Battery cell and battery pack with same

Abstract

The utility model discloses a single battery and a battery pack with the same, the single battery is used for the battery pack, the single battery comprises a pole group, a shell, a cover plate and an insulating part, the pole group is arranged in the shell, and openings are formed in two ends of the shell in the length direction; the two cover plates cover the two ends, provided with the openings, of the shell, and at least one cover plate is provided with an anti-explosion valve; the insulating part is arranged between the pole group and the cover plate, a first through hole is formed in the insulating part and is opposite to the anti-explosion valve, and the axis of the first through hole inclines towards the direction away from the bottom wall of the shell in the direction from the pole group to the anti-explosion valve. According to the single battery disclosed by the utility model, on the premise of not reducing the energy density of the single battery, the structural strength of the single battery is guaranteed, the impact resistance of the anti-explosion valve can be remarkably improved, and the condition that the anti-explosion valve is cracked when the anti-explosion valve is impacted by electrolyte is prevented.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of batteries, and in particular to a battery cell and a battery pack having the same. Background Art

[0002] When the explosion-proof valve on the cover of the blade battery cell is located at the bottom of the battery pack, a cavity is formed between the end plate and the explosion-proof valve inside the battery cell, and the electrolyte will accumulate in the cavity; when the battery cell is shaken, the electrolyte will shake back and forth, continuously impacting the explosion-proof valve, causing the explosion-proof valve to be damaged, the battery cell to leak, and the explosion-proof valve to open prematurely. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a battery cell that can significantly improve the impact resistance of the explosion-proof valve, preventing the explosion-proof valve from cracking when the electrolyte impacts the explosion-proof valve.

[0004] The present invention also provides a battery pack, which includes the above-mentioned battery cell.

[0005] According to an embodiment of the utility model, a battery cell is used in a battery pack, and the battery cell includes a pole group, a shell, a cover plate and an insulating member. The pole group is placed in the shell, and openings are provided at both ends of the shell in the longitudinal direction; two cover plates are provided on the two ends of the shell with the openings, and at least one cover plate is provided with an explosion-proof valve; the insulating member is provided between the pole group and the cover plate, and a first through hole is provided on the insulating member, and the first through hole is arranged opposite to the explosion-proof valve. Along the direction from the pole group to the explosion-proof valve, the axis of the first through hole is inclined in the direction away from the bottom wall of the shell.

[0006] According to the battery cell of the embodiment of the present invention, the electrode group is placed in the shell, two cover plates are covered at the two ends of the shell with openings, and an insulating member is provided between the electrode group and the cover plate. The first through hole of the insulating member is arranged opposite to the explosion-proof valve on the cover plate. Along the direction from the electrode group to the explosion-proof valve, the axis of the first through hole is inclined in the direction away from the bottom wall of the shell. When the battery cell is installed in the battery pack, the hole position of the first through hole on the side where the explosion-proof valve is located is higher, so that the electrolyte can smoothly flow back to the side where the electrode group is located, and when the electrolyte impacts from the side where the electrode group is located to the side where the explosion-proof valve is located, the electrolyte cannot smoothly pass through the first through hole, and the kinetic energy of the electrolyte flow will be consumed, reducing the impact force of the electrolyte on the explosion-proof valve. Without reducing the energy density of the battery cell, the structural strength of the battery cell is guaranteed, and the impact resistance of the explosion-proof valve can be significantly improved, preventing the explosion-proof valve from cracking when the electrolyte impacts the explosion-proof valve.

[0007] In some embodiments of the present invention, a plurality of the first through holes are provided, and the plurality of the first through holes are arranged in multiple rows and columns.

[0008] In some embodiments of the present invention, a ventilation groove is provided on one side of the insulating member close to the explosion-proof valve, and the first through hole is provided at the bottom of the ventilation groove.

[0009] In some embodiments of the present invention, a first reinforcing rib is provided in the ventilation groove.

[0010] In some embodiments of the present invention, a second through hole is provided on the insulating member, a pole ear is provided on a side of the pole group close to the insulating member, a pole is provided on the cover plate, and the pole ear and the pole are connected at the second through hole.

[0011] In some embodiments of the present invention, a tab support plate is provided on a side of the second through hole close to the explosion-proof valve, and the tab support plate extends along the length direction of the insulating member.

[0012] In some embodiments of the present invention, a liquid injection hole is provided on the cover plate, and a third through hole is provided on the insulating member at a position corresponding to the liquid injection hole.

[0013] In some embodiments of the present invention, a liquid injection groove is provided on one side of the insulating member close to the liquid injection hole, and the third through hole is provided at the bottom of the liquid injection groove.

[0014] In some embodiments of the present invention, a second reinforcing rib is provided in the liquid injection groove.

[0015] A battery pack according to an embodiment of the present invention includes the above-mentioned battery cell, and the battery cell is connected to the bottom wall of the battery pack.

[0016] According to the battery pack of the embodiment of the present invention, the electrode group is placed in the shell, two cover plates are covered at the two ends of the shell with openings, and an insulating member is provided between the electrode group and the cover plate. The first through hole of the insulating member is arranged opposite to the explosion-proof valve on the cover plate. Along the direction from the electrode group to the explosion-proof valve, the axis of the first through hole is inclined in the direction away from the bottom wall of the shell. When the battery cell is installed in the battery pack, the hole position of the first through hole on the side where the explosion-proof valve is located is higher, so that the electrolyte can smoothly flow back to the side where the electrode group is located, and when the electrolyte impacts from the side where the electrode group is located to the side where the explosion-proof valve is located, the electrolyte cannot smoothly pass through the first through hole, and the kinetic energy of the electrolyte flow will be consumed, reducing the impact force of the electrolyte on the explosion-proof valve. Without reducing the energy density of the battery cell, the structural strength of the battery cell is guaranteed, and the impact resistance of the explosion-proof valve can be significantly improved, preventing the explosion-proof valve from cracking when the electrolyte impacts the explosion-proof valve.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a perspective view of an insulating member according to an embodiment of the present utility model;

[0020] Figure 2 It is a top view of the ventilation groove of the insulating member according to an embodiment of the present utility model.

[0021] Reference numerals:

[0022] 100. Insulation parts;

[0023] 1. First through hole; 2. Ventilation groove; 3. First reinforcing rib;

[0024] 4. Second through hole; 41. Tab support plate;

[0025] 5. Third through hole; 6. Liquid injection groove;

[0026] 7. Second reinforcing rib; 71. First sub-reinforcing rib; 72. Second sub-reinforcing rib. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0029] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0030] Reference below Figure 1-Figure 2 A battery cell according to the present invention is described.

[0031] The battery cell according to the embodiment of the present invention includes an electrode group, a housing, a cover plate and an insulating member 100 .

[0032] Specifically, battery cells are used in battery packs, and the electrode assembly is placed in a housing. The housing protects the electrode assembly from damage by external impact. The housing has openings at both ends along its length, allowing the electrode assembly to enter the housing through the openings, making assembly of the electrode assembly more convenient.

[0033] Two cover plates are installed at both ends of the housing where the openings are located. The cover plates protect the openings, preventing foreign matter from entering the electrode assembly through the openings and damaging the electrode assembly. The cover plates and the housing form a sealed space with sufficient mechanical strength to protect the electrode assembly and prevent damage from external impact. At least one cover plate is equipped with an explosion-proof valve. This allows the high-temperature gas generated by thermal runaway of the electrode assembly to break through the explosion-proof valve and release pressure to the outside, preventing the danger of excessive gas pressure inside the battery cell and causing explosion. It also can promptly reduce the temperature inside the battery cell, minimizing the risk of thermal runaway of the battery cell spreading to adjacent battery cells.

[0034] The insulating member 100 is provided between the electrode group and the cover plate to achieve insulation between the electrode group and the cover plate, thereby preventing current from piercing or falling off between the electrode group and the cover plate, and effectively reducing the occurrence of short circuits. Figure 1 As shown, the insulating member 100 is provided with a first through hole 1, which is arranged opposite the explosion-proof valve. The first through hole 1 can connect the electrode group and the explosion-proof valve, so that the gas in the housing can smoothly pass through the first through hole 1 on the insulating member 100 and rush out of the explosion-proof valve during thermal runaway.

[0035] A cavity is formed between the insulating member 100 and the cover plate, and the electrolyte inside the battery cell will accumulate in the cavity. When the battery cell is shaken, the electrolyte will swing back and forth, continuously impacting the explosion-proof valve, causing damage to the explosion-proof valve, leakage of the battery cell, and premature opening of the explosion-proof valve.

[0036] like Figure 1 As shown, the axis of the first through hole 1 is inclined in a direction away from the bottom wall of the housing along the direction from the electrode group to the explosion-proof valve. It is understandable that when the battery cell is installed in the battery pack, the bottom wall of the housing is located at the lower end of the battery cell. The first through hole 1 is positioned higher on the side where the explosion-proof valve is located, allowing the electrolyte to flow smoothly back to the side where the electrode group is located. Conversely, when the electrolyte impacts from the side where the electrode group is located toward the side where the explosion-proof valve is located, the electrolyte cannot smoothly pass through the first through hole 1, and the kinetic energy of the electrolyte flow is consumed, reducing the impact force of the electrolyte on the explosion-proof valve. This ensures the structural strength of the battery cell without reducing the energy density of the battery cell, significantly improves the impact resistance of the explosion-proof valve, and prevents the explosion-proof valve from cracking when the electrolyte impacts the explosion-proof valve.

[0037] According to the battery cell of the embodiment of the present invention, the electrode group is placed in the shell, two cover plates are covered at the two ends of the shell with openings, and the insulating member 100 is arranged between the electrode group and the cover plate. The first through hole 1 of the insulating member 100 is arranged opposite to the explosion-proof valve on the cover plate. Along the direction from the electrode group to the explosion-proof valve, the axis of the first through hole 1 is inclined in the direction away from the bottom wall of the shell. When the battery cell is installed in the battery pack, the hole position of the first through hole 1 on the side where the explosion-proof valve is located is higher, so that the electrolyte can smoothly flow back to the side where the electrode group is located, and when the electrolyte impacts from the side where the electrode group is located to the side where the explosion-proof valve is located, the electrolyte cannot smoothly pass through the first through hole 1, and the kinetic energy of the electrolyte flow will be consumed, reducing the impact force of the electrolyte on the explosion-proof valve. Without reducing the energy density of the battery cell, the structural strength of the battery cell is guaranteed, and the impact resistance of the explosion-proof valve can be significantly improved, preventing the explosion-proof valve from cracking when the electrolyte impacts the explosion-proof valve.

[0038] In some embodiments of the present invention, in some embodiments of the present invention, as Figure 1 and Figure 2As shown, there are multiple first through holes 1, and the multiple first through holes 1 are arranged in multiple rows and columns. Exemplarily, the first through holes 1 are arranged in a square shape, and there are 44 first through holes 1, which are arranged in a 4×11 matrix. The layout of the multiple first through holes 1 is relatively regular.

[0039] In some embodiments of the present invention, Figure 1 As shown, a vent groove 2 is provided on one side of the insulating member 100 near the explosion-proof valve, and a first through-hole 1 is provided at the bottom of the vent groove 2. In the event of thermal runaway, gas within the housing can first pass through the first through-hole 1 of the insulating member 100, then enter the vent groove 2, and finally break through the explosion-proof valve to be discharged from the battery cell. Furthermore, the first through-hole 1 can partially block the electrolyte from entering the vent groove 2, preventing damage to the explosion-proof valve, leakage from the battery cell, and premature opening of the explosion-proof valve.

[0040] Furthermore, if Figure 1 As shown, reinforcing ribs are provided in the ventilation groove 2. For example, three first reinforcing ribs 3 are provided, and the first reinforcing ribs 3 are placed in the middle intervals of the plurality of first through holes 1 arranged in a 4×11 matrix, which ensures the strength of the ventilation groove 2 without affecting the ventilation of the first through holes 1.

[0041] In some embodiments of the present invention, Figure 1 As shown, the insulating member 100 is provided with a second through hole 4, the electrode group is provided with a terminal lug on the side close to the insulating member 100, and the cover is provided with a terminal post, and the terminal lug and the terminal post are connected at the second through hole 4. This not only achieves electrical continuity between the electrode group and the terminal post on the cover, but also prevents puncture or detachment between the electrode group and the cover, ensuring the normal use and service life of the battery cell.

[0042] In some embodiments of the present invention, Figure 1 As shown, a tab support plate 41 is provided on one side of the second through hole 4 close to the explosion-proof valve. The tab support plate 41 extends along the length direction of the insulating member 100 (eg Figure 1 When the battery cell is displaced, the electrode assembly inside the housing is prevented from shaking under the load generated by the movement, the electrode assembly is prevented from pulling the welding points between the electrode tabs and the electrode posts, and puncture or detachment between the electrode assembly and the cover plate is avoided, thereby ensuring the normal use and service life of the battery cell.

[0043] In some embodiments of the present invention, a liquid injection hole is provided on the cover plate, and a third through hole 5 is provided on the insulating member 100 at a position corresponding to the liquid injection hole. The electrolyte enters the battery cell through the liquid injection hole on the cover plate, enters the housing through the liquid injection hole, and then enters the electrode group through the third through hole 5, making the electrolyte injection process more reliable.

[0044] In some embodiments of the present invention, Figure 1As shown, a liquid injection groove 6 is provided on one side of the insulating member 100 near the liquid injection hole, and a third through hole 5 is provided at the bottom of the liquid injection groove 6. When injecting electrolyte, external electrolyte enters the liquid injection groove 6 through the liquid injection hole and enters the position of the electrode group through the third through hole 5, making the electrolyte injection process more reliable.

[0045] Furthermore, if Figure 1 As shown, a second reinforcing rib 7 is provided in the liquid injection groove 6. For example, the reinforcing rib is provided with three strips along the width direction of the insulating member 100 (eg Figure 1 A first sub-reinforcing rib 71 extending in the second direction (as shown) and a second sub-reinforcing rib 72 extending along the length direction of the insulating member 100, the second reinforcing rib 7 is placed in the middle interval position of the multiple third through holes 5 arranged in a matrix of multiple rows and columns, which ensures the strength of the liquid injection groove 6 without affecting the liquid injection effect of the third through holes 5.

[0046] In some embodiments of the present invention, along the thickness direction of the insulating member 100, the side of the insulating member 100 close to the pole group is in contact with the pole group. When thermal runaway occurs, the gas in the shell can first pass through the first through hole 1 of the insulating member 100 more smoothly, so that the thermal runaway gas enters the vent groove 2 and finally breaks through the explosion-proof valve to be discharged from the battery cell, thereby increasing the thermal safety of the battery cell.

[0047] In some embodiments of the present invention, the insulating member 100 is a plastic member. The insulating member 100 has good insulation properties and can be processed by injection molding or other methods. Therefore, the manufacturing process of the insulating member 100 is relatively simple.

[0048] A battery pack according to an embodiment of the present invention includes the above-mentioned battery cell, and the battery cell is connected to the bottom wall of the battery pack.

[0049] According to the battery pack of the embodiment of the present invention, the electrode group is placed in the shell, two cover plates are covered at the two ends of the shell with openings, and the insulating member 100 is arranged between the electrode group and the cover plate. The first through hole 1 of the insulating member 100 is arranged opposite to the explosion-proof valve on the cover plate. Along the direction from the electrode group to the explosion-proof valve, the axis of the first through hole 1 is inclined in the direction away from the bottom wall of the shell. When the battery cell is installed in the battery pack, the hole position of the first through hole 1 on the side where the explosion-proof valve is located is higher, so that the electrolyte can smoothly flow back to the side where the electrode group is located, and when the electrolyte impacts from the side where the electrode group is located to the side where the explosion-proof valve is located, the electrolyte cannot smoothly pass through the first through hole 1, and the kinetic energy of the electrolyte flow will be consumed, reducing the impact force of the electrolyte on the explosion-proof valve. Without reducing the energy density of the battery cell, the structural strength of the battery cell is guaranteed, and the impact resistance of the explosion-proof valve can be significantly improved, preventing the explosion-proof valve from cracking when the electrolyte impacts the explosion-proof valve.

[0050] Other structures and operations of the battery cell and the battery pack having the same according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0051] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0052] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell for a battery pack, characterized in that: include: Pole group; A shell, wherein the pole group is placed in the shell, and the shell has openings at both ends in the longitudinal direction; Cover plates, two of which are provided on both ends of the housing where the opening is provided, and at least one of which is provided with an explosion-proof valve; An insulating member is arranged between the pole group and the cover plate, and a first through hole is provided on the insulating member. The first through hole is arranged opposite to the explosion-proof valve, and along the direction from the pole group to the explosion-proof valve, the axis of the first through hole is inclined toward a direction away from the bottom wall of the shell.

2. The battery cell according to claim 1, wherein: A plurality of the first through holes are provided, and the plurality of the first through holes are arranged in multiple rows and columns.

3. The battery cell according to claim 1, wherein: A ventilation groove is provided on one side of the insulating member close to the explosion-proof valve, and the first through hole is provided at the bottom of the ventilation groove.

4. The battery cell according to claim 3, characterized in that A first reinforcing rib is arranged in the ventilation groove.

5. The battery cell according to claim 1, characterized in that A second through hole is provided on the insulating member, a pole ear is provided on a side of the pole group close to the insulating member, a pole column is provided on the cover plate, and the pole ear and the pole column are connected at the second through hole.

6. The battery cell according to claim 5, characterized in that A tab support plate is provided on one side of the second through hole close to the explosion-proof valve, and the tab support plate extends along the length direction of the insulating member.

7. The battery cell according to claim 1, characterized in that The cover plate is provided with a liquid injection hole, and the insulating member is provided with a third through hole at a position corresponding to the liquid injection hole.

8. The battery cell according to claim 7, characterized in that A liquid injection groove is provided on one side of the insulating member close to the liquid injection hole, and the third through hole is provided at the bottom of the liquid injection groove.

9. The battery cell according to claim 8, characterized in that A second reinforcing rib is provided in the liquid injection groove.

10. A battery pack, characterized in that: include: The battery cell according to any one of claims 1 to 9, wherein the battery cell is connected to the bottom wall of the battery pack.

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