Battery cell end plate, battery cell and electric device

Abstract

The application relates to the technical field of power battery production, and provides a battery cell end plate, a battery cell and an electric device. The battery cell end plate is arranged in a battery cell shell and located between a battery cell cover plate and a pole group. The battery cell end plate has a containing cavity for containing a tab. In a first direction, opposite two side walls of the containing cavity are respectively provided with a support plate body and a reinforcing plate body. The support plate body has an inclined part which extends towards the containing cavity in the first direction and is inclined. The inclined part can guide the tab to be folded to one side of the pole group and support the bent part of the tab. The reinforcing plate body extends towards the opposite side wall in the first direction, and a channel for the tab to pass through is formed between the reinforcing plate body and the support plate body. The battery cell end plate can not only guide the tab to be folded to one side of the pole group, better support the bent part of the tab, and avoid the tab from being inserted into the pole group in a reverse direction due to the length of the tab, but also improve the overall structural strength of the battery cell end plate.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a cell end plate. It also relates to a battery cell equipped with the aforementioned cell end plate, and an electrical device incorporating the battery cell. Background Technology

[0002] Lithium-ion batteries are widely used in various fields such as transportation power supply, power storage, new energy storage power supply, aerospace and military industry due to their advantages such as large capacity, high operating voltage, strong charge retention capability and long cycle life.

[0003] The tabs, which are used to draw out the current from inside the battery cell, are usually made of copper foil / aluminum foil bonded together by ultrasonic welding. After ultrasonic welding, a layer of insulating protective tape is pasted on both sides of the tabs, and then they are inserted into the battery cell end plate. After that, they are welded to the poles on the cover plate, thereby drawing the current from inside the battery cell to the outside of the battery cell.

[0004] The existing cell end plates have structural weaknesses, such as weak sidewalls of the accommodating cavity for the tabs, which are prone to concave or convex deformation. This makes it difficult to pass the tabs through and results in poor quality of the thermal fusion wrapping of the insulating film and the cell end plate, affecting battery assembly and consequently the quality of battery manufacturing. Utility Model Content

[0005] In view of this, this application aims to propose a cell end plate to ensure the tab closing effect and improve the structural strength of the cell end plate, thereby improving the quality of battery manufacturing.

[0006] To achieve the above objectives, the technical solution of this application is implemented as follows: A cell end plate is disposed inside the cell housing and located between the cell cover plate and the electrode assembly. The cell end plate has a receiving cavity for accommodating the electrode tabs. In a first direction, a support plate and a reinforcing plate are respectively provided on two opposite side walls of the receiving cavity. The support plate has an inclined portion that extends inclinedly toward the cavity along the first direction. The inclined portion can guide the tab to retract toward one side of the electrode assembly and can support the bent portion of the tab. The reinforcing plate extends along the first direction toward the opposite sidewall, and a channel is formed between the reinforcing plate and the supporting plate for the electrode tab to pass through.

[0007] Furthermore, in the first direction, the dimensions A of the accommodating cavity and the dimensions a of the support plate satisfy the following: 1 / 3 ≤ a / A ≤ 3 / 4; Aa ≥ 3mm.

[0008] Furthermore, in the first direction, the dimensions A of the accommodating cavity and the dimensions b of the reinforcing plate satisfy the following: 1 / 3 ≤ b / A ≤ 2 / 3; Ab ≥ 5mm.

[0009] Furthermore, the cell end plate has a first end face and a second end face. The first end face is used to connect with the lower plastic of the cover plate, and the second end face is used to press the diaphragm in the electrode assembly. The distance h between the reinforcing plate and the first end face satisfies: 0.5mm≤h≤2mm.

[0010] Furthermore, the angle α between the inclined portion and the second end face satisfies: 60°≤α<90°.

[0011] Furthermore, the support plate has a straight portion connected to the inclined portion, and the inclined portion is connected to the side wall through the straight portion.

[0012] Furthermore, the dimension m of the straight portion in the first direction satisfies: 0 ≤ m ≤ 5 mm.

[0013] Furthermore, the distance between the straight portion and the second end face is set.

[0014] Compared with related technologies, this application has the following advantages: (1) The cell end plate described in this application, by setting a support plate and a reinforcing plate on two opposite side walls of the accommodating cavity, allows one side of the support plate to guide the tab to retract to one side of the electrode assembly, and the other side of the support plate to support the bent part of the tab, avoiding the tab being too long and causing the tab to be inserted into the electrode assembly in reverse. In addition, the reinforcing plate can improve the structural strength of the side wall where the reinforcing plate is located, preventing the side wall from deforming inward or outward due to insufficient strength, thereby also improving the overall structural strength of the cell end plate and helping to improve the quality of battery manufacturing.

[0015] (2) By limiting the size of the support plate in the first direction, it can not only ensure that the support plate provides good support for the bent tab, but also ensure that the tab has enough space to pass through.

[0016] (3) By limiting the size of the reinforcing plate in the first direction, the part of the tab near the pole post and the part of the tab near the pole group can be better isolated, thereby providing better insulation protection for the tab in the bent state.

[0017] (4) By limiting the distance between the reinforcing plate and the first end face of the cell end plate, it is beneficial to provide sufficient space for the bent part of the tab and to ensure the consistency of the tab bending.

[0018] (5) The inclined part on the support plate can provide good support for the tab part that is gathered from the side of the electrode group to the top of the inclined part, and can play a good limiting role to ensure the stability of the tab structure. At the same time, it can provide enough bending space for the tab to prevent the tab from being inserted into the electrode group after redundancy, which would affect the battery performance.

[0019] (6) The flat part on the support plate can facilitate the injection molding of the support plate body on the cell end plate, thereby facilitating the preparation and molding of the cell end plate.

[0020] (7) Limiting the dimensions of the straight portion in the first direction can further facilitate the injection molding of the support plate on the cell end plate, and further facilitate the preparation and molding of the cell end plate.

[0021] (8) The distance between the straight part and the second end face of the cell end plate is set so as to avoid the straight part from putting pressure on the electrode group and improve the cell manufacturing quality.

[0022] This application also proposes a battery cell having a battery cell end plate as described above.

[0023] The battery cell described in this application, by adopting the aforementioned battery cell end plate, can not only guide the tabs to converge towards the front side of the electrode assembly, providing better support for the bent tabs, but also enhance the structural strength of the side wall by using the reinforcing plate, thereby improving the overall structural strength of the battery cell end plate and also helping to improve the manufacturing quality of the battery cell.

[0024] In addition, this application also proposes an electrical device in which the above-mentioned battery cell is provided.

[0025] The electrical equipment described in this application, by adopting the aforementioned battery cell, can improve the overall structural strength of the battery cell end plate while also improving the manufacturing quality of the battery cell, thereby enhancing the reliability of the electrical equipment. Attached Figure Description

[0026] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a perspective view of the cell end plate described in the embodiments of this application; Figure 2 This is a front view of the cell end plate described in an embodiment of this application; Figure 3 for Figure 2 Sectional view from the AA direction; Figure 4 This is an exploded view of the cell end plate described in the embodiments of this application applied to the cell; Figure 5This is a cross-sectional view of the application state of the cell end plate described in the embodiments of this application; Explanation of reference numerals in the attached figures: 1. Cell end plate; 2. Cell housing; 3. Electrode assembly; 4. Cell cover plate; 11. First end face; 12. Second end face; 100. Receiving cavity; 101. First side wall; 102. Second side wall; 103. Third side wall; 104. Fourth side wall; 105. Support plate; 106. Reinforcing plate; 107. Channel; 301. Electrode; 302. Insulating film; 3011. First part; 3012. Second part; 3013. Third part; 401. Electrode post. Detailed Implementation

[0027] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0029] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0031] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0032] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0033] An embodiment of the first aspect of this application provides a cell end plate, which is disposed inside the cell housing and located between the cell cover and the electrode assembly. By optimizing the structure of the cell end plate, the overall structural strength of the cell end plate can be enhanced while ensuring the tab closing effect.

[0034] In related technologies, the tabs, which serve as leads to draw the current from inside the battery cell, are usually made of copper foil / aluminum foil bonded together by ultrasonic welding. After ultrasonic welding, a layer of insulating protective tape is pasted on both sides of the tabs, which are then inserted into the battery cell end plate and then welded to the poles on the cover plate, thereby drawing the current from inside the battery cell to the outside of the battery cell.

[0035] The existing cell end plates have structural weaknesses, such as weak sidewalls of the accommodating cavity for the tabs, which are prone to concave or convex deformation. This makes it difficult to pass the tabs through and results in poor quality of the thermal fusion wrapping of the insulating film and the cell end plate, affecting battery assembly and consequently the quality of battery manufacturing.

[0036] In view of this, in order to overcome the shortcomings of related technologies, the cell end plate of this embodiment combines... Figures 1 to 5 As shown, in terms of overall design, the cell end plate 1 has a receiving cavity 100 for accommodating the tab 301. In the first direction, a support plate 105 and a reinforcing plate 106 are respectively provided on the two opposite side walls of the receiving cavity 100.

[0037] The support plate 105 has an inclined portion extending in a first direction toward the accommodating cavity 100. The inclined portion can guide the tab 301 to converge toward one side of the electrode assembly 3 and can support the bent portion of the tab 301. The reinforcing plate 106 extends in a first direction toward the opposite sidewall, and a channel 107 is formed between the reinforcing plate 106 and the support plate 105 for the tab 301 to pass through.

[0038] Therefore, by setting the support plate 105 and the reinforcing plate 106 on the two opposite sidewalls of the accommodating cavity 100, one side of the support plate 105 can guide the tab 301 to retract to one side of the electrode group 3, and the other side of the support plate 105 can support the bent part of the tab 301, avoiding the tab 301 being too long and causing the tab 301 to be inserted into the electrode group 3 backwards. In addition, by using the reinforcing plate 106, the structural strength of the sidewall where the reinforcing plate is located can be improved, preventing the sidewall from deforming inward or outward due to insufficient strength, thereby also improving the overall structural strength of the cell end plate 1, which is conducive to improving the quality of battery manufacturing.

[0039] Based on the above overall introduction, specifically, combined with Figure 1 and Figure 2 As shown, the cell end plate 1 is rectangular in shape in its overall structure, and the cell end plate 1 includes a first side wall 101 and a third side wall 103 arranged opposite to each other along a first direction, and a second side wall 102 and a fourth side wall 104 connected between the first side wall 101 and the third side wall 103. The first side wall 101, the second side wall 102, the third side wall 103 and the fourth side wall 104 form a receiving cavity 100 for accommodating the tab 301.

[0040] The first direction refers to the width direction of the cell end plate 1, and the second direction refers to the length direction of the cell end plate 1. In the first direction, a support plate 105 and a reinforcing plate 106 are respectively provided on the two opposite sidewalls of the accommodating cavity 100. Specifically, the support plate 105 and the reinforcing plate 106 are respectively provided on the first sidewall 101 and the third sidewall 103. For example, if the support plate 105 is provided on the first sidewall 101, then the reinforcing plate 106 is provided on the third sidewall 103. If the reinforcing plate 106 is provided on the first sidewall 101, then the support plate 105 is provided on the third sidewall 103. The following detailed explanation uses the example of the support plate 105 on the first sidewall 101 and the reinforcing plate 106 on the third sidewall 103 as an example.

[0041] Combination Figures 1 to 3 ,as well as Figure 5 As shown, the reinforcing plate 106 extends along a first direction toward the first sidewall 101, and a channel 107 is formed between the reinforcing plate 106 and the supporting plate 105 for the electrode tab 301 to pass through. The free end of the electrode tab 301 passes through the channel 107 from one side of the electrode assembly 3, bends in an S-shape, and is then welded to the electrode post 401 on the cover plate.

[0042] Reference Figure 3As shown, in some exemplary embodiments, for example, in the first direction, the dimension A of the receiving cavity 100 and the dimension a of the support plate satisfy the following relationship: 1 / 3 ≤ a / A ≤ 3 / 4; Aa ≥ 3 mm. This restriction of the relationship 1 / 3 ≤ a / A ≤ 3 / 4 ensures that the support plate provides good support for the bent tab 301. Simultaneously, ensuring that the difference between the dimension A of the receiving cavity 100 and the dimension a of the support plate is greater than or equal to 3 mm guarantees that the tab 301 has sufficient space to pass through the channel 107.

[0043] Furthermore, in specific implementations, the ratio a / A of the dimension A of the receiving cavity 100 to the dimension a of the support plate can be set to, for example, 1 / 3, 2 / 5, 1 / 2, 3 / 5, 2 / 3, or 3 / 4, etc. The difference between the dimension A of the receiving cavity 100 and the dimension a of the support plate can be set to, for example, 3mm, 4mm, 5mm, or other values, and the ratio between these other values ​​and the dimension A of the receiving cavity 100 needs to be between 1 / 3 and 1 / 4. Thus, by limiting the dimension of the support plate in the first direction, not only can the support plate provide good support for the bent tab 301, but the tab 301 can also have sufficient space to pass through the channel 107.

[0044] Continue to combine Figure 3 and Figure 5 As shown, the cell end plate 1 has a first end face 11 and a second end face 12, wherein the first end face 11 is used to connect with the lower plastic of the cover plate, and the second end face 12 is used to press the diaphragm in the electrode assembly 3. The support plate 105 has an inclined portion extending inclinedly into the receiving cavity 100 along a first direction. This inclined portion can guide the tab 301 to retract to one side of the electrode assembly 3 and can support the bent portion of the tab 301.

[0045] In some exemplary embodiments, the included angle α between the inclined portion and the second end face 12 satisfies: 60° ≤ α < 90°. In specific implementations, the included angle α can be set to, for example, 60°, 65°, 70°, 75°, 80°, 85°, or 89°, etc.

[0046] At this time, by limiting the tilt angle of the tilted part on the support plate, the tab 301 part that is gathered from the side of the electrode group 3 to the top of the tilted part can be well supported and can play a good limiting role, maintaining the structural stability of the tab 301. At the same time, it can provide sufficient bending space for the tab 301 to prevent the tab 301 from being inserted backward into the electrode group 3 after redundancy, which would affect the battery performance.

[0047] Specifically, refer to Figure 5As shown, the electrode tab 301 on the electrode assembly 3 has a first part 3011 that is gathered on one side of the electrode assembly 3, a second part 3012 located between the support plate 105 and the reinforcing plate 106, and a third part 3013 located between the reinforcing plate 106 and the cover plate. The first part 3011, the second part 3012 and the third part 3013 are connected end to end to form a whole, and the free end of the electrode tab 301 is located at the end of the third part 3013. In specific implementation, the free end of the electrode tab 301 passes through the channel 107, and under the action of the inclined part of the support plate 105, the first part 3011 of the electrode tab 301 is gathered on one side of the electrode group 3, the second part 3012 is bent relative to the first part 3011 and is located between the support plate 105 and the reinforcing plate 106, and the third part 3013 is bent relative to the second part 3012 and is located between the reinforcing plate 106 and the cover plate, and the third part 3013 is welded to the bottom of the electrode post 401 on the cover plate.

[0048] At this time, the inclined part on the support plate 105 can provide good support for the second part 3012 of the tab 301 and play a good limiting role, ensuring the structural stability of the tab 301. It can also provide sufficient bending space for the tab 301 to prevent the tab 301 from being inserted into the electrode group 3 after redundancy, which would affect the battery performance.

[0049] It should be noted that the cell end plate 1 can be detachably connected to the lower plastic of the cover plate through a snap-fit ​​structure or a screw-fit structure, or it can be fixed to the lower plastic of the cover plate by adhesive or other means. Of course, in the battery assembly state, the cell end plate 1 can also be limited and fixed between the lower plastic of the cover plate and the separator of the electrode group 3 by the assembly force between the cover plate and the electrode group 3.

[0050] Based on the inclined portion of the support plate 105, combined with Figure 3 and Figure 5 As shown, in some exemplary embodiments, the support plate 105 may also have a straight portion connected to the inclined portion, and the inclined portion is connected to the sidewall through the straight portion. In this case, the straight portion on the support plate facilitates the injection molding of the support plate 105 on the cell end plate 1, thereby facilitating the fabrication and molding of the cell end plate 1.

[0051] Still refer to Figure 3 and Figure 5As shown, in some exemplary embodiments, the dimension m of the straight portion in the first direction satisfies: 0 ≤ m ≤ 5 mm. By limiting the dimension of the straight portion in the first direction, it is possible to further facilitate the injection molding of the support plate 105 on the cell end plate 1, and further facilitate the fabrication and molding of the cell end plate 1. In specific embodiments, the dimension m can be set to, for example, 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm. When it is set to 0 mm, that is, no straight portion is provided.

[0052] In some exemplary embodiments, the straight portion is spaced further apart from the second end face 12. Specifically, the straight portion is closer to the first end face 11 than the second end face 12. This arrangement avoids the straight portion exerting pressure on the electrode assembly 3, thus improving the cell manufacturing quality.

[0053] Reference Figure 3 As shown, in some exemplary embodiments, for example, in the first direction, the dimension A of the accommodating cavity 100 and the dimension b of the reinforcing plate 106 satisfy the following: 1 / 3 ≤ b / A ≤ 2 / 3; Ab ≥ 5 mm. In this case, by limiting the dimension of the reinforcing plate in the first direction, the portion of the tab 301 near the pole post 401 can be better isolated from the portion of the tab 301 near the pole group 3, thereby providing better insulation protection for the bent tab 301.

[0054] In specific implementation, the ratio b / A of the dimension A of the accommodating cavity 100 and the dimension b of the reinforcing plate 106 can be set to, for example, 1 / 3, 2 / 5, 1 / 2, 3 / 5 or 2 / 3, etc. The difference between the dimension A of the accommodating cavity 100 and the dimension b of the reinforcing plate 106 can be set to, for example, 5mm, 6mm, 7mm or other values, and the ratio between the other value and the dimension A of the accommodating cavity 100 needs to be between 1 / 3 and 2 / 3.

[0055] Continue to refer to Figure 3 As shown, in some exemplary embodiments, for example, the distance h between the reinforcing plate 106 and the first end face 11 satisfies: 0.5mm ≤ h ≤ 2mm. Limiting the distance between the reinforcing plate 106 and the first end face 11 of the cell end plate 1 helps to provide sufficient space for the bent portion of the tab 301 and ensures the consistency of the tab 301's bending. Furthermore, in specific implementations, the distance h between the reinforcing plate 106 and the first end face 11 can be set to, for example, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, or 2mm, etc.

[0056] It is worth noting that, regarding the cell end plate 1 of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still composed of... Figures 1 to 5As shown, it has a receiving cavity 100 for accommodating the tab 301, and in a first direction, a support plate 105 and a reinforcing plate 106 are respectively provided on two opposite side walls of the receiving cavity 100. The support plate 105 has an inclined portion extending inclinedly into the receiving cavity 100 along the first direction. The inclined portion can guide the tab 301 to converge toward one side of the electrode assembly 3 and can support the bent portion of the tab 301. The reinforcing plate 106 extends in the first direction toward the opposite side wall, and a channel 107 is formed between the reinforcing plate 106 and the support plate 105 for the tab 301 to pass through.

[0057] In the first direction, the dimensions A of the accommodating cavity 100 and a of the supporting plate satisfy the following: 1 / 3 ≤ a / A ≤ 3 / 4; Aa ≥ 3 mm. The dimensions A of the accommodating cavity 100 and b of the reinforcing plate 106 satisfy the following: 1 / 3 ≤ b / A ≤ 2 / 3; Ab ≥ 5 mm.

[0058] The cell end plate 1 has a first end face 11 and a second end face 12. The first end face 11 is used to connect with the lower plastic of the cover plate, and the second end face 12 is used to press the diaphragm in the electrode assembly 3. The distance h between the reinforcing plate 106 and the first end face 11 satisfies: 0.5mm ≤ h ≤ 2mm. Furthermore, the included angle α between the inclined portion and the second end face 12 satisfies: 60° ≤ α < 90°.

[0059] The support plate 105 has a straight portion connected to the inclined portion, and the inclined portion is connected to the side wall through the straight portion. The dimension m of the straight portion in the first direction satisfies: 0 ≤ m ≤ 5 mm. Furthermore, the distance between the straight portion and the second end face 12 is set.

[0060] In the above preferred embodiments, the specific structural settings of the reinforcing plate 106 and the supporting plate 105, as well as the limitation of the dimensions of the reinforcing plate 106 and the supporting plate 105, can still be found in the descriptions of the above exemplary embodiments. Furthermore, the beneficial effects brought about by the design of the specific structural settings of the reinforcing plate 106 and the supporting plate 105, as well as the limitation of the dimensions of the reinforcing plate 106 and the supporting plate 105, in this preferred embodiment can also be found in the descriptions of the above exemplary embodiments.

[0061] The cell end plate 1 of this embodiment adopts the above design. With the support plate 105 and the reinforcing plate 106, the support plate 105 can not only guide the tab 301 to retract to one side of the electrode group 3, but also support the bent part of the tab 301, so as to avoid the tab 301 being too long and causing the tab 301 to be inserted into the electrode group 3 backwards. At the same time, the reinforcing plate 106 can also enhance the structural strength of the side wall where the reinforcing plate is located, and prevent the side wall from deforming inward or outward due to insufficient strength. This can improve the overall structural strength of the cell end plate 1 and help improve the quality of battery manufacturing.

[0062] An embodiment of the second aspect of this application provides a battery cell having a battery cell end plate 1 as described above.

[0063] Reference Figure 4 As shown, the battery cell structurally includes a battery cell housing 2 with openings at both ends, battery cell cover plates 4 located at the openings at both ends, and a battery cell end plate 1. The battery cell housing 2 contains an electrode assembly 3, the outer periphery of which is covered with an insulating film 302. This insulating film 302 serves to insulate the electrode assembly 3 from the battery cell housing 2. The two battery cell cover plates 4 are a positive electrode cover plate and a negative electrode cover plate, respectively. The battery cell end plate 1 is located between the positive electrode cover plate and the electrode assembly 3, and part of the outer periphery of the battery cell end plate 1 is also covered with the insulating film 302 to better insulate the electrode assembly 3 from the battery cell housing 2.

[0064] During assembly, the free end of the tab 301 in the electrode assembly 3 passes through the channel 107 and is welded to the electrode post 401 on the cell cover plate 4. The first end of the cell end plate 1 is connected to the lower plastic of the cell housing 2, and the second end of the cell end plate 1 presses against the diaphragm in the electrode assembly 3.

[0065] In this embodiment, the battery cell, by adopting the battery cell end plate 1 described above, can not only guide the tab 301 to converge toward the front side of the electrode group 3, providing better support for the bent tab 301, but also enhance the structural strength of the side wall where it is located by using the reinforcing plate 106, thereby improving the overall structural strength of the battery cell end plate 1, and also helping to improve the manufacturing quality of the battery cell.

[0066] An embodiment of the third aspect of this application provides an electrical device that includes the aforementioned battery cell.

[0067] The electrical equipment of this embodiment, by adopting the above-mentioned battery cell, can improve the overall structural strength of the battery cell end plate 1 and improve the manufacturing quality of the battery cell, thereby improving the reliability of the electrical equipment.

[0068] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A cell end plate, disposed within a cell housing and located between a cell cover plate and an electrode assembly, characterized in that: The cell end plate has a cavity for accommodating the tabs, and in a first direction, a support plate and a reinforcing plate are respectively provided on two opposite side walls of the cavity; The support plate has an inclined portion that extends inclinedly toward the cavity along the first direction. The inclined portion can guide the tab to retract toward one side of the electrode assembly and can support the bent portion of the tab. The reinforcing plate extends along the first direction toward the opposite sidewall, and a channel is formed between the reinforcing plate and the supporting plate for the electrode tab to pass through.

2. The cell end plate according to claim 1, characterized in that: In the first direction, the dimensions A of the accommodating cavity and the dimensions a of the support plate satisfy the following: 1 / 3 ≤ a / A ≤ 3 / 4; Aa ≥ 3mm.

3. The cell end plate according to claim 1, characterized in that: In the first direction, the dimensions A of the accommodating cavity and the dimensions b of the reinforcing plate satisfy the following: 1 / 3 ≤ b / A ≤ 2 / 3; Ab ≥ 5mm.

4. The cell end plate according to any one of claims 1 to 3, characterized in that: The cell end plate has a first end face and a second end face. The first end face is used to connect with the lower plastic of the cover plate, and the second end face is used to press the diaphragm in the electrode assembly. The distance h between the reinforcing plate and the first end face satisfies: 0.5mm ≤ h ≤ 2mm.

5. The cell end plate according to claim 4, characterized in that: The angle α between the inclined portion and the second end face satisfies: 60°≤α<90°.

6. The cell end plate according to claim 4, characterized in that: The support plate has a straight portion connected to the inclined portion, and the inclined portion is connected to the side wall through the straight portion.

7. The cell end plate according to claim 6, characterized in that: The dimension m of the straight portion in the first direction satisfies: 0 ≤ m ≤ 5 mm.

8. The cell end plate according to claim 6, characterized in that: The distance between the straight portion and the second end face is set.

9. A battery cell, characterized in that: The battery cell is provided with a battery cell end plate as described in any one of claims 1 to 8.

10. An electrical appliance, characterized in that: The electrical equipment is equipped with the battery cell as described in claim 9.

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