Battery and electronic device

Abstract

The present disclosure provides a battery and an electronic device, and relates to the technical field of batteries. The battery comprises a plurality of cell units and a circuit protection structure. The plurality of cell units are arranged at intervals along a first direction. Each cell unit comprises a plurality of positive electrode layers, a plurality of separator layers and a plurality of negative electrode layers. The plurality of positive electrode layers, the plurality of separator layers and the plurality of negative electrode layers are alternately stacked in sequence along a second direction. The first direction and the second direction are both perpendicular to the thickness direction of the battery. The circuit protection structure is electrically connected to each cell unit. The present disclosure can reduce the possibility of the battery swelling in each direction, thereby reducing the size of the space reserved in the thickness direction of the battery in the electronic device, and further reducing the waste of the internal space of the electronic device. In addition, the circuit protection structure can cut off the part of the cell unit, thereby reducing the possibility of the entire battery malfunctioning due to the malfunction of a single cell unit.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and in particular to a battery and an electronic device. Background Technology

[0002] With the development of technology, people have increasingly higher requirements for the energy density of batteries in electronic devices. In related technologies, batteries are often placed inside the battery compartment of electronic devices, with one surface of the battery exposed perpendicular to its thickness direction. The thickness directions of the positive and negative electrode layers inside the battery are often the same as the thickness direction of the battery.

[0003] As electronic devices are used, the thickness of the positive and negative electrode layers inside the battery increases. This causes the battery to expand in the thickness direction. Therefore, electronic devices often need to reserve some space in the thickness direction of the battery to accommodate the expanded portion, which leads to a waste of internal space. In addition, when an electronic device is involved in a collision, the frame may squeeze the battery, potentially causing localized damage and failure of the battery, and ultimately leading to the failure of the entire battery. Utility Model Content

[0004] This disclosure provides a battery and an electronic device that can solve the aforementioned technical problems existing in related technologies. The technical solution is as follows: In a first aspect, a battery is provided, the battery comprising a plurality of battery cell units and a circuit protection structure; The plurality of battery cell units are arranged at intervals along a first direction. Each battery cell unit includes a plurality of positive electrode layers, a plurality of separator layers, and a plurality of negative electrode layers. The plurality of positive electrode layers, the plurality of separator layers, and the plurality of negative electrode layers are stacked alternately in sequence along a second direction. The first direction and the second direction are both perpendicular to the thickness direction of the battery. The circuit protection structure is electrically connected to each battery cell unit.

[0005] In some possible implementations, each cell unit also includes multiple positive tabs, multiple negative tabs, a first bus structure, and a second bus structure; The plurality of positive electrode tabs are connected to the plurality of positive electrode layers in a one-to-one correspondence, and the plurality of negative electrode tabs are connected to the plurality of negative electrode layers in a one-to-one correspondence; The first busbar structure and the second busbar structure are arranged at intervals, the first busbar structure is connected to the plurality of positive tabs, and the second busbar structure is connected to the plurality of negative tabs; The first and second bus structures of each battery cell are connected to the circuit protection structure, respectively.

[0006] In some possible implementations, the battery further includes a housing in which the first busbar structure and the second busbar structure are formed.

[0007] In some possible implementations, each cell unit also includes multiple reinforcing layers, which are arranged one-to-one between the multiple separator layers and the multiple positive tabs.

[0008] In some possible implementations, the battery further includes at least one insulating structure, each insulating structure being located between two adjacent cell units to insulate the two adjacent cell units.

[0009] In some possible implementations, there is a gap between adjacent insulating structures and cell units in the second direction.

[0010] In some possible implementations, the spacing ranges from 1 μm to 500 μm.

[0011] In some possible implementations, the insulation structure is made of a flame-retardant material.

[0012] In some possible implementations, the periphery of the orthogonal projection of the membrane layer onto a designated plane protrudes beyond the periphery of the orthogonal projection of the negative electrode layer onto the designated plane, and the periphery of the orthogonal projection of the negative electrode layer onto the designated plane protrudes beyond the periphery of the orthogonal projection of the positive electrode layer onto the designated plane, wherein the designated plane is a plane perpendicular to the second direction.

[0013] In some possible implementations, the second direction is the same as the first direction, or the second direction is perpendicular to the first direction.

[0014] In a second aspect, an electronic device is provided, the electronic device comprising a battery provided in the first aspect and its possible implementations.

[0015] In some possible implementations, the electronic device also has a battery compartment, in which the battery is located, with the sidewall of the battery abutting against the inner wall of the battery compartment.

[0016] The beneficial effects of the technical solution provided in this disclosure include at least the following: In each battery cell, the thickness direction of the positive and negative electrode layers is a second direction perpendicular to the battery's thickness direction. Therefore, even if the thickness of the positive and negative electrode layers increases, the battery will only tend to expand along the second direction, and will hardly tend to expand along the thickness direction. When the battery is placed in the battery compartment of an electronic device, the inner wall of the battery compartment will be in contact with the side of the battery perpendicular to the second direction, thereby constraining the battery and limiting its expansion in the second direction. At the same time, since increasing the thickness of the positive and negative electrode layers will hardly cause the battery to expand along the thickness direction, the possibility of the battery expanding in any direction can be reduced. This reduces the size of the space reserved in the electronic device to accommodate the battery's expansion, and thus reduces the waste of internal space in the electronic device. In addition, the battery is composed of multiple cell units, and each cell unit is electrically connected to the circuit protection structure. When a cell unit fails, the battery internal resistance and the internal resistance of the cell unit detected by the circuit protection structure will also change, thereby determining that the cell unit has failed. At this time, the circuit protection structure can cut off the circuit of that part, thereby reducing the possibility that the entire battery will fail due to the failure of a single cell unit.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is one of the structural schematic diagrams of a battery provided in the embodiments of this disclosure; Figure 2 This is a schematic diagram of the structure of a battery cell unit provided in an embodiment of this disclosure; Figure 3 This is a partial structural schematic diagram of a battery cell unit provided in an embodiment of this disclosure; Figure 4 This is the second schematic diagram of a battery cell unit provided in this embodiment.

[0020] Figure label: 1. Cell unit; 11. Positive electrode layer; 111. Positive electrode tab; 12. Separator layer; 13. Negative electrode layer; 131. Negative electrode tab; 14. First busbar structure; 15. Second busbar structure; 16. Reinforcing layer; 2. Insulation structure. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other. This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] This disclosure provides a battery. Combined with... Figure 1 , Figure 2 As shown, the battery includes multiple cell units 1 and a circuit protection structure. The multiple cell units 1 are arranged at intervals along a first direction. Each cell unit 1 includes multiple positive electrode layers 11, multiple separator layers 12, and multiple negative electrode layers 13. The multiple positive electrode layers 11, multiple separator layers 12, and multiple negative electrode layers 13 are alternately stacked along a second direction, wherein both the first direction and the second direction are perpendicular to the thickness direction of the battery. The circuit protection structure is electrically connected to each cell unit 1.

[0024] Using the battery provided in this embodiment, the thickness direction of the positive electrode layer 11 and the negative electrode layer 13 in each cell unit 1 is a second direction perpendicular to the battery thickness direction. Therefore, even if the thickness of the positive electrode layer 11 and the negative electrode layer 13 increases, the battery will only tend to expand along the second direction, and will hardly tend to expand along the thickness direction. When the battery is placed in the battery compartment of the electronic device, the inner wall of the battery compartment will be in contact with the side wall of the battery perpendicular to the second direction, thereby constraining the battery and limiting its expansion in the second direction. At the same time, since the increase in the thickness of the positive electrode layer 11 and the negative electrode layer 13 will hardly cause the battery to expand along the thickness direction, the possibility of the battery expanding in all directions can be reduced, thereby reducing the size of the space reserved in the electronic device to accommodate the battery expansion portion, and thus reducing the waste of internal space of the electronic device.

[0025] Furthermore, the battery is composed of multiple cell units 1, and each cell unit 1 is electrically connected to the circuit protection structure. When a cell unit 1 fails, the battery internal resistance detected by the circuit protection structure will change, and the internal resistance of the cell unit 1 detected by the circuit protection structure will also change, thereby determining that the cell unit 1 has failed. At this time, the circuit protection structure can cut off the circuit of that part, thereby reducing the possibility that the failure of a single cell unit 1 will cause the entire battery to fail.

[0026] Optionally, the circuit board protection structure is a PCM (Protection Circuit Module) board, which has multiple connection terminals, and the multiple connection terminals are respectively connected to the first bus structure 14 and the second bus structure 15 of each battery cell 1.

[0027] Optionally, one reason for the "increase in the thickness of the positive electrode layer 11 and the negative electrode layer 13" is that as the battery is used, the chemical reaction inside the battery will produce some impurities, which will accumulate on the positive electrode layer 11 or the negative electrode layer 13, thereby increasing the thickness of the positive electrode layer 11 or the negative electrode layer 13.

[0028] Optionally, the positive electrode layer 11 can be a layered structure composed of active materials such as, but not limited to, lithium cobalt oxide and lithium iron phosphate.

[0029] Optionally, the negative electrode layer 13 can be a layered structure composed of materials such as, but not limited to, graphite and silicon.

[0030] Optionally, the membrane layer 12 can be a polymer material layer, which is mainly used to allow ions to pass through in order to form a current loop within the battery cell 1.

[0031] like Figure 2 As shown, in some embodiments, each battery cell 1 further includes multiple positive tabs 111, multiple negative tabs 131, a first bus structure 14, and a second bus structure 15. The multiple positive tabs 111 are connected one-to-one with the multiple positive electrode layers 11, and the multiple negative tabs 131 are connected one-to-one with the multiple negative electrode layers 13. The first bus structure 14 and the second bus structure 15 are arranged at intervals, with the first bus structure 14 connected to the multiple positive tabs 111 and the second bus structure 15 connected to the multiple negative tabs 131.

[0032] In this way, the positive tab 111 can collect the current on the positive electrode layer 11, and the negative tab 131 can collect the current on the negative electrode layer 13, thereby converting the chemical signal into an electrical signal, so that the current can flow more efficiently between the positive electrode layer 11 and the negative electrode layer 13. Furthermore, the first bus structure 14 can collect the current of each positive tab 111 in a single cell unit 1, and the second bus structure 15 can collect the current of each negative tab 131 in a single cell unit 1, thereby enabling the current to flow more efficiently between multiple positive electrode layers 11 and multiple negative electrode layers 13.

[0033] Optionally, the first bus structure 14 and the second bus structure 15 are arranged at intervals along the thickness direction of the battery and are located on both sides of the cell unit 1, so as to reduce the possibility of short circuit between the first bus structure 14 and the second bus structure 15.

[0034] Optionally, the first bus structure 14 and the second bus structure 15 are made of metallic materials, such as aluminum and its alloys, iron and its alloys, steel, etc.

[0035] In some embodiments, the battery further includes a housing, on which a first busbar structure 14 and a second busbar structure 15 are formed.

[0036] In this way, the battery casing not only protects the battery cells but also collects the current from each battery cell, eliminating the need for separate first busbar structure 14 and second busbar structure 15. This reduces the number of internal components and lowers the complexity of the battery's internal structure.

[0037] Alternatively, the casing is made of a metallic material and has insulating arrangements to separate the various busbars. This allows the metallic casing to further constrain battery expansion.

[0038] like Figure 3 As shown, in some embodiments, each cell unit 1 further includes multiple reinforcing layers 16, which are arranged one-to-one between multiple separator layers 12 and multiple positive tabs 111.

[0039] When the battery is dropped or squeezed, the positive tab 111 is prone to deformation, which may cause the positive tab 111 to insert into the separator layer 12 or the separator layer 12 to shrink inward, which may easily cause the positive tab 111 to come into contact with the negative electrode layer 13. The positive tab 111 is often made of aluminum. Once the aluminum positive tab 111 comes into contact with the negative electrode layer 13, it will release a lot of heat, which may cause thermal runaway.

[0040] Therefore, multiple reinforcing layers 16 are arranged one-to-one between multiple separator layers 12 and multiple positive tabs 111. The positive tabs 111 are difficult to pierce the reinforcing layers 16, so that the reinforcing layers 16 can form a barrier to the positive tabs 111, thereby reducing the possibility of contact between the positive tabs 111 and the negative electrode layer 13, and thus reducing the possibility of battery thermal runaway.

[0041] The phrase “multiple reinforcing layers 16 are arranged one-to-one between multiple diaphragm layers 12 and multiple positive tabs 111” means that: a positive tab 111 (a designated positive tab) is located between a diaphragm layer 12 (a designated diaphragm layer) and a positive electrode layer 11 (a designated diaphragm layer), and the reinforcing layer 16 corresponding to the designated positive tab is located between the designated diaphragm layers and between the designated positive tab and the designated diaphragm layer, with each positive tab 111 corresponding to one reinforcing layer 16.

[0042] Alternatively, the reinforcing layer 16 may be a ceramic layer.

[0043] like Figure 1As shown, in some embodiments, the battery further includes at least one insulating structure 2, each insulating structure 2 being located between two adjacent cell units 1 to insulate the two adjacent cell units 1.

[0044] Thus, through the insulation structure 2, each cell unit 1 can be separated, allowing each cell unit 1 to work independently. When one cell unit 1 fails, the other cell units 1 will not be affected by the failed cell unit 1, thereby reducing the possibility of the battery failing as a whole due to a local fault, and thus improving the safety of the battery during use.

[0045] Optionally, the insulating structure 2 can be in the form of a sheet.

[0046] In some embodiments, there is a gap between adjacent insulating structures 2 and battery cells 1 in a second direction.

[0047] Thus, when an electronic device is impacted and the battery is squeezed, the gap between the adjacent insulating structure 2 and the cell unit 1 in the second direction can reduce the possibility of the cell unit 1 being squeezed by the insulating structure 2, thereby reducing the possibility of damage to the battery unit.

[0048] In some embodiments, the spacing ranges from 1 μm to 500 μm.

[0049] Specifically, when the spacing is less than 1μm, it is too small, increasing the likelihood of compression between the cell unit 1 and the insulation structure 2 when the battery is compressed, thus reducing battery safety. When the spacing is greater than 500μm, it is too large, wasting internal battery space and leading to a decrease in battery energy density. Therefore, setting the spacing range to 1μm~500μm ensures sufficient battery safety while maintaining a high energy density.

[0050] The phrase "the spacing ranges from 1μm to 500μm" means that "the minimum spacing between adjacent insulating structures 2 and cell units 1 in the second direction ranges from 1μm to 500μm".

[0051] Optionally, the spacing can be, for example, but not limited to, 1μm, 50μm, 100μm, 150μm, 200μm, 250μm, 300μm, 350μm, 400μm, 450μm or 500μm, and the embodiments disclosed herein do not limit this.

[0052] In some embodiments, the insulating structure 2 is made of a flame-retardant material.

[0053] Thus, when one of the battery cells 1 experiences thermal runaway, the insulation structure 2, being made of flame-retardant material, can prevent other battery cells 1 from being affected by the thermally runaway cell 1. This reduces the possibility of overall battery thermal runaway due to localized thermal runaway, thereby improving battery safety during use.

[0054] like Figure 2 As shown, in some embodiments, the periphery of the orthogonal projection of the membrane layer 12 onto a specified plane protrudes beyond the periphery of the orthogonal projection of the negative electrode layer 13 onto a specified plane, and the periphery of the orthogonal projection of the negative electrode layer 13 onto a specified plane protrudes beyond the periphery of the orthogonal projection of the positive electrode layer 11 onto a specified plane, wherein the specified plane is a plane perpendicular to the second direction.

[0055] In this way, the membrane layer 12 can ensure that the negative electrode layer 13 and the positive electrode layer 11 are separated to avoid direct contact between the negative electrode layer 13 and the positive electrode layer 11, thereby reducing the possibility of short circuit between the positive electrode layer 11 and the negative electrode layer 13.

[0056] Furthermore, taking a lithium battery as an example, since the periphery of the orthogonal projection of the negative electrode layer 13 on the specified plane protrudes beyond the periphery of the orthogonal projection of the positive electrode layer 11 on the specified plane, when lithium ions are extracted from the positive electrode, they can be embedded into various positions of the negative electrode layer 13, thereby reducing the possibility of lithium ions precipitating from the edge of the negative electrode layer 13 to form lithium dendrites, thus improving the safety of the battery during use.

[0057] like Figure 1 As shown, in some embodiments, the second direction is perpendicular to the first direction.

[0058] Thus, when multiple battery cells 1 are stacked, since the second direction is perpendicular to the first direction, that is, the arrangement direction of the battery cells 1 is perpendicular to the thickness direction of the battery cells 1, the size of the battery can be flexibly controlled in both directions, thereby making it easier to control the overall size of the battery.

[0059] like Figure 4 As shown, in some embodiments, the second direction is the same as the first direction.

[0060] Thus, when multiple battery cell units 1 are stacked, since the second direction is the same as the first direction, that is, the arrangement direction of the battery cell unit 1 is the same as the thickness direction of the battery cell unit 1, the distance between the insulation structure 2 and the battery cell unit 1 is easier to control when multiple battery cell units 1 are stacked, and the processing difficulty is lower.

[0061] Based on the same concept, this disclosure also provides an electronic device, which includes the battery mentioned above.

[0062] In some embodiments, the electronic device further includes a battery compartment, in which a battery is located, with the sidewalls of the battery abutting against the inner wall of the battery compartment.

[0063] Thus, the thickness direction of the positive electrode layer 11 and the negative electrode layer 13 in each cell unit 1 is a second direction perpendicular to the thickness direction of the battery. Therefore, even if the thickness of the positive electrode layer 11 and the negative electrode layer 13 increases, the battery will only tend to expand along the second direction, and will hardly tend to expand along the thickness direction. When the battery is placed in the battery compartment of the electronic device, the inner wall of the battery compartment will be in contact with the side of the battery perpendicular to the second direction, thereby constraining the battery and limiting its expansion in the second direction. At the same time, since the increase in the thickness of the positive electrode layer 11 and the negative electrode layer 13 will hardly cause the battery to expand along the thickness direction, the possibility of the battery expanding in any direction can be reduced, thereby reducing the size of the space reserved in the electronic device to accommodate the battery expansion, and thus reducing the waste of internal space in the electronic device.

[0064] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0065] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A battery, characterized by, The battery includes multiple cell units (1) and a circuit protection structure; The plurality of battery cell units (1) are arranged at intervals along a first direction. Each battery cell unit (1) includes a plurality of positive electrode layers (11), a plurality of separator layers (12) and a plurality of negative electrode layers (13). The plurality of positive electrode layers (11), the plurality of separator layers (12) and the plurality of negative electrode layers (13) are stacked alternately in sequence along a second direction. The first direction and the second direction are both perpendicular to the thickness direction of the battery. The circuit protection structure is electrically connected to each battery cell unit (1).

2. The battery of claim 1, wherein, Each cell unit (1) also includes multiple positive tabs (111), multiple negative tabs (131), a first bus structure (14), and a second bus structure (15). The plurality of positive electrode tabs (111) are connected to the plurality of positive electrode layers (11) in a one-to-one correspondence, and the plurality of negative electrode tabs (131) are connected to the plurality of negative electrode layers (13) in a one-to-one correspondence; The first busbar structure (14) and the second busbar structure (15) are arranged at intervals. The first busbar structure (14) is connected to the plurality of positive tabs (111), and the second busbar structure (15) is connected to the plurality of negative tabs (131). In this circuit, the first bus structure (14) and the second bus structure (15) of each battery cell (1) are respectively connected to the circuit protection structure.

3. The battery of claim 2, wherein, The battery also includes a housing, on which the first busbar structure (14) and the second busbar structure (15) are formed.

4. The battery of claim 2, wherein, Each cell unit (1) also includes multiple reinforcing layers (16), which are arranged one-to-one between the multiple separator layers (12) and the multiple positive tabs (111).

5. The battery of claim 1, wherein, The battery also includes at least one insulating structure (2), each insulating structure (2) being located between two adjacent cell units (1) to insulate the two adjacent cell units (1).

6. The battery of claim 5, wherein, There is a gap between the adjacent insulating structure (2) and the cell unit (1) in the second direction.

7. The battery of claim 6, wherein, The spacing ranges from 1μm to 500μm.

8. The battery of claim 5, wherein, The insulation structure (2) is made of flame-retardant material.

9. The battery of claim 1, wherein, The periphery of the orthogonal projection of the membrane layer (12) on the designated plane protrudes beyond the periphery of the orthogonal projection of the negative electrode layer (13) on the designated plane, and the periphery of the orthogonal projection of the negative electrode layer (13) on the designated plane protrudes beyond the periphery of the orthogonal projection of the positive electrode layer (11) on the designated plane, wherein the designated plane is a plane perpendicular to the second direction.

10. The battery according to any one of claims 1 to 9, characterized in that, The second direction is the same as the first direction, or the second direction is perpendicular to the first direction.

11. An electronic device, comprising: Includes the battery as described in any one of claims 1-10.

12. The electronic device of claim 11, wherein, The electronic device also has a battery compartment, in which the battery is located, and the sidewall of the battery is attached to the inner wall of the battery compartment.

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