Battery

Abstract

In order to solve the problems that an existing secondary battery produces much gas at high temperature, the internal pressure of a shell is too large, an electrode is degraded, electrolyte is gradually consumed in the charging and discharging process of the battery, and the service life of the battery is shortened, the utility model provides a battery which comprises a shell, at least one pole core and at least one supporting piece, the pole core and the supporting piece are both arranged in the containing cavity, the supporting piece is arranged in the axial direction of the pole core, one end of the supporting piece abuts against the pole core, and the end, away from the pole core, of the supporting piece abuts against the bottom wall or the top wall of the shell; and a storage cavity for storing electrolyte and gas is formed among the side wall of the shell, the bottom wall or the top wall of the shell, the pole core and the supporting piece. According to the battery provided by the invention, the storage cavity has enough space for storing gas, so that the internal pressure when the battery is used at high temperature is effectively reduced, and the degradation of the electrode is delayed; the storage cavity is provided with more electrolyte storage space, and the stored surplus electrolyte can be timely diffused into the pole group diaphragm, so that the service life of the battery is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery. Background Art

[0002] Existing secondary batteries, such as lithium-ion batteries, nickel-metal hydride batteries, and sodium-ion batteries, are rechargeable batteries that have long been favored by the market due to their high energy density, excellent cycle performance, high-temperature resistance, safety, and reliability. For example, nickel-metal hydride batteries currently used in the market generally have an operating temperature range of -30°C to 55°C. When the temperature exceeds 55°C, the electrochemical reaction rate within the battery accelerates, increasing side reactions and gas generation. This excessively high temperature also causes excessive pressure inside the housing and electrode degradation. Furthermore, continuous charging and discharging at high temperatures gradually consumes the electrolyte, reducing the electrolyte level, affecting the battery's charge and discharge performance and shortening its service life. Utility Model Content

[0003] The utility model provides a battery to solve the problems of excessive gas production in existing secondary batteries under high temperature, excessive pressure inside the shell, electrode degradation, gradual consumption of electrolyte during battery charging and discharging, and reduced battery service life.

[0004] The present application provides a nickel-hydrogen battery, comprising a shell, at least one pole core and at least one support member, wherein a accommodating cavity is provided in the shell, the pole core and the support member are both arranged in the accommodating cavity, the support member is arranged in the axial direction of the pole core, one end of the support member abuts against the pole core, and the end of the support member away from the pole core abuts against the bottom wall or top wall of the shell; a storage cavity for storing electrolyte and gas is formed between the side wall of the shell, the bottom wall or top wall of the shell, the pole core and the support member.

[0005] Preferably, each of the support members includes at least two support portions and at least one abutment portion, and each two adjacent support portions intersect to form the abutment portion. The storage cavity is provided between each two adjacent support portions and between the support portion and the housing.

[0006] In the axial direction of the pole core, one end of each support portion abuts against the pole core, and one end of the support portion away from the pole core abuts against the bottom wall or the top wall of the shell.

[0007] Preferably, in the radial direction of the pole core, the surface of the abutting portion abuts against the side wall of the shell.

[0008] Preferably, in the axial direction of the pole core, the height of the support portion is A, and the height of the pole core is B;

[0009] A:B is (1 / 10)~(2 / 5).

[0010] Preferably, the angle between two adjacent support portions is 10-60°.

[0011] Preferably, the contact area between the support portion and the pole core is 30-96 mm.

[0012] Preferably, when at least two support members are provided, the spacing S between two adjacent support members is 0<S≤10mm;

[0013] The gap between two adjacent support members forms the storage cavity.

[0014] Preferably, the electrode core includes a positive electrode sheet and a negative electrode sheet, the thickness of the positive electrode sheet is 0.5~0.53mm, and the thickness of the negative electrode sheet is 0.27~0.30mm.

[0015] Preferably, the aspect ratio coefficient of the positive electrode sheet is 2.4-2.6, and / or the aspect ratio coefficient of the negative electrode sheet is 3.4-3.6.

[0016] In the battery provided by the present application, the support member is arranged in the axial direction of the pole core, one end of the support member abuts against the pole core, and the end of the support member away from the pole core abuts against the bottom wall or top wall of the shell, so that a larger space is formed between the pole core and the bottom wall or top wall of the shell in the axial direction of the pole core, and multiple storage cavities for storing electrolyte and gas can be formed between the bottom wall or top wall of the shell and the pole core, and between the support member and the side wall of the shell; the storage cavity has enough space for storing gas, which can effectively reduce the internal pressure of the battery when used at high temperature and delay electrode degradation; the battery is continuously charged and discharged at high temperature, and the electrolyte is gradually consumed. The storage cavity stores more electrolyte, and the stored surplus electrolyte can be diffused into the pole group diaphragm in time for replenishment, thereby improving the battery cycle performance and thus ensuring the battery service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a battery provided by one embodiment of the present utility model;

[0018] Figure 2 This is a top view of a support member placed inside a battery shell provided by one embodiment of the present utility model.

[0019] 1. Support member; 101. Support portion; 102. Storage cavity; 103. Abutment portion; 2. Pole core; 3. Shell. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] In order to illustrate the technical solution of the present invention, specific embodiments are provided below for description.

[0022] like Figure 1-2 As shown, an embodiment of the present invention provides a battery, including a shell 3, at least one pole core 2 and at least one support member 1, wherein a receiving cavity is provided in the shell 3, the pole core 2 and the support member 1 are both provided in the receiving cavity, and the support member 1 is provided in the axial direction of the pole core 2.

[0023] The housing 3 has a receiving cavity inside, and the pole core 2 and the support member 1 are arranged in the receiving cavity, and the housing 3 is a sealed structure to prevent battery leakage. The support member 1 is arranged in the axial direction of the pole core 2, such as Figure 1 As shown, Figure 1 The dotted line indicated by the middle number 4 is the axial direction of the pole core 2; the support member 1 is arranged on the top or bottom of the pole core 2; Figure 1 As shown, the support member 1 is arranged at the bottom of the pole core 2, which can form a larger electrolyte storage space between the pole core 2 and the bottom of the shell 3 for storing more electrolyte.

[0024] The material of the shell 3 can be metal or aluminum-plastic film, etc. The shape of the shell 3 can be cylindrical, square or special-shaped. The corresponding battery can be a square battery, a soft-pack battery, a cylindrical battery, a special-shaped battery, etc.

[0025] One end of the support member 1 abuts against the pole core 2 , and one end of the support member 1 away from the pole core 2 abuts against the bottom wall or the top wall of the shell 3 .

[0026] like Figure 1 As shown, when the support member 1 is set at the bottom of the pole core 2, one end of the support member 1 abuts against the pole core 2, and the end of the support member 1 away from the pole core 2 abuts against the bottom of the shell 3; when the support member 1 is set at the top of the shell 3, the side of the support member 1 away from the pole core 2 abuts against the top of the shell 3.

[0027] It should be noted that the number of support members 1 is greater than or equal to 1, and the number of pole cores 2 is greater than or equal to 1; when one pole core 2 is provided in the shell 3, the number of support members 1 can be one or greater than one; when two pole cores 2 or more than two pole cores 2 are provided in the shell 3, the number of support members 1 can be one or more than one.

[0028] The storage chamber 102 for storing electrolyte and gas is formed between the side wall of the shell 3 , the bottom wall or the top wall of the shell 3 , the pole core 2 and the support member 1 .

[0029] Specifically, in the axial direction of the pole core 2, the support member 1 is disposed between the pole core 2 and the bottom wall of the housing 3. The gap between the support member 1 and the side wall of the housing 3 forms a storage chamber 102, and the gap between the bottom wall of the housing 3 and the pole core 2 forms a storage chamber 102. The storage chamber 102 can be used to store electrolyte and gas. When the support member 1 is disposed between the pole core 2 and the top wall of the housing 3, the gap between the support member 1 and the side wall of the housing 3 forms a storage chamber 102, and the gap between the top wall of the housing 3 and the pole core 2 forms a storage chamber 102. The storage chamber 102 can be used to store electrolyte and gas.

[0030] When the number of support members 1 is one, the gap between the support member 1 and the side wall of the housing 3 forms a storage cavity 102. When the number of support members 1 is greater than one, two or more support members 1 are spaced apart between the pole core 2 and the bottom wall of the housing 3, or two or more support members 1 are spaced apart between the pole core 2 and the top wall of the housing 3; in this case, the gap between the support member 1 and the side wall of the housing 3 forms a storage cavity 102, and the gap between two adjacent support members 1 also forms a storage cavity 102.

[0031] In the battery provided in the present application, the support member 1 is arranged in the axial direction of the pole core 2, one end of the support member 1 abuts against the pole core 2, and the end of the support member 1 away from the pole core 2 abuts against the bottom wall or top wall of the shell 3, so that a larger space is formed between the pole core 2 and the bottom wall or top wall of the shell 3 in the axial direction of the pole core 2, and a storage chamber 102 for storing electrolyte and gas can be formed between the support member 1 and the side wall of the shell 3, and the storage chamber 102 is used to store electrolyte and gas; the storage chamber 102 has enough space for storing gas, which can effectively reduce the internal pressure of the battery when used at high temperature and delay electrode degradation; during the continuous charging and discharging operation of the battery at high temperature, the electrolyte is gradually consumed, and the storage chamber 102 has more space for storing electrolyte, and the stored surplus electrolyte can be diffused into the pole group diaphragm in time for replenishment, thereby improving the battery cycle performance and thus ensuring the battery service life.

[0032] The battery provided in this application, when the battery is a nickel-metal hydride battery, can store a large amount of gas and electrolyte in the storage cavity 102, so that the battery can operate at a temperature above 85°C, and can reach an ultra-high temperature resistance of up to 105°C.

[0033] A plurality of storage cavities 102 are provided between the support member 1 and the side wall of the housing 3 , and the storage cavities 102 are used to store electrolyte and gas.

[0034] Specifically, at least one storage cavity 102 is provided between the support member 1 and the side wall of the housing 3. The storage cavity 102 can be used to store electrolyte and gas. Figure 2 As shown, two storage chambers 102 are provided between the side wall of the housing 3 and the support portion 101 .

[0035] In this embodiment, each of the support members 1 includes at least two support portions 101 and at least one abutment portion 103. Every two adjacent support portions 101 intersect to form the abutment portion 103. The storage cavity 102 is provided between every two adjacent support portions 101 and between the support portion 101 and the shell 3.

[0036] Specifically, the support portion 101 is supported between the pole core 2 and the housing 3, forming a storage chamber 102 for storing electrolyte and gas between the pole core 2 and the housing 3. Two adjacent support portions 101 intersect to form an abutment portion 103, which is used to abut against the side wall of the housing 3, supporting the pole core 2 and preventing it from loosening. At the same time, because the two support portions 101 intersect, a gap exists between adjacent support portions 101 in the axial direction of the pole core 2, which also serves as the storage chamber 102. The distance between the two support portions 101 gradually increases from the abutment portion 103 toward the direction away from the abutment portion 103.

[0037] When one end of the support portion 101 away from the abutting portion 103 abuts against the side wall of the shell 3 , a gap is left between the support portion 101 and the side wall of the shell 3 . The gap also serves as a storage cavity 102 for storing electrolyte and gas.

[0038] In this embodiment, in the axial direction of the pole core 2 , one end of each support portion 101 abuts against the pole core 2 , and one end of the support portion 101 away from the pole core 2 abuts against the bottom wall or the top wall of the shell 3 .

[0039] Specifically, such as Figure 1 As shown, in the axial direction of the pole core 2, when the support member 1 is arranged between the pole core 2 and the bottom wall of the shell 3, one end of the support portion 101 abuts against the pole core 2, and the other end of the support portion 101 abuts against the bottom wall of the shell 3; when the support member 1 is arranged between the pole core 2 and the top wall of the shell 3, one end of the support portion 101 abuts against the pole core 2, and the other end of the support portion 101 abuts against the top wall of the shell 3.

[0040] like Figure 2 As shown, in this embodiment, in the radial direction of the pole core 2 , the abutting portion 103 abuts against the side wall of the housing 3 .

[0041] The radial direction of the pole core 2 refers to the direction perpendicular to the axial direction of the pole core 2. In the radial direction of the pole core 2, the surface of the abutment portion 103 abuts against the side wall of the housing 3, which plays a role in fixing the support member 1, preventing the support member 1 from shaking, and facilitating the support member 1 to be stabilized by the side wall of the housing 3.

[0042] The surface of the abutting portion 103 abuts against the side wall of the shell 3, that is, the abutting surface of the abutting portion 103 is adapted to the structure of the abutting position of the shell 3. For example, when the abutting position of the shell 3 is a planar structure, the corresponding abutting surface of the abutting portion 103 is a planar structure; when the abutting position of the shell 3 is an arcuate structure, the corresponding abutting surface of the abutting portion 103 is an arcuate structure.

[0043] In this embodiment, the abutting portion 103 is a point-shaped structure, or the abutting portion 103 is a surface-shaped structure.

[0044] Specifically, such as Figure 2 As shown, the support portion 101 can be plate-shaped, such as forming at least two folded plates by bending the support member 1, and the folded plate is the support portion 101. At this time, the abutment portion 103 is the intersection between the two folded plates, and the abutment portion 103 is a point-like structure; the structure formed by the corresponding two adjacent support portions 101 and the abutment portion 103 has a triangular cross-sectional shape.

[0045] The support member 1 is bent multiple times to form at least three support parts 101, and the abutment part 103 is located between the two support parts 101. At this time, the abutment part 103 is a planar structure, and the abutment part 103 can be a plane or an arc surface; the structure formed by the corresponding two support parts 101 and the abutment part 103 has a cross-sectional shape of an arch, a quadrilateral, etc.

[0046] The cross-sectional shape of the support member 1 may also be a polygon, such as a pentagon, a hexagon, an octagon, etc.

[0047] The support member 1 is bent to form at least two support portions 101. The number of support portions 101 formed after the support member 1 is bent can be determined based on the bottom area of ​​the pole core 2 and the number of pole cores 2 in the housing 3. Figure 2 As shown, the number of support portions 101 formed after the support member 1 is bent is four.

[0048] A storage cavity 102 is formed between two adjacent support portions 101. The space between the two support portions 101 is large, allowing for storage of more electrolyte and gas, the latter being generated during the battery's charge and discharge process. The storage cavity 102 has ample room for gas storage, effectively reducing the internal pressure of the battery during high-temperature operation and slowing electrode degradation. As the battery continuously charges and discharges at high temperatures, the electrolyte is gradually consumed. The storage cavity 102 has ample room for electrolyte storage, allowing any excess electrolyte to diffuse into the electrode assembly diaphragm for replenishment, thereby ensuring the battery's operating life.

[0049] In this embodiment, a plurality of the abutting portions 103 are arranged at intervals in the radial direction of the pole core 2 ; and at least one supporting portion 101 is provided between every two adjacent abutting portions 103 .

[0050] In this embodiment, in the axial direction of the pole core 2, the height of the support portion 101 is A, and the height of the pole core 2 is B;

[0051] A:B is (1 / 10)~(2 / 5).

[0052] Specifically, such as Figure 1 As shown, in the axial direction of the pole core 2, the height of the pole core 2 is B. In the axial direction of the pole core 2, the height of the support portion 101 is A. When the support member 1 is arranged between the pole core 2 and the bottom of the housing 3, A is the straight-line distance between the support portion 101 and the inner wall of the bottom of the housing 3; correspondingly, when the support member 1 is arranged between the pole core 2 and the top of the housing 3, A is the straight-line distance between the support portion 101 and the inner wall of the top of the housing 3.

[0053] The minimum ratio of A to B is 1 / 10, and the maximum ratio is 2 / 5. The ratio can be anywhere between (1 / 10) and (2 / 5). When the ratio of A to B is within this range, the distance between the pole core 2 and the housing 3 in the axial direction of the pole core 2 is greater, creating a larger storage cavity 102 capable of storing more gas and electrolyte. This effectively reduces the internal pressure of the battery during high-temperature use, slows electrode degradation, and improves the battery's high-temperature resistance. Furthermore, the battery can store more electrolyte and increase its cycle life.

[0054] In this embodiment, the angle between two adjacent support portions 101 is 10-60°.

[0055] Specifically, two adjacent support portions 101 intersect with each other, forming an angle of 10° to 60° between the two adjacent support portions 101 , which can stably support the pole core 2 .

[0056] More preferably, the angle between two adjacent support portions 101 is 25-35°.

[0057] In this embodiment, the contact area between the support portion 101 and the pole core 2 is 30-96 mm.

[0058] Specifically, the contact area of ​​the support portion 101 on the pole core 2 is in the range of 30 to 96 mm, which can better support the pole core 2 while avoiding damage to the pole core 2.

[0059] More preferably, the contact area between the support portion 101 and the pole core 2 is 25-30 mm.

[0060] In this embodiment, when at least two support members 1 are provided, the spacing S between two adjacent support members 1 is 0<S≤10mm;

[0061] The gap between two adjacent support members 1 forms the storage cavity 102 .

[0062] Specifically, when the number of support members 1 is greater than one, multiple support members 1 are spaced apart in the radial direction of the pole core 2, and the gap between each two adjacent support members 1 forms a storage cavity 102, which can also store electrolyte and gas.

[0063] The distance between two adjacent support members 1 is limited to the range of 0<S≤10, so as to facilitate the storage of more electrolyte and gas.

[0064] In some preferred embodiments, when at least two support members 1 are provided, the spacing S between two adjacent support members 1 is 0<S≤6mm.

[0065] In this embodiment, the electrode core 2 includes a positive electrode sheet, and the thickness of the positive electrode sheet is 0.5-0.53 mm.

[0066] Specifically, the thickness of the positive electrode sheet ranges from 0.5 to 0.53 mm. For example, the thickness of the positive electrode sheet can be 0.5, 0.51, 0.52, 0.53 mm, etc. As long as the thickness of the positive electrode sheet is within the range of 0.5 to 0.53 mm, it can be used. Limiting the thickness of the positive electrode sheet to the range of 0.5 to 0.53 mm facilitates the preparation of the electrode core 2 to fit into the battery shell while achieving the desired battery capacity, energy density, coulombic efficiency, rate performance, and other electrical properties.

[0067] In this embodiment, the aspect ratio coefficient of the positive electrode sheet is 2.4-2.6.

[0068] The aspect ratio of the positive electrode sheet is 2.4-2.6, specifically, the ratio of the length to the width of the positive electrode sheet is (2.4-2.6):1. The aspect ratio of the positive electrode sheet is limited to facilitate the preparation of the electrode core 2 into the battery shell while achieving the specified battery capacity, energy density, coulombic efficiency, rate performance and other electrical properties.

[0069] In this embodiment, the electrode core 2 includes a negative electrode sheet, and the thickness of the negative electrode sheet is 0.27-0.30 mm.

[0070] Specifically, the thickness of the negative electrode sheet ranges from 0.27 to 0.30 mm. For example, the thickness of the negative electrode sheet can be 0.27, 0.28, 0.29, 0.30 mm, etc., as long as the thickness of the negative electrode sheet is within the range of 0.27 to 0.30 mm. Limiting the thickness of the negative electrode sheet to the range of 0.27 to 0.30 mm facilitates the preparation of the electrode core 2 to fit into the battery shell while achieving the desired battery performance, such as capacity, energy density, coulombic efficiency, and rate capability.

[0071] In this embodiment, the aspect ratio coefficient of the negative electrode sheet is 3.4-3.6.

[0072] The negative electrode sheet has an aspect ratio of 3.4 to 3.6, specifically a ratio of the length to the width of the negative electrode sheet of (3.4 to 3.6):1. This aspect ratio is determined to facilitate the insertion of the prepared electrode core 2 into the battery shell while achieving the desired battery performance, including capacity, energy density, coulombic efficiency, and rate capability.

[0073] In this embodiment, the support member 1 is made of polypropylene (PP), PE (polyethylene) or PS (polystyrene).

[0074] The battery provided herein comprises a positive electrode sheet comprising a positive electrode current collector and a positive electrode active material layer, both of which are prior art. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, both of which are also prior art.

[0075] The above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will appreciate that modifications may be made to the technical solutions described in the aforementioned embodiments, or that some of the technical features may be replaced with equivalents. These modifications or replacements do not deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention and are therefore intended to be included within the scope of protection of the present invention.

Claims

1. A battery, characterized in that: The invention comprises a shell (3), at least one pole core (2) and at least one support member (1); a receiving cavity is provided in the shell (3); the pole core (2) and the support member (1) are both provided in the receiving cavity; the support member (1) is provided in the axial direction of the pole core (2); one end of the support member (1) abuts against the pole core (2); and one end of the support member (1) away from the pole core (2) abuts against the bottom wall or the top wall of the shell (3); and a storage cavity (102) for storing electrolyte and gas is formed between the side wall of the shell (3), the bottom wall or the top wall of the shell (3), the pole core (2) and the support member (1).

2. The battery according to claim 1, characterized in that Each of the support members (1) comprises at least two support portions (101) and at least one abutting portion (103); each two adjacent support portions (101) intersect to form the abutting portion (103); and the storage cavity (102) is provided between each two adjacent support portions (101) and between the support portion (101) and the housing (3); In the axial direction of the pole core (2), one end of each support portion (101) abuts against the pole core (2), and one end of the support portion (101) away from the pole core (2) abuts against the bottom wall or the top wall of the shell (3).

3. The battery according to claim 2, characterized in that In the radial direction of the pole core (2), the surface of the abutment portion (103) abuts against the side wall of the housing (3).

4. The battery according to claim 2, characterized in that In the axial direction of the pole core (2), the height of the support portion (101) is A, and the height of the pole core (2) is B; A:B is (1 / 10)~(2 / 5).

5. The battery according to claim 2, characterized in that The included angle between two adjacent support portions (101) is 10-60°.

6. The battery according to claim 2, characterized in that The contact area between the support portion (101) and the pole core (2) is 30-96 mm.

7. The battery according to claim 1, characterized in that When at least two support members (1) are provided, the spacing S between two adjacent support members (1) is 0<S≤10 mm; The gap between two adjacent support members (1) forms the storage cavity (102).

8. The battery according to claim 1, characterized in that The pole core (2) comprises a positive electrode sheet and a negative electrode sheet, the thickness of the positive electrode sheet is 0.5-0.53 mm, and the thickness of the negative electrode sheet is 0.27-0.30 mm.

9. The battery according to claim 8, characterized in that The aspect ratio coefficient of the positive electrode sheet is 2.4-2.6, and / or the aspect ratio coefficient of the negative electrode sheet is 3.4-3.6.

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