Battery and electric device

Abstract

The utility model discloses a kind of battery and electrical equipment, battery includes: shell, with storage cavity;Battery core, is set in storage cavity;Current collector disc, between the bottom wall of storage cavity and battery core, current collector disc includes first body part, second body part, bending part and convex part, convex part is connected in first body part, and convex part is protruding relative to first body part, the end of convex part away from first body part is abutted in the bottom wall of storage cavity, the both ends of bending part are connected in first body part and second body part respectively;Wherein, bending part can be bent, to make first body part switch between first state and second state, when first body part is in first state, first body part is protruding relative to second body part, when first body part is in second state, first body part and second body part flush.The battery of the utility model can effectively avoid shell deformation.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery and electrical equipment. Background Technology

[0002] In related technologies, silicon anodes are used as anode materials in lithium-ion batteries, and they can improve the energy density of the battery. The higher the silicon content, the higher the energy density. However, while silicon anodes can provide high energy density, they also exhibit significant expansion. For example, the expansion rate of graphite anodes is typically 10%, while that of silicon anodes is 300%. This expansion can cause the bottom of the battery casing to bulge and deform during use. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a battery that can effectively prevent casing deformation.

[0004] This utility model also proposes an electrical device.

[0005] The battery according to a first aspect embodiment of the present invention includes:

[0006] The casing has a storage cavity;

[0007] The battery cell is disposed in the storage cavity;

[0008] A current collector is located between the bottom wall of the storage cavity and the battery cell. The current collector includes a first body part, a second body part, a bent part, and a protruding part. The protruding part is connected to the first body part and protrudes relative to the first body part. The end of the protruding part away from the first body part abuts against the bottom wall of the storage cavity. The two ends of the bent part are respectively connected to the first body part and the second body part.

[0009] The bending portion can be bent to allow the first body portion to switch between a first state and a second state. When the first body portion is in the first state, the first body portion protrudes relative to the second body portion. When the first body portion is in the second state, the first body portion and the second body portion are flush.

[0010] The battery according to the embodiments of this utility model has at least the following beneficial effects: Silicon-containing cells are prone to expansion. In this application, the current collector is located between the cell and the bottom wall of the storage cavity, with the protrusion abutting against the bottom wall of the storage cavity. At this time, there is a large distance between the second body and the bottom wall of the storage cavity. When the cell does not expand, the first body is in the second state, with the first and second body flush. When the cell expands, it compresses the second body, causing the bending portion to bend. The first body switches from the second state to the first state. At this time, the first body protrudes relative to the second body in the direction facing the cell, and the distance between the second body and the bottom wall of the storage cavity decreases. That is, the design of the first body, second body, bending portion, and protrusion in the current collector, through the bending of the bending portion, reduces the distance between the second body and the bottom wall of the storage cavity, providing a certain buffer space for the cell and effectively avoiding the problem of casing deformation due to cell buffering. Specifically, the battery can effectively prevent casing deformation.

[0011] According to some embodiments of the present invention, the battery has multiple bending portions, which are circumferentially spaced around the first body portion.

[0012] According to some embodiments of the present invention, the battery comprising the first body portion, the second body portion, the protrusion portion, and the bending portion is an integral structure.

[0013] According to some embodiments of the present invention, in a battery, the second body portion surrounds the circumferential edge connected to the bent portion, the bent portion surrounds the circumferential edge connected to the first body portion, and the yield strength of both the first body portion and the second body portion is greater than the yield strength of the bent portion.

[0014] According to some embodiments of the present invention, the battery cell has a receiving hole, and when the first body portion is in the first state, the first body portion is located in the receiving hole.

[0015] In some embodiments of the battery according to this utility model, the receiving hole is located at the center of the battery cell.

[0016] According to some embodiments of the present invention, the battery further includes a buffer member, the two sides of which are respectively connected to the bottom wall of the storage cavity and the second body portion.

[0017] According to some embodiments of the present invention, the size of the buffer is L1 along the height direction of the battery, and the size of the protrusion is L2, where L1 < L2.

[0018] According to some embodiments of the present invention, the battery has multiple buffer members, which are circumferentially spaced around the first body portion.

[0019] According to some embodiments of the present invention, the battery cell includes a negative electrode sheet, which is made of silicon material.

[0020] The electrical device according to the second aspect of the present invention includes the battery described in any one of the first aspect embodiments.

[0021] The electrical device according to the embodiments of this utility model has at least the following beneficial effects: Silicon-containing battery cells are prone to expansion. In this application, the current collector is located between the battery cell and the bottom wall of the storage cavity, with the protrusion abutting against the bottom wall of the storage cavity. At this time, there is a large distance between the second body and the bottom wall of the storage cavity. When the battery cell does not expand, the first body is in the second state, with the first and second body flush. When the battery cell expands, it compresses the second body, causing the bending portion to bend. The first body switches from the second state to the first state. At this time, the first body protrudes relative to the second body in the direction facing the battery cell, and the distance between the second body and the bottom wall of the storage cavity decreases. That is, the design of the first body, second body, bending portion, and protrusion in the current collector, through the bending of the bending portion, reduces the distance between the second body and the bottom wall of the storage cavity, providing a certain buffer space for the battery cell and effectively avoiding the problem of casing deformation due to battery cell buffering. Specifically, the battery can effectively avoid casing deformation. Furthermore, electrical devices equipped with this battery have higher safety levels.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 This is a schematic diagram of a battery according to some embodiments of the present invention;

[0025] Figure 2 This is a schematic diagram showing the first body portion of the battery in a second state in some embodiments of the present invention;

[0026] Figure 3 This is a schematic diagram of the first body portion of the battery in a first state according to some embodiments of the present invention;

[0027] Figure 4 This is a schematic diagram of the current collector in the battery according to the first embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the current collector in the battery according to the second embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the current collector and buffer in the battery according to the first embodiment of this utility model;

[0030] Figure 7 This is a schematic diagram of the current collector and buffer in the battery according to the second embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of a battery cell in some embodiments of the present invention.

[0032] Figure label:

[0033] Battery 10, casing 100, storage cavity 110, battery cell 200, receiving hole 210, current collector 300, first body part 310, second body part 320, bending part 330, protrusion part 340, buffer member 500. Detailed Implementation

[0034] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0035] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0036] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0037] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0038] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] Please refer to Figures 1 to 8 In some embodiments, the battery 10 includes a casing 100, a cell 200, and a current collector 300. The casing 100 has a storage cavity 110, and the casing 100 can be made of a metal, such as copper, iron, or stainless steel. The shape of the casing 100 can be cylindrical, cubic, or cuboid. The cell 200 is disposed in the storage cavity 110, and the cell 200 includes a negative electrode and a positive electrode. The positive and negative electrode are stacked and wound to form the cell 200, which has a wound structure. The negative electrode includes silicon material, which is prior art and will not be described further here. The current collector 300 can be made of copper or nickel, and the thickness of the current collector 300 is 0.1 mm to 0.5 mm. The current collector 300 is located between the bottom wall of the storage cavity 110 and the cell 200, that is, the current collector 300 is located at the bottom of the cell 200. The current collector 300 includes a first body portion 310, a second body portion 320, a bent portion 330, and a protrusion 340. The current collector 300 can be electrically connected to the negative electrode tab of the battery cell 200. The protrusion 340 is connected to the first body portion 310 and protrudes relative to the first body portion 310. The maximum protrusion of the protrusion 340 relative to the first body portion 310 is 0.02A, where A is the width of the negative electrode plate. The end of the protrusion 340 away from the first body portion 310 abuts against the bottom wall of the storage cavity 110, and the two ends of the bent portion 330 are respectively connected to the first body portion 310 and the second body portion 320. The bent portion 330 can be bent to switch the first body portion 310 between a first state and a second state. When the first body portion 310 is in the first state, the first body portion 310 protrudes relative to the second body portion 320, as detailed in [reference needed]. Figure 3 At this time, the bending portion 330 is bent, so the first body portion 310 protrudes relative to the second body portion 320. When the first body portion 310 is in the second state, the first body portion 310 and the second body portion 320 are flush, as can be seen in the following figure. Figure 2At this time, the bent portion 330 is not bent, and the first body portion 310 and the second body portion 320 are flush, with their surfaces on the same horizontal line. That is, the first body portion 310 in the first state and the second state depend on whether the bent portion 330 is bent. Specifically, the silicon-containing cell 200 is prone to expansion. In this application, the current collector 300 is located between the cell 200 and the bottom wall of the storage cavity 110, and the protrusion 340 abuts against the bottom wall of the storage cavity 110. At this time, there is a large distance between the second body portion 320 and the bottom wall of the storage cavity 110. When the cell 200 is not expanded, the first body portion 310 is in the second state, and the first body portion 310 and the second body portion 320 are flush. When the cell 200 expands, the cell 200 squeezes the second body portion 320, and the bent portion 330 is bent. The first body portion 310 then... The second state switches to the first state. At this time, the first body portion 310 protrudes relative to the second body portion towards the cell 200, and the distance between the second body portion 320 and the bottom wall of the storage cavity 110 decreases. That is, the design of the first body portion 310, the second body portion 320, the bent portion 330, and the protruding portion 340 in the current collector 300, through the bending of the bent portion 330, reduces the distance between the second body portion 320 and the bottom wall of the storage cavity 110, providing a certain buffer space for the cell 200 and effectively preventing the casing 100 from deforming due to the buffering effect of the cell 200. Specifically, the battery 10 can effectively prevent the casing 100 from deforming.

[0040] Furthermore, the specific structure of the collector disk 300 is described below. Please refer to [link / reference]. Figure 3 and Figure 4 In some embodiments, multiple bending portions 330 are provided, and the multiple bending portions 330 are arranged circumferentially around the first body portion 310. The length of the bending portion 330 can be 2 mm. That is, one end of the bending portion 330 is connected to the first body portion 310, and the other end of the bending portion 330 is connected to the second body portion 320. A through hole is formed between two adjacent bending portions 330, which makes it easier for the bending portion 330 to be bent. In addition, this design not only makes it easier for the bending portion 330 to be bent when the cell 200 expands, thereby reducing the risk of deformation of the casing 100, but also reduces the weight of the current collector 300, achieving a lightweight design for the battery 10.

[0041] Furthermore, in some embodiments, the first body portion 310, the second body portion 320, the protrusion 340, and the bending portion 330 are integrally formed. Specifically, the collector plate 300 can be made of metals such as copper or nickel, and its shape can be circular. After manufacturing the first body portion 310, the second body portion 320, and the bending portion 330, the protrusion 340 can be welded on. Alternatively, the collector plate 300 can be manufactured directly by stamping, and then through holes can be formed between adjacent bending portions 330 by laser etching, which can improve work efficiency.

[0042] Furthermore, the method of forming through holes between multiple bending portions 330 facilitates the bending of the bending portion 330. In addition to the above method, other methods are also available. For details, please refer to... Figure 5 In some embodiments, the second body portion 320 surrounds the circumferential edge connected to the bent portion 330, and the second body portion 320 and the bent portion 330 may be annular. The bent portion 330 surrounds the circumferential edge connected to the first body portion 310, and the first body portion 310 may be circular. The yield strength of both the first body portion 310 and the second body portion 320 is greater than the yield strength of the bent portion 330. This means that the materials of the first body portion 310 and the second body portion 320 may be nickel, zinc, or copper, etc., and the material of the bent portion 330 may be silver, copper, tin, gold, or lead. For example, the materials of the first body portion 310 and the second body portion 320 may be copper, and the material of the bent portion 330 may be tin, gold, or lead. Thus, when the current collector 300 is subjected to the expansion force of the battery cell 200, the lower yield strength at the bending portion 330 makes it easier to bend and deform, thereby enabling the first body portion 310 to protrude relative to the second body portion 320 in the direction of the battery cell 200.

[0043] Further, please refer to Figure 8 In some embodiments, the battery cell 200 has a receiving hole 210. When the first body portion 310 is in a first state, the first body portion 310 is located in the receiving hole 210. Specifically, after the bent portion 330 is bent, the first body portion 310 is in the first state, and the first body portion 310 protrudes towards the battery cell 200 relative to the second body portion 320. At this time, the first body portion 310 can be located in the storage cavity 110 or in the receiving hole 210. When the first body portion 310 is located in the storage cavity 110, there is a certain distance between the battery cell 200 and the storage cavity 110. When the first body portion 310 is located in the receiving hole 210, a receiving hole 210 can be provided on the battery cell 200.

[0044] Furthermore, in some embodiments, the receiving hole 210 is located at the center of the cell 200. Specifically, the receiving hole 210 being located at the center of the cell 200 can mean that the cell 200 includes a negative electrode and a positive electrode, which are stacked and wound together to form the cell 200, resulting in a wound structure. The wound structure has a receiving hole 210 at its center. This arrangement eliminates the need for additional processing steps; the receiving hole 210 is formed incidentally during the formation of the cell 200. This avoids sacrificing the space of the storage cavity 110 and reduces the amount of cell 200 used, thereby increasing the energy density of the battery 10.

[0045] Further, please refer to Figure 6 In some embodiments, the battery 10 further includes a buffer 500, with its two sides connected to the bottom wall of the storage cavity 110 and the second body 320, respectively. The buffer 500 can further mitigate the expansion of the battery cell 200; that is, the buffer 500 can absorb the expansion force of the battery cell 200, thereby further preventing deformation of the casing 100. Furthermore, the buffer 500 can also prevent hard contact between the casing 100 and the battery cell 200. The buffer 500 can be made of materials such as styrene-butadiene rubber, ethylene-vinyl acetate copolymer, or thermoplastic polyurethane elastomer.

[0046] Furthermore, in some embodiments, along the height direction of the battery 10, the size of the buffer 500 is L1, and the size of the protrusion 340 is L2, where L1 < L2. The thickness of the buffer 500 is 0.1mm to 0.5mm. The width of the buffer 500 is 2mm to 3mm. The size of the protrusion 340 specifically refers to its height. Specifically, if the size of the buffer 500 is larger than the size of the protrusion 340, the bending portion 330 will be unable to bend, and the expansion force of the cell 200 will be concentrated on the buffer 500, which may cause the casing 100 to deform.

[0047] Further, please refer to Figure 7 In some embodiments, multiple buffer members 500 are provided, and the multiple buffer members 500 are arranged circumferentially around the first body portion 310. Specifically, when a single buffer member 500 is provided, the buffer member 500 may be ring-shaped and connected to the edge of the second body portion 320. When multiple buffer members 500 are provided, the multiple buffer members 500 are arranged circumferentially around the first body portion 310. The shape of the buffer member 500 is not specifically limited; the buffer member 500 may be triangular, square, rectangular, or circular. Multiple buffer members 500 can improve the buffering effect.

[0048] The following experiment illustrates that in Example 1, the diameter of the battery cell 200 is approximately 17.8 mm, the width of the negative electrode is 58 mm, the silicon mass fraction of the negative electrode is 10%, the width of the positive electrode is 56 mm, the height of the battery cell 200 is 61 mm, the diameter of the current collector 300 is 17 mm, the thickness is 0.2 mm, and the material is copper. The height of the protrusion 340 is 1 mm, and the thickness of the buffer 500 is 0.8 mm, and the material is TPU.

[0049] In Example 2, the parameters are the same as in Example 1, except that the silicon content in the negative electrode is reduced to 5%.

[0050] In Example 3, the only difference is that the material of the buffer 500 is changed from TPU to SBR, while the other parameters are the same as in Example 1.

[0051] In Comparative Example 1, the existing collector disk 300 is used, and the other parameters are the same as in Example 1;

[0052] In Comparative Example 2, the battery 10 does not include the buffer 500, and the other parameters are the same as in Example 1;

[0053] In Comparative Example 3, the negative electrode does not contain silicon, the current collector 300 adopts the structure of the prior art, and the remaining parameters are the same as in Example 1. Please refer to the table below for details.

[0054]

[0055] Performance test results: The batteries 10 in Examples 1-3 and Comparative Examples 1-3 were subjected to long-term fast-charge cycle tests (1.2C / 5C) for 100 and 300 cycles respectively. The height of the casing 100 was measured to evaluate the deformation of the battery 10. As shown in the table above, in silicon-containing batteries 10, the expansion characteristics of silicon cause severe deformation during use, posing a safety risk. The battery 10 of this application significantly improves the deformation situation and enhances safety performance. Furthermore, the combined effect of the buffer 500 and the current collector 300 effectively improves the deformation of the battery 10.

[0056] In some embodiments, the electrical device includes the battery 10 of any of the above embodiments. Specifically, the silicon-containing cell 200 is prone to expansion. In this application, the current collector 300 is located between the cell 200 and the bottom wall of the storage cavity 110, and the protrusion 340 abuts against the bottom wall of the storage cavity 110. At this time, there is a large distance between the second body portion 320 and the bottom wall of the storage cavity 110. When the cell 200 is not expanded, the first body portion 310 is in the second state, and the first body portion 310 and the second body portion 320 are flush. When the cell 200 expands, the cell 200 squeezes the second body portion 320, and the bending portion 330 is bent. The first body portion 310... Switching from the second state to the first state, the first body portion 310 protrudes relative to the second body portion towards the cell 200, and the distance between the second body portion 320 and the bottom wall of the storage cavity 110 decreases. That is, the design of the first body portion 310, the second body portion 320, the bent portion 330, and the protruding portion 340 in the collector plate 300, through the bending of the bent portion 330, reduces the distance between the second body portion 320 and the bottom wall of the storage cavity 110, providing a certain buffer space for the cell 200 and effectively preventing the casing 100 from deforming due to the buffering effect of the cell 200. Specifically, the battery 10 can effectively prevent the casing 100 from deforming. Furthermore, electrical devices equipped with this battery 10 have higher safety.

[0057] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A battery, characterized in that, include: The casing has a storage cavity; The battery cell is disposed in the storage cavity; A current collector is located between the bottom wall of the storage cavity and the battery cell. The current collector includes a first body part, a second body part, a bent part, and a protruding part. The protruding part is connected to the first body part and protrudes relative to the first body part. The end of the protruding part away from the first body part abuts against the bottom wall of the storage cavity. The two ends of the bent part are respectively connected to the first body part and the second body part. The bending portion can be bent to allow the first body portion to switch between a first state and a second state. When the first body portion is in the first state, the first body portion protrudes relative to the second body portion. When the first body portion is in the second state, the first body portion and the second body portion are flush.

2. The battery according to claim 1, characterized in that, The bending portion is provided in multiple ways, and the multiple bending portions are arranged circumferentially around the first body portion.

3. The battery according to claim 2, characterized in that, The first body portion, the second body portion, the protrusion portion, and the bending portion are an integral structure.

4. The battery according to claim 1, characterized in that, The second body portion surrounds the circumferential edge connected to the bent portion, and the bent portion surrounds the circumferential edge connected to the first body portion. The yield strength of both the first body portion and the second body portion is greater than the yield strength of the bent portion.

5. The battery according to claim 1, characterized in that, The battery cell has a receiving hole, and when the first body part is in the first state, the first body part is located in the receiving hole.

6. The battery according to claim 5, characterized in that, The receiving hole is located at the center of the battery cell.

7. The battery according to claim 1, characterized in that, The battery also includes a buffer, with its two sides connected to the bottom wall of the storage cavity and the second body portion, respectively.

8. The battery according to claim 7, characterized in that, Along the height direction of the battery, the size of the buffer is L1, and the size of the protrusion is L2, where L1 < L2.

9. The battery according to claim 7, characterized in that, The buffer has multiple components, which are arranged circumferentially around the first body portion.

10. The battery according to claim 1, characterized in that, The battery cell includes a negative electrode, which is made of silicon material.

11. Electrical equipment, characterized in that, Includes the battery as described in any one of claims 1 to 10.

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