Battery shell with integrated structure and battery

Abstract

The embodiment of the utility model discloses a battery shell with an integrated structure and a battery, and relates to the technical field of batteries and energy storage. The battery shell of the integrated structure comprises a body and an exhaust assembly, a liquid injection hole is formed in the body, the exhaust assembly comprises an elastic part and a valve element, the elastic part is arranged on the body and presses the valve element into the liquid injection hole so that the valve element can seal the liquid injection hole, and the valve element moves along the liquid injection hole when the pressure in the body is larger than a preset value. When the elastic piece is in the initial state, the elastic piece can keep the valve element in the liquid injection hole, and when the pressure in the body is larger than a preset value, the pressure in the body can drive the valve element to offset the friction force between the valve element and the body so as to move relative to the liquid injection hole. The valve element drives the elastic piece to generate elastic deformation, the exhaust gap is generated between the valve element and the body in the moving process, and internal gas is exhausted from the exhaust gap to prevent deformation and expansion of the body.

Description

Technical Field

[0001] This utility model relates to the field of battery and energy storage technology, and in particular to a battery casing and battery with an integrated structure. Background Technology

[0002] During battery cell use, gas is continuously generated inside the cell casing. Because the cell is in a completely sealed state, the internal gas pressure will continuously increase until the explosion-proof valve opens. During this period (before the explosion-proof valve opens), the cell casing bulges due to the internal gas pressure being greater than the external gas pressure, causing the electrolyte level to drop. This results in the upper electrode of the bare cell not being properly wetted, and the bottom and side walls of the cell deform, leading to reduced heat transfer. The top cover bulges and deforms, causing poor sealing at the electrode mounting position. Utility Model Content

[0003] Based on this, it is necessary to provide a battery casing and battery with an integrated structure, which aims to solve the problems of the cell casing bulging due to the internal air pressure being greater than the external air pressure, the electrolyte level dropping, resulting in poor wetting of the upper electrode of the bare cell, deformation of the bottom and side walls of the cell, resulting in reduced heat transfer of the cell, and bulging and deformation of the top cover, resulting in poor sealing of the terminal mounting position.

[0004] In a first aspect, this utility model provides a battery casing with an integrated structure, comprising: a body and an venting assembly. The body is provided with a liquid injection hole, and the venting assembly includes an elastic element and a valve core. The elastic element is disposed on the body and presses the valve core into the liquid injection hole so that the valve core seals the liquid injection hole. The valve core is configured such that when the pressure in the body is greater than a preset value, the valve core moves along the liquid injection hole to create an venting gap between the body and the valve core, and drives the elastic element to undergo elastic deformation.

[0005] In one embodiment, the elastic element includes a connecting portion and an abutting portion, the connecting portion being connected between the body and the abutting portion, and the abutting portion abutting against the valve core.

[0006] In one embodiment, the venting assembly further includes a seal, the valve core has a through hole for liquid injection, and the seal covers the through hole.

[0007] In one embodiment, the abutment portion is provided with a circular hole for avoiding the seal.

[0008] In one embodiment, the outer periphery of the valve core is provided with at least one mounting groove, and each mounting groove is provided with a sealing ring, which is clamped between the body and the valve core.

[0009] In one embodiment, the injection hole gradually narrows from the outside of the body to the inside of the body.

[0010] In one embodiment, the venting assembly further includes a sealing gasket, the injection port includes a first port and a second port communicating with the first port, the valve core is disposed in the first port, and the sealing gasket is disposed in the second port.

[0011] In one embodiment, the diameter of the first hole is larger than the diameter of the second hole to form a step on the wall of the injection hole, the first hole gradually narrows from the outside of the body to the inside of the body, and the second hole gradually narrows from the outside of the body to the inside of the body.

[0012] The valve core includes a core body and a first insertion portion connected to the core body. The sealing gasket is provided with a second insertion portion. The first insertion portion and the second insertion portion cooperate with each other. The core body cooperates with the step.

[0013] In one embodiment, the valve core further includes a protrusion connected to the core body, and the elastic element has a circular hole in the middle, through which the elastic element is sleeved on the protrusion.

[0014] In one embodiment, the body is provided with multiple slots, and the circumferential outer side of the elastic element is engaged in the slots to press the valve core into the injection hole.

[0015] In one embodiment, the body includes a top cover and a housing module connected to the top cover, with the injection port located on the top cover.

[0016] Secondly, this utility model also provides a battery, which includes a battery cell and a battery casing with an integral structure of any of the above embodiments, wherein the battery cell is installed in the casing.

[0017] Implementing the embodiments of this utility model will have the following beneficial effects:

[0018] This invention relates to an integrated battery casing and battery. The integrated battery casing has a liquid injection hole in its main body. An elastic element is disposed in the main body and presses a valve core into the liquid injection hole to seal it. The valve core is configured to move along the liquid injection hole when the pressure inside the main body exceeds a preset value, creating an exhaust gap between the main body and the valve core. This exhaust gap drives the elastic element to undergo elastic deformation. Initially, the elastic element holds the valve core within the liquid injection hole. When the pressure inside the main body exceeds the preset value, the internal air pressure drives the valve core to counteract the friction between the valve core and the main body, causing it to move relative to the liquid injection hole. The valve core causes the elastic element to undergo elastic deformation, creating an exhaust gap during its movement. Internal gas is discharged through this gap to prevent deformation and expansion of the main body. When the pressure inside the main body is less than or equal to the preset value, the valve core is re-pressed into the liquid injection hole under the drive of the elastic element, sealing the hole. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] in:

[0021] Figure 1 This is an isometric view of a battery casing with an integral structure in one embodiment.

[0022] Figure 2 for Figure 1 Side view of the unibody battery casing shown.

[0023] Figure 3 for Figure 2 A cross-sectional view along direction AA in the integrated battery casing shown.

[0024] Figure 4 for Figure 3 A partially enlarged schematic diagram of part B in the integrated battery casing shown.

[0025] Figure 5 This is an isometric view of a battery casing with an integral structure in one embodiment.

[0026] Figure 6 for Figure 5 Side view of the unibody battery casing shown.

[0027] Figure 7 for Figure 6 A cross-sectional view along the CC direction of the integrated battery casing shown.

[0028] Figure 8 for Figure 7 A partially enlarged schematic diagram of part D in the integrated battery casing shown.

[0029] Figure label:

[0030] 1. Body; 11. Injection hole; 111. First hole; 112. Second hole; 113. Step; 12. Slot;

[0031] 2. Exhaust assembly; 21. Elastic element; 211. Connecting part; 212. Abutting part; 213. Round hole; 22. Valve core; 221. Through hole; 222. Mounting groove; 223. Core body; 224. First insertion part; 225. Protrusion; 23. Sealing element; 24. Sealing ring; 25. Sealing gasket; 251. Second insertion part. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0036] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0037] Please combine them together Figures 1 to 8 The integrated battery casing provided by this utility model will now be described. The integrated battery casing is used in a battery.

[0038] The integrated battery casing includes a body 1 and a venting assembly 2. The body 1 has an injection port 11. The venting assembly 2 includes an elastic element 21 and a valve core 22. The elastic element 21 is disposed on the body 1 and presses the valve core 22 into the injection port 11 to seal the injection port 11. The valve core 22 is configured such that when the pressure inside the body 1 exceeds a preset value, the valve core 22 moves along the injection port 11, creating a venting gap between the body 1 and the valve core 22, and driving the elastic element 21 to undergo elastic deformation. Specifically, the elastic element 21 is an elastic sheet.

[0039] It is understood that the main body 1 of the integrated battery casing is provided with a liquid injection hole 11, and the elastic element 21 is disposed on the main body 1, pressing the valve core 22 into the liquid injection hole 11 so that the valve core 22 seals the liquid injection hole 11. The valve core 22 is configured to move along the liquid injection hole 11 when the pressure inside the main body 1 is greater than a preset value, so that an exhaust gap is generated between the main body 1 and the valve core 22, and the elastic element 21 is driven to undergo elastic deformation. In the initial state, the elastic element 21 can hold the valve core 22 in the liquid injection hole 11. When the pressure inside the main body 1 is greater than the preset value, the internal air pressure will drive the valve core 22 to counteract the friction between the valve core 22 and the main body 1 and move relative to the liquid injection hole 11. The valve core 22 drives the elastic element 21 to undergo elastic deformation. During the movement of the valve core 22, an exhaust gap is generated between it and the main body 1, and the internal gas is discharged from the exhaust gap to prevent the deformation and expansion of the main body 1. When the pressure inside the body 1 is less than or equal to the preset value, the valve core 22 is re-pressed into the injection hole 11 under the drive of the elastic element 21, sealing the injection hole 11.

[0040] It should be noted that the main body 1 includes a top cover and a housing module connected to the main body 1. The top cover and the housing module are welded to form a closed space, and the battery cell is installed in the closed space. The liquid injection hole 11 is located on the top cover.

[0041] In one embodiment of a one-piece battery casing:

[0042] like Figures 1 to 4 As shown, the injection hole 11 gradually narrows from the outside to the inside of the body 1. Specifically, the injection hole 11 is conical, and the valve core 22, which conforms to the shape of the injection hole 11, is also conical. This facilitates the installation guidance of the valve core 22, allowing it to be smoothly assembled into the injection hole 11 and preventing it from falling into the integrated battery casing. Due to the fit between the conical surfaces, as the valve core 22 moves relative to the body 1, the venting gap between the valve core 22 and the body 1 gradually increases to achieve venting. Furthermore, it allows for positioning of the compression amount after the sealing ring 24 is installed, as well as positioning of the valve core 22 to seal the injection hole 11.

[0043] Of course, in other embodiments, the injection hole 11 is a frustum of a pyramid, and the valve core 22, which conforms to the shape of the injection hole 11, is also a frustum of a pyramid. This facilitates the installation guidance of the valve core 22, allowing it to be smoothly assembled into the injection hole 11 and preventing it from falling into the integrated battery casing. Furthermore, due to the mating of the pyramidal surfaces, as the valve core 22 moves relative to the body 1, the venting gap between the valve core 22 and the body 1 gradually increases, thus achieving venting.

[0044] In this embodiment, the elastic element 21 includes a connecting portion 211 and an abutting portion 212. The connecting portion 211 is connected between the body 1 and the abutting portion 212, and the abutting portion 212 abuts against the valve core 22. Specifically, the connecting portion 211 and the abutting portion 212 are integrally formed, and the connecting portion 211 is welded to the body 1. When the gas pressure inside the body 1 is greater than a preset value, the valve core 22 moves relative to the body 1. The valve core 22 drives the abutting portion 212 to move, and the abutting portion 212 causes the connecting portion 211 to undergo elastic deformation, resulting in an exhaust gap between the valve core 22 and the body 1. When the pressure inside the body 1 decreases, the elastic deformation force of the connecting portion 211 drives the abutting portion 212 to reset, and the abutting portion 212 abuts against the valve core 22 to reset, thereby sealing the injection hole 11. The connecting portion 211 can be annular and located on the circumferential outer side of the abutting portion 212, or it can be multiple strips located on the circumferential outer side of the abutting portion 212.

[0045] Furthermore, the abutment portion 212 is circular or annular and fits against the upper end of the valve core 22. This ensures that the valve core 22 is pressed evenly, preventing axial movement and tilting, and allowing for smooth venting. In addition, the abutment portion 212 provides compression force to the sealing ring 24, enabling the sealing ring 24 to further seal the injection hole 11.

[0046] Furthermore, the venting assembly 2 also includes a seal 23. The valve core 22 has a through hole 221 for liquid injection, and the seal 23 covers the through hole 221. Specifically, the seal 23 is a hole cap or a sealing pin. Electrolyte is injected into the body 1 through the through hole 221, enabling the electrode to be wetted. After the electrolyte is injected, the seal 23 is welded to the valve core 22 and used to seal the through hole 221. Because venting and liquid injection are achieved in the injection hole 11, the number of machining holes in the body 1 can be reduced, production costs can be lowered, and the space utilization of the body 1 can be improved.

[0047] Furthermore, the abutment portion 212 is provided with a circular hole 213, which is used to avoid the sealing element 23. In this way, after the valve core 22 and the elastic element 21 are assembled, electrolyte is added into the body 1 through the through hole 221. The circular hole 213 can avoid the through hole 221, allowing the electrolyte to be added. Then, the sealing element 23 seals the through hole 221, avoiding interference between the abutment portion 212 and the sealing element 23.

[0048] Furthermore, the outer periphery of the valve core 22 is provided with at least one mounting groove 222, and each mounting groove 222 is provided with a sealing ring 24, which is clamped between the body 1 and the valve core 22. Specifically, the sealing ring 24 is a structural component made of elastic sealing material. The sealing ring 24 can be circular, rhomboid, or triangular. The mounting groove 222 can be circular or trapezoidal. The sealing ring 24 can seal between the valve core 22 and the body 1 to close the injection hole 11. The sealing ring 24 moves with the valve core 22, creating an venting gap between the valve core 22 and the body 1.

[0049] Furthermore, the plane of the end of the valve core 22 furthest from the elastic element 21 is not flush with the plane of the inner wall of the body 1. This allows the sealing ring 24 and the sealing element 23 to have more installation positions and compression contact area, maintaining a good seal.

[0050] In another embodiment of the integrated battery casing:

[0051] like Figures 5 to 8 As shown, the venting assembly 2 also includes a sealing gasket 25. The injection port 11 includes a first hole 111 and a second hole 112 communicating with the first hole 111. The valve core 22 is disposed in the first hole 111, and the sealing gasket 25 is disposed in the second hole 112. The elastic member 21 can abut the valve core 22 in the first hole 111, and the valve core 22 abuts the sealing gasket 25 in the second hole 112 to achieve sealing of the injection port 11. When the gas pressure inside the body 1 is greater than a preset value, the sealing gasket 25 drives the valve core 22 to move relative to the body 1. The valve core 22 drives the elastic member 21 to undergo elastic deformation, so that an venting gap is generated between the sealing gasket 25 and the body 1, and between the valve core 22 and the body 1, to achieve venting.

[0052] In this embodiment, the diameter of the first hole 111 is larger than the diameter of the second hole 112, so as to form a step 113 on the wall of the injection hole 11. Specifically, a recessed step 113 is formed around the circumference of the first hole 111, and the wall of the step 113 is conical.

[0053] The valve core 22 includes a core body 223 and a first insertion portion 224 connected to the core body 223. The sealing gasket 25 has a second insertion portion 251. The first insertion portion 224 and the second insertion portion 251 cooperate with each other. The core body 223 cooperates with the step 113. The core body 223 is conical. The cooperation between the core body 223 and the step 113 positions the core body 223, ensuring uniform circumferential compression of the sealing gasket 25 and guiding the axial movement of the valve core 22. One of the first insertion portion 224 and the second insertion portion 251 is a protrusion, and the other is a groove. The cooperation between the first insertion portion 224 and the second insertion portion 251 completely seals the gap between the valve core 22 and the sealing gasket 25.

[0054] Furthermore, the first hole 111 gradually narrows from the outside to the inside of the body 1, and the second hole 112 also gradually narrows from the outside to the inside of the body 1. Specifically, both the first hole 111 and the second hole 112 are conical. The valve core 22, which conforms to the first hole 111, is conical, and the sealing gasket 25, which conforms to the second hole 112, is conical. This facilitates the installation guidance of the valve core 22, allowing it to be smoothly installed in the first hole 111 and preventing it from falling into the body 1. It also facilitates the installation guidance of the sealing gasket 25, allowing it to be smoothly installed in the second hole 112 and preventing it from falling into the body 1. Due to the contact between the conical surfaces, as the valve core 22 moves relative to the body 1, the venting gap between the valve core 22 and the body 1 gradually increases, as does the venting gap between the sealing gasket 25 and the body 1, thus achieving venting. In addition, it can locate the compression amount of the sealing gasket 25 after installation, as well as the positioning of the sealing first hole 111 of the valve core 22.

[0055] In practice, the second insertion part 251 is a groove, which can reduce the material of the sealing gasket 25 and reduce costs.

[0056] Furthermore, since air venting and liquid injection are achieved in the injection hole 11, the body 1 can reduce the number of machining holes, reduce production costs, and improve the space utilization of the body 1.

[0057] Furthermore, the valve core 22 also includes a protrusion 225 connected to the core body 223, and the elastic element 21 has a circular hole 213 in the middle, through which the elastic element 21 is fitted onto the protrusion 225. By providing the circular hole 213, the elastic element 21 can directly abut against the core body 223, thereby enabling the core body 223 to better seal the first hole 111.

[0058] Furthermore, the body 1 is provided with multiple slots 12, and the outer circumferential side of the elastic element 21 is engaged in the slots 12, pressing the valve core 22 into the injection hole 11. The outer circumferential side of the elastic element 21 is fixed by being engaged in the slots 12, preventing the elastic element 21 from falling off. Specifically, the wall of the circular hole 213 of the elastic element 21 extends towards the valve core 22 to form an annular column, which abuts against the core 223, so that the valve core 22 is pressed into the injection hole 11 to seal the injection hole 11.

[0059] During implementation, when performing secondary injection into the body 1, the circumferential outer side of the elastic element 21 is disengaged from the slot 12 and the valve core 22. The valve core 22 is then removed from the first hole 111 by holding the protrusion 225, and the sealing gasket 25 of the second hole 112 is removed to achieve secondary injection into the injection hole 11. This process can save on temporary sealing pins, thereby saving costs.

[0060] This utility model also provides a battery, which includes a battery cell and a battery casing with an integrated structure of any of the above embodiments, wherein the battery cell is installed inside the body 1.

[0061] It is understood that the battery of this utility model uses the aforementioned integrated battery casing, in which the body 1 of the integrated battery casing is provided with an injection hole 11, and an elastic element 21 is disposed on the body 1, pressing the valve core 22 into the injection hole 11 so that the valve core 22 seals the injection hole 11. The valve core 22 is configured such that when the pressure inside the body 1 is greater than a preset value, the valve core 22 moves along the injection hole 11, so that an exhaust gap is generated between the body 1 and the valve core 22, and drives the elastic element 21 to undergo elastic deformation. In the initial state, the elastic element 21 can hold the valve core 22 in the injection hole 11. When the pressure inside the body 1 is greater than the preset value, the internal air pressure will drive the valve core 22 to counteract the friction between the valve core 22 and the body 1 and move relative to the injection hole 11. The valve core 22 drives the elastic element 21 to undergo elastic deformation. During the movement of the valve core 22, an exhaust gap is generated between it and the body 1, and the internal gas is discharged from the exhaust gap to prevent the deformation and expansion of the body 1. When the pressure inside the body 1 is less than or equal to the preset value, the valve core 22 is re-pressed into the injection hole 11 under the drive of the elastic element 21, sealing the injection hole 11.

[0062] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A battery casing with an integrated structure, characterized in that, include: The body and the venting assembly are provided. The body is provided with a liquid injection hole. The venting assembly includes an elastic element and a valve core. The elastic element is disposed in the body and presses the valve core into the liquid injection hole so that the valve core seals the liquid injection hole. The valve core is configured to move along the liquid injection hole when the pressure in the body is greater than a preset value, so that an venting gap is generated between the body and the valve core, and the elastic element is driven to undergo elastic deformation.

2. The battery casing with an integrated structure according to claim 1, characterized in that, The elastic element includes a connecting portion and an abutting portion. The connecting portion is connected between the body and the abutting portion, and the abutting portion abuts against the valve core.

3. The battery casing with an integrated structure according to claim 2, characterized in that, The venting assembly also includes a seal, the valve core has a through hole for liquid injection, and the seal covers the through hole.

4. The battery casing with an integrated structure according to claim 3, characterized in that, The abutment portion is provided with a circular hole, which is used to avoid the sealing element.

5. The battery casing with an integrated structure according to any one of claims 1 to 3, characterized in that, The outer periphery of the valve core is provided with at least one mounting groove, and each mounting groove is provided with a sealing ring, which is clamped between the body and the valve core.

6. The battery casing with an integrated structure according to claim 5, characterized in that, The injection hole gradually narrows from the outside of the body to the inside of the body.

7. The battery casing with an integrated structure according to claim 1, characterized in that, The venting assembly further includes a sealing gasket, the injection port includes a first port and a second port communicating with the first port, the valve core is disposed in the first port, and the sealing gasket is disposed in the second port.

8. The battery casing with an integrated structure according to claim 7, characterized in that, The diameter of the first hole is larger than the diameter of the second hole to form a step on the wall of the injection hole. The first hole gradually narrows from the outside of the body to the inside of the body, and the second hole gradually narrows from the outside of the body to the inside of the body. The valve core includes a core body and a first insertion portion connected to the core body. The sealing gasket is provided with a second insertion portion. The first insertion portion and the second insertion portion cooperate with each other. The core body cooperates with the step.

9. The battery casing with an integrated structure according to claim 8, characterized in that, The valve core also includes a protrusion connected to the core body, and the elastic element has a circular hole in the middle, through which the elastic element is sleeved on the protrusion.

10. The battery casing with an integrated structure according to any one of claims 6 to 9, characterized in that, The body is provided with multiple slots, and the outer circumferential side of the elastic element is engaged in the slots to press the valve core into the injection hole.

11. The battery casing with an integral structure according to any one of claims 1 to 4 and 6 to 9, characterized in that, The body includes a top cover and a housing module connected to the top cover, with the injection hole located on the top cover.

12. A battery, characterized in that, The battery includes a cell and a battery housing with an integral structure as described in any one of claims 1 to 11, wherein the cell is mounted within the housing.

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