Power battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a power battery. The power battery comprises a shell, a supporting layer and a battery cell, wherein an anti-explosion valve is arranged at the bottom of the shell; the supporting layer is arranged in the shell and covers the anti-explosion valve, the supporting layer is provided with a plurality of channels, the channels communicate with the two sides of the supporting layer, and the multiple channels communicate with one another in the supporting layer; the battery cell is arranged on one side, deviating from the anti-explosion valve, of the supporting layer. In the power battery, the plurality of channels of the supporting layer are communicated with one another in the supporting layer, when the battery cell leaks gas, the gas mainly penetrates through the supporting layer from the channel closer to the gas leakage position and acts on the explosion-proof valve, and when the gas concentration at the closer position is high, the explosion-proof valve acts on the battery cell due to the fact that the plurality of channels are communicated with one another. And gas which cannot timely pass through the side of the anti-explosion valve can be diffused into other channels through the communicated positions, and then passes through the supporting layer from other channels to reach one side of the anti-explosion valve, so that when the battery cell leaks gas, the anti-explosion valve is opened more timely, and the effect of preventing the battery from exploding is better.

Description

Technical Field

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

[0002] The top cover of the battery is usually equipped with an explosion-proof valve. During the battery cycle, gas is generated and when the internal pressure of the battery reaches a certain limit, the gas may break through the explosion-proof valve and be discharged from the exhaust hole to prevent the battery from exploding. When the battery is installed on the vehicle, it is usually placed on the chassis of the vehicle body. The battery is placed vertically with its top cover facing upward. When gas breaks through the explosion-proof valve and sprays upward, it will bring great safety hazards to the passengers in the vehicle. Therefore, the existing technology sets the explosion-proof valve on the bottom surface of the battery housing, so that the explosion-proof valve faces downward to reduce the hidden dangers of vehicle use.

[0003] However, the battery cells in the shell will block the explosion-proof valve, affecting the discharge of gas, thereby causing thermal runaway or explosion, and the safety problem of battery use has not been solved. In the prior art, a support plate is set between the battery cell and the bottom of the shell, and air holes are opened on the support plate. On the one hand, the number of openings is limited, and the air passing effect does not meet expectations. On the other hand, due to the failure of the battery cell, the position of the gas leakage is not fixed. In the process of gas flowing to the explosion-proof valve, it generally passes through the closer air holes. The air passing volume per unit time of the air holes at the closer positions is certain, and the air passing volume of the air holes at the farther positions is very small, which may still lead to a small amount of air passing in a short time. The gas gathers in the shell, and the force of some gas does not act on the explosion-proof valve, causing the explosion-proof valve to fail to open in time, which is easy to cause battery explosion.

[0004] Therefore, it is urgent to design a power battery to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a power battery, when the battery core leaks, the gas can have more channels to reach the explosion-proof valve, the explosion-proof valve opens more timely, and the effect of preventing the battery from exploding is better.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A power battery comprises a shell and a battery cell, wherein an explosion-proof valve is arranged at the bottom of the shell, and the battery cell is arranged in the shell; wherein:

[0008] A first groove is formed at the bottom of the battery cell; and / or

[0009] The power battery further includes a support layer, which is disposed in the shell and covers the explosion-proof valve. The support layer has a plurality of channels, which connect the two sides of the support layer. The plurality of channels are interconnected in the support layer.

[0010] As an optional solution, the support layer is a fiber structure, and the fiber structure is staggered and crossed to form a plurality of the channels and connecting channels connecting the channels.

[0011] As an optional solution, the support layer is made of any one of a PP layer, a PI layer, a PET layer or an ABS layer.

[0012] As an optional solution, the supporting layer is made of insulating porous material.

[0013] As an optional solution, the thickness of the support layer is in the range of 0.5 mm to 5 mm.

[0014] As an optional solution, a plurality of second grooves are formed on a side of the support layer facing the explosion-proof valve, and one of the second grooves is arranged opposite to the explosion-proof valve.

[0015] As an optional solution, a fourth groove is formed on a side of the battery cell facing the support layer.

[0016] As an optional solution, the extension direction of the second groove and the extension direction of the fourth groove are arranged to cross each other.

[0017] As an optional solution, a mounting hole is provided at the bottom of the shell, the explosion-proof valve is installed in the mounting hole, and the top surface of the explosion-proof valve is located in the mounting hole.

[0018] As an optional scheme, the above-mentioned mounting hole is a countersunk hole, and the above-mentioned countersunk hole includes a first hole and a second hole connected, the diameter of the above-mentioned first hole is larger than the diameter of the above-mentioned second hole, and a limiting end surface is formed between the above-mentioned first hole and the above-mentioned second hole. The above-mentioned explosion-proof valve is clamped in the above-mentioned first hole and limited at the above-mentioned limiting end surface.

[0019] The beneficial effects of the utility model are:

[0020] The utility model provides a power battery, by setting a support layer between the bottom of the shell and the battery core, the support layer plays a role in supporting the battery core, so as to prevent the battery core from directly blocking the explosion-proof valve. In addition, multiple channels of the support layer are interconnected within the support layer. When the battery core leaks, the gas mainly passes through the support layer from the channel closer to the leaking position and acts on the explosion-proof valve. When the gas concentration at the closer position is high, since multiple channels are interconnected, the gas that cannot pass to the explosion-proof valve side in time can diffuse to other channels through the connected position, and then pass through the support layer from other channels to the side of the explosion-proof valve, thereby increasing the speed of the gas reaching the side of the explosion-proof valve. When the battery core leaks, the explosion-proof valve opens more timely, and the effect of preventing the battery from exploding is better; and / or, when there is gas leakage in the battery core, the first groove can be used as a gas accommodating space, so that the gas quickly reaches the bottom of the shell, and then the gas is more likely to act on the explosion-proof valve, so that the explosion-proof valve opens faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to explain the embodiments of the utility model or the technical solutions in the prior art more clearly and easily, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. The drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 is a cross-sectional view of a power battery provided in Embodiment 1 of the present utility model;

[0023] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0024] Figure 3 It is a partial cross-sectional view of a power battery provided by an embodiment of the utility model;

[0025] Figure 4 This is an exploded view of the battery cell and the support layer provided in the first embodiment of the utility model;

[0026] Figure 5 It is a partial cross-sectional view of the power battery provided in the second embodiment of the present utility model.

[0027] In the figure:

[0028] 10. Shell; 11. Mounting hole; 111. Second hole; 112. Limiting end surface; 20. Support layer; 21. Second groove; 22. Third groove; 30. Battery cell; 31. Fourth groove; 32. First groove; 40. Explosion-proof valve. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0030] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0033] Embodiment 1

[0034] This embodiment provides a power battery. When the battery cell 30 leaks, the gas can have more channels to reach the explosion-proof valve 40, and the explosion-proof valve 40 can be opened more timely, thereby preventing the battery from exploding better. Figure 1 and Figure 2As shown, the power battery includes a shell 10, a support layer 20 and a battery cell 30. An explosion-proof valve 40 is arranged at the bottom of the shell 10; the support layer 20 is arranged in the shell 10 and covers the explosion-proof valve 40. The support layer 20 has a plurality of channels (not marked), and the channels connect the two sides of the support layer 20. The plurality of channels are interconnected in the support layer 20; the battery cell 30 is arranged on the side of the support layer 20 away from the explosion-proof valve 40.

[0035] The above-mentioned power battery is provided with a support layer 20 between the bottom of the shell 10 and the battery cell 30. The support layer 20 plays a role in supporting the battery cell 30, so as to prevent the battery cell 30 from directly blocking the explosion-proof valve 40. In addition, the multiple channels of the support layer 20 are interconnected within the support layer 20. When the battery cell 30 leaks, the gas mainly passes through the support layer 20 from the channel closer to the leaking position and acts on the explosion-proof valve 40. When the gas concentration at the closer position is high, since the multiple channels are interconnected, the gas that cannot reach the explosion-proof valve 40 side in time can diffuse to other channels through the connected position, and then pass through the support layer 20 from other channels to reach the explosion-proof valve 40 side, thereby increasing the speed at which the gas reaches the explosion-proof valve 40 side. When the battery cell 30 leaks, the explosion-proof valve 40 opens more timely, and the effect of preventing the battery from exploding is better.

[0036] In an optional embodiment, the support layer 20 may be plate-shaped, the channels are constructed in the form of air holes, and connecting holes are provided between the channels.

[0037] Optionally, in this embodiment, the support layer 20 is composed of a plurality of fiber structures, and the fiber structures are staggered and crossed to form a plurality of channels and connecting channels between the connecting channels. It can be understood that the channel is formed by the material structure of the support layer 20 itself. Due to the existence of the fiber structure, the shape of each channel is different. The channel in this embodiment forms countless channels on the basis of ensuring the strength of the support layer 20. There is no need to set up a special connecting structure between the channels, which has a better ventilation effect and is more conducive to the rapid arrival of the gas at the explosion-proof valve 40, so as to facilitate the timely pressure relief of the battery.

[0038] Optionally, the material of the support layer 20 is any one of a PP layer, a PI layer, a PET layer or an ABS layer. All of the above materials can support a fiber-shaped support layer 20 with a certain thickness and support strength, and have a good insulation effect.

[0039] In other embodiments, the support layer 20 is made of an insulating porous material. It is understood that the holes are interconnected and the holes are connected to form channels. Optionally, the porous structure can be made of hard sponge.

[0040] Optionally, the thickness of the support layer 20 is in the range of 0.5 mm to 5 mm. The support layer 20 within this range has a certain strength, and while insulating the battery cell 30 and the housing 10, it can also provide a passage for gas discharge, so that the explosion-proof valve 40 can be opened in time. Exemplarily, the thickness of the support layer 20 can be 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.5 mm, 1.6 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 4.8 mm, etc.

[0041] Alternatively, if Figure 3 As shown, the support layer 20 is provided with a plurality of second grooves 21 on one side facing the explosion-proof valve 40, wherein one second groove 21 is arranged opposite to the explosion-proof valve 40. The second groove 21 is used to avoid the explosion-proof valve 40, so as to facilitate gas convergence and timely exhaust. It can be understood that the provision of the second groove 21 is equivalent to shortening the length of part of the channel, so that the gas can quickly reach the explosion-proof valve 40 after a short-distance overflow.

[0042] For the sake of convenience, the second groove 21 that is not arranged opposite to the explosion-proof valve 40 is defined as the third groove 22. The third groove 22 corresponds to the bottom surface of the shell 10. The setting of the third groove 22 can also allow the gas to reach the third groove 22 through a shorter channel, and the gas then overflows from the third groove 22 to the second groove 21. Compared with the solution of only opening one second groove 21, the gas overflows faster.

[0043] The second groove 21 and the third groove 22 may be circular, square, diamond, strip, etc., which are not limited here.

[0044] Alternatively, if Figure 4 As shown, the fourth groove 31 is provided on the side of the battery cell 30 facing the support layer 20. Through the above arrangement, the gas can reach the upper side of the support layer 20 faster. It can be understood that if the battery cell 30 does not have the fourth groove 31, the gas will escape from the gap between the battery cell 30 and the shell 10 at a slower speed. The fourth groove 31 can provide a larger flow space for the gas, so that the gas gathers at the fourth groove 31 and then enters the channel downward, further improving the speed at which the gas reaches the explosion-proof valve 40.

[0045] Alternatively, if Figure 4 As shown, the extension direction of the second groove 21 and the extension direction of the fourth groove 31 are arranged crosswise. While improving the flowability of the gas at the bottom of the battery cell 30, it can also ensure the support strength of the support layer 20 to the battery cell 30, and avoid the battery cell 30 bending and deforming the support layer 20, causing the internal passage to be blocked and affecting the exhaust. Furthermore, the extension direction of the third groove 22 is also arranged crosswise with the extension direction of the fourth groove 31, and their functions are the same, which will not be repeated here.

[0046] Alternatively, if Figure 4 As shown, the second groove 21 and the third groove 22 extend along the width direction of the battery, and the fourth groove 31 extends along the length direction of the battery. This arrangement can ensure that the second groove 21, the third groove 22 and the fourth groove 31 have a larger groove area. The angle between the second groove 21 and the fourth groove 31 is 90°, which has a better effect of preventing the support layer 20 from being bent.

[0047] Alternatively, if Figure 2 As shown, a mounting hole 11 is provided at the bottom of the shell 10, and the mounting hole 11 is a countersunk hole. The explosion-proof valve 40 is installed in the mounting hole 11, and the top surface of the explosion-proof valve 40 is located in the mounting hole 11. On the one hand, it prevents the explosion-proof valve 40 from occupying the space inside the shell 10 for accommodating the battery cell 30, and on the other hand, it ensures that the gas reaches the explosion-proof valve 40 more smoothly after passing through the channel and triggers the explosion-proof valve 40. Preferably, the top surface of the explosion-proof valve 40 is located below the inner surface of the bottom of the shell 10, so that more space is reserved above the explosion-proof valve 40 for gas to gather and facilitate the discharge of gas. Optionally, as Figure 2 As shown, the countersunk hole includes a first hole (coinciding with the explosion-proof valve 40 in the figure, so it is not marked) and a second hole 111 that are connected. The diameter of the first hole is larger than the diameter of the second hole 111. A limiting end face 112 is formed between the first hole and the second hole 111. The explosion-proof valve 40 is clamped in the first hole and limited to the limiting end face 112. In the above arrangement, the setting of the limiting end face 112 facilitates the rapid installation of the explosion-proof valve 40. At the same time, the setting of the second hole 111 allows the explosion-proof valve 40 to have a certain distance from the bottom of the housing 10, which facilitates the discharge of gas after the explosion-proof valve 40 is opened.

[0048] Optionally, the power battery further includes a top cover assembly, which is used to seal the open end of the shell 10 .

[0049] Among them, the top cover assembly includes a top cover sheet, a pole, an upper plastic, a lower plastic and a sealing ring. The top cover sheet is covered on the open end of the shell; the pole passes through the top cover sheet; the upper plastic is arranged on the top of the top cover sheet, and the top end of the pole passes through the upper plastic to insulate the pole and the top cover sheet; the lower plastic is arranged at the bottom of the top cover sheet, and the top end of the pole passes through the lower plastic to insulate the pole and the top cover sheet; the sealing ring is arranged between the pole and the top cover sheet, which not only insulates the pole and the top cover sheet, but also plays a role of sealing connection to ensure the sealing of the battery.

[0050] Optionally, a liquid injection hole is provided on the top cover sheet for a liquid injection device to inject electrolyte into the battery;

[0051] Optionally, the top cover assembly further includes a sealing nail, which is used to seal the injection hole after injection to ensure the sealing of the battery.

[0052] Optionally, the battery cell is further provided with a pole ear, and an adapter is connected between the pole ear and the corresponding pole. The adapter is used to realize electrical connection between the pole and the battery cell, so that the battery can supply power to the outside.

[0053] Embodiment 2

[0054] This embodiment provides a power battery, such as Figure 5 As shown, the power battery includes a shell 10 and a battery cell 30 accommodated in the shell 10, an explosion-proof valve 40 is installed at the bottom of the shell 10, and a first groove 32 is opened on the bottom side of the battery cell 30. When gas leaks from the battery cell 30, the first groove 32 can be used as a gas accommodating space, so that the gas quickly reaches the bottom of the shell 10, and then the gas is more easily acted on the explosion-proof valve 40, so that the explosion-proof valve 40 opens faster.

[0055] Optionally, a plurality of first grooves 32 are provided, and one of the first grooves 32 is directly opposite to the explosion-proof valve 40 , so that the gas gathers above the explosion-proof valve 40 .

[0056] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A power battery, characterized in that: It comprises a shell (10) and a battery cell (30), wherein an explosion-proof valve (40) is arranged at the bottom of the shell (10), and the battery cell (30) is arranged in the shell (10); wherein: A first groove (32) is provided at the bottom of the battery cell (30); and / or The power battery further comprises a support layer (20), the support layer (20) being arranged in the housing (10) and covering the explosion-proof valve (40), the support layer (20) having a plurality of channels, the channels being connected to two sides of the support layer (20), and the plurality of channels being connected to each other in the support layer (20).

2. The power battery according to claim 1, characterized in that: The support layer (20) is a fiber structure, and the fiber structure is staggered and crossed to form a plurality of channels and connecting channels connecting the channels.

3. The power battery according to claim 2, characterized in that: The support layer (20) is made of any one of a PP layer, a PI layer, a PET layer or an ABS layer.

4. The power battery according to claim 1, characterized in that: The supporting layer (20) is made of insulating porous material.

5. The power battery according to claim 1, characterized in that: The thickness of the support layer (20) ranges from 0.5 mm to 5 mm.

6. The power battery according to any one of claims 1 to 5, characterized in that: A plurality of second grooves (21) are provided on a side of the support layer (20) facing the explosion-proof valve (40), wherein one of the second grooves (21) is arranged opposite to the explosion-proof valve (40).

7. The power battery according to claim 6, characterized in that: A fourth groove (31) is formed on a side of the battery core (30) facing the support layer (20).

8. The power battery according to claim 7, characterized in that: The extension direction of the second groove (21) and the extension direction of the fourth groove (31) are arranged to intersect.

9. The power battery according to any one of claims 1 to 5, characterized in that: The bottom of the shell (10) is provided with a mounting hole (11), the explosion-proof valve (40) is mounted in the mounting hole (11), and the top surface of the explosion-proof valve (40) is located in the mounting hole (11).

10. The power battery according to claim 9, characterized in that: The mounting hole (11) is a countersunk hole, the countersunk hole comprises a first hole and a second hole (111) connected to each other, the diameter of the first hole is larger than the diameter of the second hole (111), a limiting end surface (112) is formed between the first hole and the second hole (111), and the explosion-proof valve (40) is clamped in the first hole and limited at the limiting end surface (112).

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