Battery and electric device

Abstract

The utility model provides a battery and a power utilization device, relates to the technical field of battery safety, and aims to solve the problems that a naked battery cell is too close to an upper cover assembly, so that a protruding position of the upper cover assembly extrudes a roll core, powder of a pole piece falls off, and safety risks are brought to a certain extent. The battery provided by the utility model comprises a cover plate assembly, a battery cell and a shell, an opening is formed in one end of the shell, the battery cell is arranged in the shell, and the cover plate assembly covers the opening; protruding corner parts are formed at the two ends of the side, facing the battery cell, of the cover plate assembly. An avoiding part is formed in the position, corresponding to the corner part, of one end, facing the cover plate assembly, of the battery cell, the avoiding part is provided with a liquid supplementing assembly, and electrolyte is stored in the liquid supplementing assembly; and when the battery cell generates gas and expands, the liquid supplementing assembly arranged between the corner part and the avoiding part is pressed and releases the electrolyte.

Description

Technical Field

[0001] The utility model relates to the technical field of battery safety, and particularly relates to a battery and an electrical device using the same. Background Art

[0002] The development of battery technology needs to consider various design factors simultaneously. For example, performance parameters such as energy density and cycle life. At present, to improve the energy density of the battery cell, the distance from the top of the bare battery cell to the top cover can be shortened, which effectively improves the space utilization rate. However, this also brings some problems. Due to the reduction of the top space, the protruding part of the lower plastic corner may squeeze the bare battery cell, resulting in powder falling off the electrode sheet, bringing safety risks. In addition, after the battery undergoes long-term charge and discharge cycles, the electrolyte in the battery cell will gradually be consumed and reduced, resulting in a decrease in battery capacity and a gradual deterioration of performance.

[0003] Therefore, there is an urgent need to provide a battery and an electrical device using the same to solve the problems existing in the prior art to a certain extent. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a battery and an electrical device using the same to solve, to a certain extent, the problem that the distance between the bare battery cell and the upper cover assembly is too close, resulting in the protruding position of the upper cover assembly squeezing the wound core, causing powder falling off the electrode sheet and bringing safety risks.

[0005] A battery provided by the utility model includes a cover plate assembly, a battery cell and a housing; one end of the housing forms an opening, the battery cell is arranged in the housing, and the cover plate assembly seals the opening; convex corner parts are formed at both ends of the side of the cover plate assembly facing the battery cell; at one end of the battery cell facing the cover plate assembly and corresponding to the position of the corner parts, a relief part is formed, a liquid replenishing assembly is arranged in the relief part, and the liquid replenishing assembly stores electrolyte; when the battery cell generates gas and expands, the liquid replenishing assembly arranged between the corner parts and the relief part is pressed and releases the electrolyte.

[0006] Wherein, the liquid replenishing assembly includes a liquid replenishing chamber and an outer shell, the electrolyte is contained in the liquid replenishing chamber, the liquid replenishing chamber is arranged in the outer shell, and a perforation is formed at the bottom of the outer shell for the entry of gas and the outflow of electrolyte.

[0007] Specifically, a scoring part is formed on one side of the liquid replenishing chamber facing the perforation, and the thickness of the scoring part is less than the thickness of other positions of the liquid replenishing chamber.

[0008] Specifically, the housing includes a main body and an upper cover. The perforation is formed at the bottom of the main body. An opening is formed at the top of the main body, and the upper cover seals the opening. A puncture portion is formed at the corner portion, and a through hole is formed at the position of the upper cover corresponding to the puncture portion. When the battery cell generates gas and expands, the puncture portion can pass through the through hole and the upper cover to pierce the liquid replenishment chamber.

[0009] Wherein, the battery cell includes a positive electrode sheet, a negative electrode sheet and a separator. Cutting portions are formed on the positive electrode sheet, the negative electrode sheet and the separator. After the positive electrode sheet, the negative electrode sheet and the separator are wound to form the battery cell, the cutting portions are wound to form the avoidance portion.

[0010] Specifically, the length of the cutting portion is a, and the length of the corner portion is c, and a≥2c.

[0011] Specifically, the height of the cutting portion is b, and the height of the corner portion is d, and b>d.

[0012] Furthermore, the cover plate assembly includes a cover plate main body and a lower plastic. The lower plastic is located between the battery cell and the cover plate main body, and the lower plastic is connected to the cover plate main body. The corner portions are formed at both ends of the lower plastic.

[0013] Still further, the battery provided by the present invention further includes a covering member. The covering member covers the battery cell and the liquid replenishment assembly, and confines the liquid replenishment assembly within the avoidance portion.

[0014] Compared with the prior art, the battery provided by the present invention has the following advantages:

[0015] The battery provided by the present invention includes a cover plate assembly, a battery cell and a housing. An opening is formed at one end of the housing. The battery cell is disposed within the housing, and the cover plate assembly seals the opening. Convex corner portions are formed at both ends of the side of the cover plate assembly facing the battery cell. At one end of the battery cell facing the cover plate assembly and corresponding to the position of the corner portion, an avoidance portion is formed. A liquid replenishment assembly is disposed in the avoidance portion, and the liquid replenishment assembly stores electrolyte. When the battery cell generates gas and expands, the liquid replenishment assembly disposed between the corner portion and the avoidance portion is pressed and releases the electrolyte.

[0016] It can be analyzed from this that by forming an avoidance portion at the position corresponding to the corner of the battery cell, it is possible to avoid, to a certain extent, the corner of the cover plate assembly squeezing the battery cell, causing powder falling off the electrode sheet and bringing potential safety hazards. Moreover, since a liquid supplement assembly is also provided at the position of the avoidance portion in this application, on the one hand, the liquid supplement assembly can separate the corner portion from the battery cell, so that the force applied by the corner portion can be absorbed by the liquid supplement assembly. On the other hand, when the pressure of the battery cell gas production and expansion on the liquid supplement assembly continues to increase in this application, the liquid supplement assembly can ultimately be squeezed and ruptured, thereby releasing the electrolyte contained inside.

[0017] It can be understood that during the long-term charge and discharge cycle of the battery, the electrolyte inside the battery cell will gradually be consumed and reduced, resulting in a decrease in battery capacity and performance. Therefore, after the electrolyte in the liquid supplement assembly is released, it can, to a certain extent, supplement the electrolyte in the battery, enabling the battery to recover certain performance, thereby increasing the battery capacity and service life.

[0018] In addition, the present utility model also provides an electrical device using the above battery.

[0019] The electrical device using the battery provided in this application can have a more stable and safe usage process. At the same time, it can also obtain the electrolyte in the liquid supplement assembly after long-term use, restore certain performance, and increase the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is an exploded view of the battery from the first perspective provided by the embodiment of the present utility model;

[0022] Figure 2 It is an exploded view of the battery from the second perspective provided by the embodiment of the present utility model;

[0023] Figure 3 For Figure 2 The partial enlarged view at A in

[0024] Figure 4 It is a structural schematic diagram of the positive electrode sheet in the battery provided by the embodiment of the present utility model;

[0025] Figure 5 It is a structural schematic diagram of the negative electrode sheet in the battery provided by the embodiment of the present utility model;

[0026] Figure 6 Schematic structural diagram of the separator in the battery provided by the embodiment of the present utility model;

[0027] Figure 7 Exploded schematic diagram of the liquid replenishing component in the battery provided by the embodiment of the present utility model from the first perspective;

[0028] Figure 8 Exploded schematic diagram of the liquid replenishing component in the battery provided by the embodiment of the present utility model from the second perspective.

[0029] In the figure: 1 - cover plate assembly; 101 - cover plate main body; 102 - lower plastic; 1021 - corner part; 1022 - puncture part; 2 - battery cell; 201 - positive electrode plate; 202 - negative electrode plate; 203 - separator; 204 - cutting part; 205 - avoidance part; 3 - liquid replenishing component; 301 - liquid replenishing chamber; 3011 - scoring part; 302 - outer shell; 3021 - main body; 3022 - upper cover; 3023 - perforation; 3024 - through hole; 4 - housing; 5 - covering part. Specific embodiments

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are only some of the embodiments of the present application, rather than all of them. Usually, the components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present application.

[0031] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0032] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0033] In the description of the embodiments of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0034] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.

[0035] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" can be used here to describe the relationship between one element and another as shown in the drawings. Such spatial relationship terms are intended to include different orientations of the device during use or operation in addition to the orientation depicted in the drawings.

[0036] The terms used herein are only for describing various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. The terms "comprises", "comprising", and "having" list the stated features, quantities, operations, components, elements, and / or combinations thereof that exist, but do not preclude the existence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0037] Due to manufacturing techniques and / or tolerances, changes in the shapes shown in the drawings may occur. Therefore, the examples described here are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacturing.

[0038] The features of the examples described here can be combined in various ways that will be obvious after understanding the disclosure of the present application. In addition, although the examples described here have various configurations, as will be obvious after understanding the disclosure of the present application, other configurations are possible. Additionally, the technical solutions between the various embodiments can be combined with each other, but it must be based on what can be achieved by those of ordinary skill in the art. When the combination of technical solutions results in contradictions or cannot be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0039] As Figure 1 shown in combination with Figure 2 the present utility model provides a battery, which includes a cover plate assembly 1, a battery cell 2 and a housing 4; one end of the housing 4 forms an opening, the battery cell 2 is disposed inside the housing 4, and the cover plate assembly 1 seals the opening; both ends of the side of the cover plate assembly 1 facing the battery cell 2 form protruding corner portions 1021; at one end of the battery cell 2 facing the cover plate assembly 1 and corresponding to the position of the corner portion 1021, a relief portion 205 is formed, a liquid supplement assembly 3 is disposed in the relief portion 205, and an electrolyte is stored in the liquid supplement assembly 3; when the battery cell 2 generates gas and expands, the liquid supplement assembly 3 disposed between the corner portion 1021 and the relief portion 205 is pressed and releases the electrolyte.

[0040] Compared with the prior art, the battery provided by the present utility model has the following advantages:

[0041] For the battery provided by the present utility model, by forming the relief portion 205 at the position of the battery cell 2 corresponding to the corner portion 1021, it can, to a certain extent, avoid the corner portion 1021 of the cover plate assembly 1 squeezing the battery cell 2, causing the pole piece to shed powder and bringing potential safety hazards. Moreover, since the relief portion 205 in the present application is also provided with the liquid supplement assembly 3, on the one hand, the liquid supplement assembly 3 can separate the corner portion 1021 and the battery cell 2, so that the force exerted by the corner portion 1021 can be absorbed by the liquid supplement assembly 3. On the other hand, since the pressure on the liquid supplement assembly 3 continuously increases when the battery cell 2 generates gas and expands in the present application, the liquid supplement assembly 3 can ultimately be squeezed and broken, thereby releasing the internally contained electrolyte.

[0042] It can be understood that through the opening formed at one end of the housing 4, the battery cell 2 can be placed into the housing 4, and the housing 4 can provide a stable installation space for the battery cell 2. Correspondingly, by sealing the opening with the cover plate assembly 1, a closed installation space can be formed to accommodate the battery cell 2 and the electrolyte.

[0043] Optionally, as Figure 7 shown in combination with Figure 8 the liquid supplement assembly 3 in the present application includes a liquid supplement chamber 301 and an outer shell 302. The electrolyte is contained in the liquid supplement chamber 301. The liquid supplement chamber 301 is disposed inside the outer shell 302, and a perforation 3023 is formed at the bottom of the outer shell 302 for the entry of gas and the outflow of the electrolyte.

[0044] By providing the outer shell 302, a stable accommodation space can be provided for the liquid replenishment chamber 301. Since a perforation 3023 is formed at the bottom of the outer shell 302 in this application, gas can enter the accommodation space of the outer shell 302. It can be understood that since the volume of the outer shell 302 in this application does not change, when gas gradually enters the outer shell 302, the accommodation space can be compressed, thereby applying pressure to the liquid replenishment chamber 301 until the liquid replenishment chamber 301 ruptures.

[0045] When the liquid replenishment chamber 301 ruptures, the internal electrolyte flows out and can flow into the housing 4 through the perforation 3023 at the bottom, replenishing the electrolyte in the housing 4, improving and supplementing the overall performance of the battery, and ensuring the service life of the battery.

[0046] Optionally, as Figure 8 shown, a notch portion 3011 is formed on one side of the liquid replenishment chamber 301 in this application facing the perforation 3023, and the thickness of the notch portion 3011 is less than the thickness of other positions of the liquid replenishment chamber 301.

[0047] By forming the notch portion 3011 on one side of the liquid replenishment chamber 301 facing the perforation 3023, and the thickness of the notch portion 3011 is less than the thickness of other positions of the liquid replenishment chamber 301, the liquid replenishment chamber 301 can be more easily ruptured in this area. When gas enters the outer shell 302, the position of the notch portion 3011 can be gradually broken through, realizing the outflow of the electrolyte.

[0048] It should be supplemented here that the notch portion 3011 in this application is formed by connecting two Y-shaped notches, so that the middle position of the liquid replenishment chamber 301 can be made weaker, achieving the purpose of the gas bursting the liquid replenishment chamber 301. However, only one implementation mode is shown in this application, and other forms such as wavy, serrated and other forms of notch portions 3011 can also be adopted as long as they can be burst by gas. Figure 8 shown in the figure, only one implementation mode is shown in this application, and other forms such as wavy, serrated and other forms of notch portions 3011 can also be adopted as long as they can be burst by gas.

[0049] Optionally, as Figure 3 Combined with Figure 7 and Figure 8 shown, the outer shell 302 in this application includes a main body 3021 and an upper cover 3022. The perforation 3023 is formed at the bottom of the main body 3021. An opening is formed at the top of the main body 3021, and the upper cover 3022 seals the opening; a puncture portion 1022 is formed at the corner portion 1021, and a through hole 3024 is formed at the position of the upper cover 3022 corresponding to the puncture portion 1022. When the battery cell 2 generates gas and expands, the puncture portion 1022 can pass through the through hole 3024 to pierce the upper cover 3022 and puncture the liquid replenishment chamber 301.

[0050] In this application, the outer shell 302 is made into a split structure, that is, it is composed of a main body 3021 and an upper cover 3022, so that during the assembly stage, the liquid filling chamber 301 can smoothly enter the main body 3021 and be capped by the upper cover 3022 to protect the liquid filling chamber 301.

[0051] By forming a puncture part 1022 on the corner part 1021 and forming a through hole 3024 at the position of the upper cover 3022 corresponding to the puncture part 1022, a part of the puncture part 1022 can enter the through hole 3024 and have a certain gap with the liquid filling chamber 301.

[0052] When the battery cell 2 generates gas and expands, the gas in the battery cell 2 will compress the liquid filling chamber 301 in the main body 3021, making the liquid filling chamber 301 fit more closely with the upper cover 3022 and partially enter the through hole 3024, so that it can be punctured by the puncture part 1022 to realize the replenishment of the electrolyte.

[0053] Optionally, as Figures 4 - 6 shown, the battery cell 2 in this application includes a positive electrode plate 201, a negative electrode plate 202 and a separator 203. Cutting parts 204 are formed on the positive electrode plate 201, the negative electrode plate 202 and the separator 203. After the positive electrode plate 201, the negative electrode plate 202 and the separator 203 are wound to form the battery cell 2, the cutting parts 204 are wound to form an avoidance part 205.

[0054] It can be understood that the cutting parts 204 on the positive electrode plate 201, the negative electrode plate 202 and the separator 203 in this application are all multiple and are arranged at intervals, so that after winding to form the battery cell 2, the above-mentioned avoidance part 205 is formed at the edge of the battery cell 2.

[0055] Preferably, the length of the cutting part 204 in this application is a, and the length of the corner part 1021 is c, and a≥2c.

[0056] Since the length of the cutting part 204 in this application is larger than the length of the corner part 1021, it is possible to avoid the corner part 1021 applying pressure to the formed battery cell 2 in the length direction and causing the problem of powder falling off of the battery cell 2.

[0057] Correspondingly, the height of the cutting part 204 in this application is b, and the height of the corner part 1021 is d, and b>d, that is, the height of the cutting part 204 is greater than the height of the corner part 1021, so that on the basis of accommodating the liquid filling assembly 3, the corner part 1021 can be further accommodated, and the corner part 1021 and the liquid filling assembly 3 can be stably installed in alignment.

[0058] Optionally, as Figure 1 Combined with Figure 2As shown, the cover assembly 1 in the present application includes a cover body 101 and a lower plastic 102. The lower plastic 102 is located between the battery cell 2 and the cover body 101, and the lower plastic 102 is connected to the cover body 101; corner portions 1021 are formed at both ends of the lower plastic 102.

[0059] The cover body 101 in the present application is adapted to the size of the housing 4, so as to be able to close the opening of the housing 4, while the size of the lower plastic 102 is smaller than the size of the cover body 101, so that when the cover body 101 and the housing 4 are correspondingly installed, it can be embedded in the housing 4. Correspondingly, through the corner portions 1021 formed at both ends of the lower plastic 102, on the one hand, the liquid supplementing assembly 3 can be limited, and on the other hand, a setting space can be provided for the above-mentioned puncturing portion 1022, so as to ensure that after the battery cell 2 generates gas and causes the liquid supplementing chamber 301 to expand, it is punctured by the puncturing portion 1022 to achieve the purpose of electrolyte supplement.

[0060] Preferably, as Figure 1 Combined Figure 2 As shown, the battery provided by the present utility model further includes a covering member 5. The covering member 5 covers the battery cell 2 and the liquid supplementing assembly 3, and restricts the liquid supplementing assembly 3 in the avoidance portion 205.

[0061] The size of the covering member 5 in the height direction in the present application is the same as the size of the battery cell 2 in the height direction, so as to be able to cooperate with the avoidance portion 205 formed by the battery cell 2 to accommodate and limit the liquid supplementing assembly 3, and avoid the problem of the liquid supplementing assembly 3 moving around.

[0062] In addition, the present utility model further provides an electrical device applying the above battery.

[0063] The electrical device using the battery provided by the present application can have a more stable and safe use process. At the same time, after long-term use, the electrolyte in the liquid supplementing assembly 3 can be obtained, and certain performance can be restored, improving the service life of the battery.

[0064] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery, characterized in that: It comprises a cover plate assembly (1), a battery cell (2) and a shell (4); An opening is formed at one end of the shell (4), the battery cell (2) is arranged in the shell (4), and the cover plate assembly (1) is sealed at the opening; The cover plate assembly (1) has protruding corner portions (1021) formed at both ends of a side facing the battery core (2); The battery core (2) faces one end of the cover plate assembly (1), and a relief portion (205) is formed corresponding to the position of the corner portion (1021); the relief portion (205) is provided with a liquid replenishing assembly (3), and the liquid replenishing assembly (3) contains electrolyte; When the battery core (2) generates gas and expands, the liquid replenishing component (3) disposed between the corner portion (1021) and the avoidance portion (205) is pressurized and releases electrolyte.

2. The battery according to claim 1, characterized in that The liquid replenishing component (3) comprises a liquid replenishing chamber (301) and an outer shell (302), the electrolyte is contained in the liquid replenishing chamber (301), the liquid replenishing chamber (301) is arranged in the outer shell (302), and a perforation (3023) is formed at the bottom of the outer shell (302) for gas to enter and electrolyte to flow out.

3. The battery according to claim 2, characterized in that A notched portion (3011) is formed on one side of the liquid replenishing chamber (301) facing the through hole (3023), and the thickness of the notched portion (3011) is smaller than the thickness of other positions of the liquid replenishing chamber (301).

4. The battery according to claim 2, characterized in that The housing (302) comprises a main body (3021) and an upper cover (3022), the through hole (3023) is formed at the bottom of the main body (3021), an opening is formed at the top of the main body (3021), and the upper cover (3022) covers the opening; The corner portion (1021) is formed with a puncture portion (1022), and the upper cover (3022) is formed with a through hole (3024) at a position corresponding to the puncture portion (1022). When the battery cell produces gas and expands, the puncture portion (1022) can pass through the upper cover (3022) through the through hole (3024) to puncture the liquid replenishing chamber (301).

5. The battery according to claim 1, characterized in that The battery cell (2) comprises a positive electrode sheet (201), a negative electrode sheet (202) and a separator (203); a cut-out portion (204) is formed on each of the positive electrode sheet (201), the negative electrode sheet (202) and the separator (203); after the positive electrode sheet (201), the negative electrode sheet (202) and the separator (203) are wound to form the battery cell (2), the cut-out portion (204) is wound to form the avoidance portion (205).

6. The battery according to claim 5, characterized in that The length of the cut-off portion (204) is a, the length of the corner portion (1021) is c, and a≥2c.

7. The battery according to claim 5, characterized in that The height of the cut-off portion (204) is b, and the height of the corner portion (1021) is d, and b>d.

8. The battery according to claim 1, characterized in that The cover plate assembly (1) comprises a cover plate body (101) and a lower plastic (102), wherein the lower plastic (102) is located between the battery cell (2) and the cover plate body (101), and the lower plastic (102) is connected to the cover plate body (101); The corner portions (1021) are formed at two ends of the lower plastic (102).

9. The battery according to claim 1, characterized in that It also comprises a covering member (5), wherein the covering member (5) covers the battery core (2) and the liquid replenishing assembly (3), and restricts the liquid replenishing assembly (3) within the avoidance portion (205).

10. An electrical device, characterized in that: The electrical device comprises the battery according to any one of claims 1-9.

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