Battery cell and battery pack

Abstract

The utility model discloses a single battery and a battery pack, and belongs to the technical field of batteries. The pole column is arranged on the battery shell; the anti-explosion valve is arranged on the battery shell; the insulation sleeve comprises a thermal shrinkage insulation body and a bonding layer, the thermal shrinkage insulation body covers the outer side of the battery shell, the bonding layer is arranged between the thermal shrinkage insulation body and the battery shell and is used for bonding the thermal shrinkage insulation body and the battery shell, and the thermal shrinkage insulation body is provided with an explosion-proof hole corresponding to the explosion-proof valve; and the thermal shrinkage insulation body is provided with a pole hole for the pole to penetrate out. The battery shell insulation protection structure is simplified, and the external insulation reliability of the battery shell is improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and specifically relates to a battery cell and a battery pack. Background Technology

[0002] Currently, most battery casing insulation methods combine insulating films and insulating patches. Insulation is achieved by wrapping insulating film around the battery's main surface and sides, and attaching insulating patches to the battery's end faces, such as the cover surface and the bottom wall of the casing. However, the wrapped insulating film needs to be bent and overlapped at the corners of the casing and in the areas where it intersects with the insulating patches. With prolonged battery use, both the insulating film and the insulating patches are prone to peeling, affecting the insulation performance of the battery casing. Utility Model Content

[0003] Purpose of this application: This application provides a single battery cell to overcome the above-mentioned technical problems; another purpose of this application is to provide a battery pack using the above-mentioned single battery cell.

[0004] Technical solution: A battery cell according to an embodiment of this application includes:

[0005] Battery casing;

[0006] Terminal posts are disposed on the battery casing;

[0007] An explosion-proof valve is located on the battery casing;

[0008] An insulating sleeve, comprising a heat-shrinkable insulating body and an adhesive layer, wherein the heat-shrinkable insulating body covers the outer side of the battery casing, and the adhesive layer is disposed between the heat-shrinkable insulating body and the battery casing and bonds the heat-shrinkable insulating body and the battery casing, wherein the heat-shrinkable insulating body has an explosion-proof hole corresponding to the explosion-proof valve, and wherein the heat-shrinkable insulating body has an electrode hole for the electrode post to pass through.

[0009] In some embodiments, the battery casing has a peripheral wall, a first end wall connected to one end of the peripheral wall, and a second end wall connected to the other end of the peripheral wall, wherein at least one of the first end wall and the second end wall is provided with the electrode post, and the explosion-proof valve is disposed on one of the peripheral wall, the first end wall and the second end wall.

[0010] In some embodiments, the heat-shrinkable insulating body includes a first state and a second state. In the first state, the heat-shrinkable insulating body has an inlet for the battery casing to be inserted. In the second state, the side of the heat-shrinkable insulating body with the inlet is configured to be heat-fused and cover the battery casing.

[0011] In some embodiments, the inlet and the pole hole are located on different sides of the heat-shrinkable insulating body;

[0012] Furthermore, the inlet and the explosion-proof hole are located on different sides of the heat-shrinkable insulation body.

[0013] In some embodiments, the heat-shrinkable insulating body includes an integrally formed periphery, a first end, and a second end, wherein the periphery covers the periphery wall, the first end covers the first end wall, and the second end covers the second end wall;

[0014] The inlet is located at the second end, and at least one of the pole hole and the explosion-proof hole is located at the first end.

[0015] In some embodiments, the battery housing includes a housing and a cover disposed on the housing, the peripheral wall and the second end wall are located on the housing, the first end wall is located on the cover, and the terminal post and the explosion-proof valve are respectively disposed on the cover.

[0016] In some embodiments, the thickness of the insulating sleeve is less than the height at which the terminal protrudes from the outside of the battery casing.

[0017] In some embodiments, the heat-shrinkable insulating body is made of ethylene-vinyl acetate copolymer, polyethylene, polyvinylidene fluoride, polytetrafluoroethylene, ethylene propylene rubber, fluoroethylene propylene copolymer, or silicone rubber.

[0018] In some embodiments, the adhesive layer is configured as a hot melt pressure-sensitive adhesive.

[0019] Accordingly, an embodiment of this application provides a battery pack including the aforementioned battery cells.

[0020] Beneficial Effects: The battery cell in this embodiment includes a battery casing, terminals, an explosion-proof valve, and an insulating sleeve. The terminals are located on the battery casing; the explosion-proof valve is located on the battery casing; the insulating sleeve includes a heat-shrinkable insulating body and an adhesive layer. The heat-shrinkable insulating body covers the outside of the battery casing, and the adhesive layer is located between the heat-shrinkable insulating body and the battery casing, bonding them together. The heat-shrinkable insulating body has an explosion-proof hole corresponding to the explosion-proof valve, and also has a terminal hole for the terminals to pass through. By integrating the heat-shrinkable insulating body onto the outside of the battery casing, the insulation protection structure of the battery casing is simplified. The heat-shrinkable effect of the insulating body improves the fit between the insulating body and the battery casing, enhancing the stability of the insulation protection. Furthermore, by adding an adhesive layer between the battery casing and the heat-shrinkable insulating body, the connection stability between the insulating body and the battery casing is further improved, enhancing the external insulation reliability of the battery casing. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a battery cell covered with an insulating sleeve, provided in an embodiment of this application.

[0023] Figure 2 This is a schematic diagram of the structure of a single battery cell from the front, as shown in an embodiment of this application.

[0024] Figure 3 for Figure 2 A sectional view along line AA.

[0025] Figure 4 This is a schematic diagram of the structure of the insulating sleeve provided in an embodiment of this application;

[0026] Figure 5 for Figure 3 Enlarged view of section B;

[0027] Figure 6 A schematic diagram showing the state of a battery cell before it is inserted into the insulating sleeve, as provided in an embodiment of this application.

[0028] Reference numerals: 1. Battery casing; 10. Shell; 100. Peripheral wall; 101. Second end wall; 11. Cover; 110. First end wall; 2. Terminal post; 3. Explosion-proof valve; 4. Insulating sleeve; 40. Heat-shrinkable insulating body; 400. Peripheral part; 401. First end; 402. Second end; 41. Adhesive layer; 42. Explosion-proof hole; 43. Terminal post hole; 44. Inlet. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0030] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified.

[0031] Currently, most battery casing insulation methods combine insulating films and insulating patches. Insulation is achieved by wrapping insulating film around the battery's main surface and sides, and attaching insulating patches to the battery's end faces, such as the cover surface and the bottom wall of the casing. However, the wrapped insulating film needs to be bent and overlapped at the corners of the casing and in the areas where it intersects with the insulating patches. With prolonged battery use, both the insulating film and the insulating patches are prone to peeling, affecting the insulation performance of the battery casing.

[0032] In view of this, refer to Figures 1 to 6 This application provides a battery cell to overcome at least one of the above-mentioned technical problems.

[0033] Reference Figures 1 to 6 A single battery cell includes a battery casing 1, a terminal post 2, an explosion-proof valve 3, and an insulating sleeve 4.

[0034] The terminal post 2 is located on the battery casing 1, and the explosion-proof valve 3 is located on the battery casing 1. The insulating sleeve 4 includes a heat-shrinkable insulating body 40 and an adhesive layer 41. The heat-shrinkable insulating body 40 covers the outside of the battery casing 1, and the adhesive layer 41 is located between the heat-shrinkable insulating body 40 and the battery casing 1 and bonds the heat-shrinkable insulating body 40 and the battery casing 1. The heat-shrinkable insulating body 40 has an explosion-proof hole 42 corresponding to the explosion-proof valve 3, and the heat-shrinkable insulating body 40 has a terminal post hole 43 for the terminal post 2 to pass through.

[0035] By covering the outside of the battery casing 1 with an integrated heat-shrinkable insulating body 40, the insulation protection structure of the battery casing 1 is simplified. Relying on the heat-shrinkable effect of the heat-shrinkable insulating body 40, the bonding effect between the heat-shrinkable insulating body 40 and the battery casing 1 is improved, thereby enhancing the stability of the insulation protection. In addition, by adding an adhesive layer 41 between the battery casing 1 and the heat-shrinkable insulating body 40, the connection stability between the heat-shrinkable insulating body 40 and the battery casing 1 is further improved, thereby enhancing the external insulation reliability of the battery casing 1.

[0036] In some embodiments, refer to Figures 3 to 5The battery casing 1 has a peripheral wall 100, a first end wall 110 connected to one end of the peripheral wall 100, and a second end wall 101 connected to the other end of the peripheral wall 100. At least one of the first end wall 110 and the second end wall 101 has a terminal post 2 inserted through it. An explosion-proof valve 3 is disposed on one of the peripheral wall 100, the first end wall 110, and the second end wall 101. It is understood that the above-mentioned battery cell can be of the type in which multiple terminals 2 are located on the same side or multiple terminals 2 are located on opposite sides. In addition, the explosion-proof valve 3 can be located on the same side as the terminal post 2 or distributed on opposite sides of the terminal post 2 to achieve thermoelectric separation.

[0037] In some embodiments, refer to Figures 3 to 6 The heat-shrinkable insulating body 40 includes a first state and a second state. In the first state, refer to... Figure 6 The heat-shrinkable insulating body 40 has an inlet 44 for inserting the battery casing 1. In the second state, refer to Figure 3 and Figure 4 The side of the heat-shrinkable insulating body 40 with the inlet 44 is configured to be heat-fused and cover the battery casing 1. The inlet 44 is closed by heat-fused heat-shrinkable insulating body 40, which helps to form an integral seamless insulating sleeve 4 and improves the reliability of the external insulation of the battery casing 1.

[0038] In some embodiments, refer to Figure 4 and Figure 6 The inlet 44 and the pole hole 43 are located on different sides of the heat-shrinkable insulation body 40. Furthermore, the inlet 44 and the explosion-proof hole 42 are located on different sides of the heat-shrinkable insulation body 40.

[0039] In some embodiments, refer to Figure 4 and Figure 6 The heat-shrinkable insulating body 40 includes an integrally formed peripheral portion 400, a first end portion 401, and a second end portion 402. The peripheral portion 400 covers the peripheral wall 100, the first end portion 401 covers the first end wall 110, and the second end portion 402 covers the second end wall 101. An inlet 44 is provided at the second end portion 402, and at least one of the pole hole 43 and the explosion-proof hole 42 is provided at the first end portion 401.

[0040] In some embodiments, refer to Figures 1 to 4 The battery casing 1 includes a casing 10 and a cover 11 covering the casing 10. A peripheral wall 100 and a second end wall 101 are located on the casing 10, and a first end wall 110 is located on the cover 11. The pole post 2 and the explosion-proof valve 3 are respectively located on the cover 11.

[0041] Specifically, in this embodiment, the explosion-proof hole 42 and the terminal hole 43 are located on the same side. The explosion-proof hole 42 and the terminal hole 43 can be pre-set in the heat-shrinkable insulating body 40, and the inlet 44, the terminal hole 43, and the explosion-proof hole 42 are arranged opposite to each other. Before the battery casing 1 is inserted into the heat-shrinkable insulating body 40, the inlet 44 can be inflated by a fan to facilitate the rapid insertion of the battery casing 1. The explosion-proof hole 42 and the terminal hole 43 are located on the same side, which facilitates the rapid alignment and positioning of the battery casing 1 and improves the convenience of inserting the battery casing 1 into the insulating sleeve. After the battery casing 1 is placed into the insulating sleeve 4, it is heated and the insulating sleeve 4 is shrunk and attached to the battery casing 1. Then, one side of the inlet 44 is heated and pressed flat, thus forming the second end 402 covering the second end wall 101, thereby forming an integral seamless insulating sleeve 4. In addition, in other embodiments, the explosion-proof hole 42 and the terminal hole 43 can also be located on different sides, which will not be described in detail here.

[0042] In some embodiments, refer to Figure 3 The thickness of the insulating sleeve 4 is less than the height of the terminal post 2 protruding from the outer side of the battery casing 1. This helps to reserve a contact surface for electrical connection of the terminal post 2 and avoids the insulating sleeve 4 covering the terminal post 2 in the thickness direction and excessively occupying the electrical connection surface of the terminal post 2.

[0043] In some embodiments, the heat-shrinkable insulating body 40 is made of one of the following materials: ethylene-vinyl acetate copolymer, polyethylene, polyvinylidene fluoride, polytetrafluoroethylene, ethylene propylene rubber, fluoroethylene propylene copolymer, and silicone rubber. This helps ensure that the heat-shrinkable insulating body 40 provides good insulation performance and heat-shrinkability, thereby improving the reliability of the external insulation of the battery casing 1.

[0044] In some embodiments, refer to Figure 5 The adhesive layer 41 is set as a hot melt pressure-sensitive adhesive. During the heating of the heat-shrinkable insulating body 40, the heat-shrinkable insulating body 40 can shrink and adhere to the battery shell 1. At the same time, the adhesive layer 41, which is set as a hot melt pressure-sensitive adhesive, can generate adhesion when heated and stably bond the heat-shrinkable insulating body 40 and the battery shell 1 after cooling, thereby improving the external insulation reliability of the battery shell 1.

[0045] Accordingly, the battery pack provided in this application embodiment is used for storing and releasing electrical energy. The battery pack can have all the technical features and effects of the aforementioned battery cells, which will not be repeated here. The battery pack can be a charging and discharging structure composed of multiple battery cells, such as a battery module, battery pack, battery cluster, battery stack, battery tower, or battery array. Battery cells include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments disclosed herein do not limit them.

[0046] The present application provides a detailed description of a battery cell and battery pack, and uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of the present application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized by, The battery cell comprises: a battery shell (1); a pole column (2) arranged in the battery shell (1); an explosion-proof valve (3) arranged in the battery shell (1); an insulating sleeve (4) comprising a heat-shrinkable insulating body (40) and an adhesive layer (41), the heat-shrinkable insulating body (40) being wrapped on the outside of the battery shell (1), the adhesive layer (41) being arranged between the heat-shrinkable insulating body (40) and the battery shell (1) and bonding the heat-shrinkable insulating body (40) and the battery shell (1), the heat-shrinkable insulating body (40) being provided with an explosion-proof hole (42) corresponding to the explosion-proof valve (3), and the heat-shrinkable insulating body (40) being provided with a pole column hole (43) for the pole column (2) to pass out.

2. The battery cell according to claim 1, wherein the battery shell (1) has a peripheral wall (100), a first end wall (110) connected to one end of the peripheral wall (100), and a second end wall (101) connected to the other end of the peripheral wall (100), at least one of the first end wall (110) and the second end wall (101) being provided with the pole column (2), and the explosion-proof valve (3) being arranged in one of the peripheral wall (100), the first end wall (110), and the second end wall (101).

3. The battery cell according to claim 2, wherein the heat-shrinkable insulating body (40) comprises a first state and a second state, in the first state, the heat-shrinkable insulating body (40) is provided with a guide inlet (44) for guiding the battery shell (1) to enter, and in the second state, one side of the heat-shrinkable insulating body (40) provided with the guide inlet (44) is configured to be hot-melted and wrapped around the battery shell (1).

4. The battery cell according to claim 3, wherein the guide inlet (44) and the pole column hole (43) are respectively located on different sides of the heat-shrinkable insulating body (40); and the guide inlet (44) and the explosion-proof hole (42) are respectively located on different sides of the heat-shrinkable insulating body (40).

5. The battery cell according to claim 4, wherein the heat-shrinkable insulating body (40) comprises a peripheral portion (400), a first end portion (401), and a second end portion (402) arranged integrally, the peripheral portion (400) wrapping the peripheral wall (100), the first end portion (401) wrapping the first end wall (110), and the second end portion (402) wrapping the second end wall (101); and the guide inlet (44) is arranged in the second end portion (402), and at least one of the pole column hole (43) and the explosion-proof hole (42) is arranged in the first end portion (401).

6. The battery cell according to claim 5, wherein The battery shell (1) comprises a shell (10) and a cover (11) arranged on the shell (10), the peripheral wall (100) and the second end wall (101) are arranged on the shell (10), the first end wall (110) is arranged on the cover (11), and the pole (2) and the explosion-proof valve (3) are arranged on the cover (11) respectively. 7.The battery cell of claim 1, wherein a thickness of the insulating sleeve (4) is less than a height of the pole (2) protruding out of the battery shell (1). 8.The battery cell of any one of claims 1 to 7, wherein a material of the heat-shrinkable insulating body (40) is ethylene-vinyl acetate copolymer, polyethylene, polyvinylidene fluoride, polytetrafluoroethylene, ethylene-propylene rubber, fluorinated ethylene-propylene copolymer, or silicone rubber. 9.The battery cell of any one of claims 1 to 7, wherein the adhesive layer (41) is a hot-melt pressure-sensitive adhesive. A battery cell as claimed in any one of claims 1 to 9. ​ ​ 10. A battery pack characterized by comprising: ​

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