of the total projected area of ​​all injection channels 22 to the area of ​​the injection through hole 11 is too small, overflow will occur during the injection process, and therefore m needs to be ≥ 1.2.

[0051] For further explanation, the following multiple tests can be performed to obtain a relationship table between the ratio m of the total projected area of ​​the injection channel 22 to the area of ​​the injection hole 11 and the buffering condition of the electrolyte during the injection process.

[0052] Table 2 Relationship between the ratio m of the total area of ​​the injection channel to the area of ​​the injection hole and the buffering condition of the electrolyte during the injection process

[0053] According to the above table, the ratio m of the total area of ​​the projections of all the injection channels 22 to the area of ​​the injection through hole 11 is set to be ≥ 1.2 to avoid overflow during the injection process.

[0054] It should be noted that: below the insulating component 2 is the battery cell diaphragm. During the battery cell assembly process, part of the battery cell diaphragm will partially block the injection channel 22. Therefore, the total area of ​​all injection channels 22 needs to be larger than the area of ​​the injection hole 11 to prevent overflow during the injection process.

[0055] Embodiment 2 Embodiment 2 of the present application further provides a battery cell, comprising the carrier assembly with the liquid injection structure described in the above embodiment 1, and thus, having all the beneficial technical effects of the carrier assembly with the liquid injection structure, the same technical features and beneficial effects will not be repeated.

[0056] In this embodiment, the load-bearing component with a liquid injection structure is a cover plate 1 of the battery cell, and it should be noted that: along the first preset direction a, an opening is formed at one end of the shell, and the aforementioned cover plate assembly is installed only at this open end, that is, the aforementioned cover plate 1 is installed only at this open end of the shell, or along the first preset direction a, openings are formed at both ends of the shell, and the aforementioned load-bearing component with a liquid injection structure is installed only at one open end or both open ends of the shell, that is, the aforementioned cover plate 1 is installed only at one open end or both open ends of the shell, and the specific design is based on actual needs.

[0057] 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 it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to 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 component and an insulating component; wherein, along a first preset direction, the load-bearing component is formed with a liquid injection through hole running through both sides thereof; the insulating component 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.

2. The bearing assembly with a liquid injection structure according to claim 1, characterized in that: 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.

3. The bearing assembly with a liquid injection structure according to claim 1, characterized in that: The injection channel is formed at the junction of the bottom wall and the side wall of the buffer groove.

4. The bearing assembly with a liquid injection structure according to claim 3, characterized in that: 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.

5. The bearing assembly with a liquid injection structure according to claim 1, characterized in that: Along the first preset direction, an inlet liquid guiding slope is formed at the inlet end of the liquid injection channel close to the liquid injection through hole.

6. The bearing assembly with a liquid injection structure according to claim 5, characterized in that: The angle of the inlet liquid guiding slope is θ1, and 30°<θ1<80°.

7. The bearing assembly with a liquid injection structure according to claim 1, characterized in that: 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.

8. The bearing assembly with a liquid injection structure according to claim 7, characterized in that: The angle of the outlet liquid guiding slope is θ2, and 30°<θ2<80°.

9. The load-bearing assembly with a liquid injection structure according to any one of claims 1 to 8, 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.

10. 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 9, wherein the load-bearing component is a cover plate or a shell.

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