A battery and battery pack

Abstract

This utility model discloses a battery and battery pack. The battery includes a casing, a battery cell, a base plate, and an explosion-proof valve. The bottom surface of the casing has a vent, which is covered by the explosion-proof valve. The battery cell and the base plate are disposed inside the casing, with the base plate positioned between the battery cell and the vent. The base plate has a body and a support portion, with the support portion positioned between the body and the bottom surface of the casing. The support portion is offset from the vent. The ratio of the area of ​​the support portion projected onto the body to the area of ​​the body is 50% to 90%. This design increases the strength of the base plate and the stability of the battery cell support, while also increasing the venting space and improving the venting effect. The offset arrangement of the support portion and the vent prevents the base plate from blocking the vent, eliminating interference and ensuring that gas and heat flow through the vent to the explosion-proof valve.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more particularly to a battery and battery pack. Background Technology

[0002] With the continuous development of new energy battery technology, battery safety performance is receiving increasing attention. Battery covers are typically equipped with explosion-proof valves. When gas is generated inside the battery due to abnormal operation, the gas can be released through the explosion-proof valve to prevent major safety accidents. Currently, to rationally plan the venting channel, the explosion-proof valve can be placed on the bottom surface of the casing, and a base plate can be installed between the bottom surface of the casing and the battery cell to support the battery cell. However, the base plate may interfere with the venting port, potentially causing poor venting. Utility Model Content

[0003] This utility model provides a battery and battery pack to eliminate the interference of the bottom plate on the exhaust port and improve the pressure relief effect.

[0004] In a first aspect, the present invention provides a battery comprising: a casing, a battery cell, a bottom plate, and an explosion-proof valve. The bottom surface of the casing has an exhaust port, which is covered by the explosion-proof valve. The battery cell and the bottom plate are disposed inside the casing, and the bottom plate is disposed between the battery cell and the exhaust port.

[0005] The base plate has a body and a support part. The support part is located between the bottom surface of the body and the outer shell, and the support part is offset from the exhaust port. The ratio of the area of ​​the support part projected onto the body to the area of ​​the body is 50% to 90%.

[0006] Secondly, this utility model provides a battery pack, including: a housing and a battery as described in the first aspect above, the battery being disposed within the housing.

[0007] The beneficial effects of this utility model are as follows:

[0008] This utility model provides a battery and battery pack. If the ratio of the projected area of ​​the support portion onto the main body to the area of ​​the main body is simply referred to as the area ratio, then a too small area ratio results in insufficient support area for the support portion, potentially reducing the support strength and consequently decreasing the stability of the bottom support plate for the battery cell. Conversely, a too large area ratio results in an excessively large support portion, reducing the space between the main body and the bottom surface of the outer casing, thus decreasing the venting space. Therefore, setting the area ratio within the aforementioned range increases the strength of the bottom support plate and the stability of the battery cell support, while also increasing the venting space and improving the exhaust effect. Furthermore, the staggered arrangement of the support portion and the exhaust port prevents the bottom support plate from blocking the exhaust port, eliminating interference and ensuring that gas and heat flow to the explosion-proof valve through the exhaust port. Attached Figure Description

[0009] Figure 1 This is a three-dimensional structural diagram of the battery provided in the embodiment of this utility model;

[0010] Figure 2 This is a cross-sectional view of the base plate provided in the embodiment of this utility model;

[0011] Figure 3 For along Figure 2 A top view of a base plate indicated by the thick black arrow in the middle;

[0012] Figure 4 For along Figure 2 A top view of a base plate indicated by the thick black arrow in the middle;

[0013] Figure 5 For along Figure 2 A top view of a base plate indicated by the thick black arrow in the middle;

[0014] Figure 6 For along Figure 2 A top view of a base plate indicated by the thick black arrow in the middle;

[0015] Figure 7 This is a schematic diagram of the structure of a battery pack provided in an embodiment of the present utility model.

[0016] Figure label:

[0017] 10-Outer shell, 11-Exhaust port, 12-Opening, 20-Battery cell, 30-Bottom support plate, 31-Body body, 32-Support part, 321-First support part, 322-Second support part, 40-Explosion-proof valve, b0-Bottom surface of outer shell, m1-First surface, m2-Second surface, T1-First air guide channel, T2-Second air guide channel. Detailed Implementation

[0018] The specific embodiments of a battery and battery pack provided by this utility model will be described in detail below with reference to the accompanying drawings. It should be noted that the described embodiments are only some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0019] This utility model embodiment provides a battery, such as Figures 1 to 6As shown, the battery may include: a casing 10, a battery cell 20, a bottom support plate 30, and an explosion-proof valve 40. The bottom surface b0 of the casing 10 has a vent 11, which is covered by the explosion-proof valve 40. The battery cell 20 and the bottom support plate 30 are disposed inside the casing 10, and the bottom support plate 30 is disposed between the battery cell 20 and the vent 11. When the casing 10 is a receiving cavity with an opening 12 at one end, the battery cell 20 and the bottom support plate 30 are disposed inside the receiving cavity.

[0020] The base plate 30 has a body 31 and a support part 32. The support part 32 is located between the body 31 and the bottom surface b0 of the outer shell 10. The support part 32 is offset from the exhaust port 11. The ratio of the positive projection area of ​​the support part 32 onto the body 31 to the area of ​​the body 31 is 50% to 90%. For example, the area ratio can be any value among 50%, 60%, 70%, 80%, 90% or 50% to 90%, which can be determined according to the actual situation.

[0021] Thus, if the ratio of the projected area of ​​the support portion 32 onto the body 31 to the area of ​​the body 31 is simply referred to as the area ratio, then if the area ratio is too small, the support area of ​​the support portion 32 on the body 31 will be too small, which may lead to a decrease in the support strength of the support portion 32 on the body 31, and further lead to a decrease in the support stability of the bottom support plate 30 on the battery cell 20. If the area ratio is too large, the size of the support portion 32 will be too large, which will lead to a reduction in the space between the body 31 and the bottom surface b0 of the outer casing 10, reducing the air guiding space. Therefore, setting the area ratio within the above range can increase the strength of the bottom support plate 30 and the stability of the support for the battery cell 20, and also increase the air guiding space and improve the exhaust effect. In addition, the staggered arrangement of the support portion 32 and the exhaust port 11 can prevent the bottom support plate 30 from blocking the exhaust port 11, eliminate the interference of the bottom support plate 30 on the exhaust port 11, and ensure that gas and heat flow to the explosion-proof valve 40 through the exhaust port 11.

[0022] Optionally, the body 31 and the support 32 can be integrally formed, which provides good fixation between the support 32 and the body 31, resulting in good strength and stability of the base plate 30. Alternatively, the body 31 and the support 32 can be two independently formed structures, connected by bonding, screwing, or other methods. Since the body 31 and the support 32 are two independently connected structures, heat conduction between them is relatively slow, which reduces deformation of the base plate 30 and improves its reliability.

[0023] Optionally, the height d2 of the support portion 32 can be set to 0.5mm to 2mm. For example, the height d2 of the support portion 32 can be any value among 0.5mm, 1mm, 1.5mm, 2mm, or 0.5mm to 2mm, depending on the actual situation. The height d2 of the support portion 32 can be considered as the length of the support portion 32 along the z-direction. Figure 2 As shown in the diagram, if the height d2 of the support portion 32 is too large, the volume of the base plate 30 will be too large, resulting in a decrease in the battery's capacity density; if the height d2 of the support portion 32 is too small, the ventilation space between the main body 31 and the bottom surface b0 of the outer casing 10 will be too small, resulting in a decrease in ventilation effect. Therefore, setting the height d2 of the support portion 32 within the above-mentioned range can ensure both a high capacity density and a good ventilation effect.

[0024] The length d3 of the support portion 32 can be set to 50mm to 180mm. For example, the length d3 of the support portion 32 can be any value among 50mm, 80mm, 100mm, 120mm, 140mm, 160mm, 180mm, or 50mm to 180mm, depending on the actual situation. The length d3 of the support portion 32 can be considered as the length of the support portion 32 along the x-direction. Figure 2 As shown in the diagram, if the length d3 of the support portion 32 is too large, the exhaust space between the main body 31 and the bottom surface b0 of the outer casing 10 will be too small, resulting in reduced exhaust efficiency; if the length d3 of the support portion 32 is too small, the support capacity of the support portion 32 for the main body 31 will be reduced, thereby reducing the stability of the base plate 30. Therefore, setting the length d3 of the support portion 32 within the above-mentioned range can achieve both good exhaust efficiency and improved stability of the base plate 30.

[0025] Alternatively, the following situations may be included when setting the support part 32:

[0026] Case 1: At least one support portion 32 is provided, and each support portion 32 is arranged continuously around the exhaust port 11. In this case, the support portion 32 can be referred to as the first support portion 321. The first support portion 321 can be a closed structure arranged around the exhaust port 11 (such as...). Figure 3 (as shown) or a non-closed structure (not shown). Among them, Figure 3 The example shown is a first support portion 321. In this way, the first support portion 321 can provide a uniform supporting force to the body 31, thereby providing better support for the body 31 and improving the stability of the base plate 30.

[0027] Furthermore, the first support portion 321 has a first surface m1 and a second surface m2 positioned opposite each other, with the first surface m1 facing the exhaust port 11 and the second surface m2 away from the exhaust port 11; the first support portion 321 has a first air guide channel T1 connecting the first surface m1 and the second surface m2. Thus, the provision of the first air guide channel T1 increases the flow of gas and heat from the second surface m2 to the first surface m1, allowing more gas and heat to flow to the exhaust port 11, thereby improving the exhaust efficiency.

[0028] Specifically, along the direction from the second surface m2 to the first surface m1, the first air guide channel T1 is inclined towards the bottom surface b0 of the outer casing 10. That is, compared with the opening of the first air guide channel T1 on the first surface m1, the opening of the first air guide channel T1 on the second surface m2 is farther from the bottom surface b0 of the outer casing 10, while the opening of the first air guide channel T1 on the first surface m1 is closer to the bottom surface b0 of the outer casing 10.

[0029] In this way, gas and heat can flow more smoothly through the first gas channel T1 to the exhaust port 11; and since impurities at the second surface m2 are more likely to deposit downwards under the action of gravity, when the opening of the first gas channel T1 at the second surface m2 is closer to the body 31, impurities can be prevented from being ejected through the exhaust port 11 and the explosion-proof valve 40. When the impurities contain conductive components, the battery can be prevented from being short-circuited with other structures through the impurities, thereby improving the reliability of the battery.

[0030] Of course, the extension direction of the first air guide channel T1 can also be parallel to the bottom surface b0 of the outer casing 10, which can also allow more gas and heat to flow to the exhaust port 11. However, the degree of improvement in exhaust effect is different compared with the inclined first air guide channel T1.

[0031] Case 2: Multiple support portions 32 are provided, with at least some support portions 32 arranged around and at intervals along the exhaust port 11. This can be achieved by all support portions 32 circling and at intervals along the exhaust port 11 (not shown in the figure); or by some support portions 32 circling and at intervals along the exhaust port 11, while the remaining support portions 32 are distributed in other locations, such as... Figure 6 As shown. This type of support 32 can be called the second support 322, meaning that the second support 322 is not continuously arranged around the exhaust port 11. In this way, the second support 322 can not only provide uniform support force to the body 31, but the gaps between the second support 322 can also be used as air guiding channels to transmit gas and heat, so that gas and heat can flow more smoothly to the exhaust port 11, thereby improving the exhaust effect.

[0032] Case 3: Multiple support portions 32 are provided, including a first support portion 321 and a second support portion 322. The first support portion 321 is arranged continuously around the exhaust port 11, while the second support portions 322 are arranged at intervals, such as... Figure 4 and Figure 5 As shown, only a portion of the support portions 32 are arranged continuously around the exhaust port 11. The distribution of the second support portions 322 is not limited to... Figure 4 and Figure 5 As shown, this is just a representation of... Figure 4 and Figure 5 This is just an example for illustration; the distribution of the second support portion 322 can be set as needed and is not limited here. Thus, the first support portion 321 and the second support portion 322 can further improve the support effect of the support portion 32 on the body 31, thereby further improving the stability of the base plate 30, and the gap between the second support portions 322 can also increase the venting effect. Case 3 can be seen as a combination of cases 1 and 2.

[0033] In practice, the arrangement of the support part 32 is not limited to the three situations mentioned above, and can also be a variation of the three situations mentioned above, which will not be listed one by one here.

[0034] Optionally, the body 31 has a second air guide channel T2 extending along the thickness direction of the body 31, such as... Figure 2 As shown, the thickness direction of the body 31 can be Figure 2 The second air guide channel T2 runs through the body 31 along the z-direction. In this way, the gas and heat released from the battery cell 20 can be discharged through the second air guide channel T2 to the bottom surface b0 between the body 31 and the outer shell 10, and then flow smoothly to the exhaust port 11 through the gap between the second support part 322 and the first air guide channel T1 in the first support part 321, thus improving the exhaust effect.

[0035] Among them, multiple second air guide channels T2 can be provided in the main body 31. These second air guide channels T2 can be distributed according to a certain pattern or randomly, which is not restricted here.

[0036] If the number of second air channels T2 is too large, the strength of the main body 31 will be reduced, which in turn will reduce the support capacity for the battery cell 20; if the number of second air channels T2 is too small, the obstruction to the flow of gas and heat released by the battery cell 20 to the exhaust port 11 will be greater. Therefore, the number of second air channels T2 can be set according to actual needs to meet the needs of different scenarios.

[0037] Based on the same inventive concept, this utility model embodiment also provides a battery pack, such as... Figure 7As shown, the battery pack may include: a housing 110 and a battery 120 as described in the present invention embodiment, wherein the battery 120 is disposed inside the housing 110.

[0038] Of course, in addition to the housing 110 and the battery 120, the battery pack may also include other structures, such as, but not limited to, a battery management system and a charging / discharging interface. The specific configuration can be set according to actual needs, and no specific limitations are made here.

[0039] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A battery, characterized in that, include: The device includes a housing, a battery cell, a base plate, and an explosion-proof valve. The bottom surface of the housing has a vent, which is covered by the explosion-proof valve. The battery cell and the base plate are disposed inside the housing, and the base plate is disposed between the battery cell and the vent. The base plate has a body and a support portion. The support portion is located between the bottom surface of the body and the outer shell, and the support portion is offset from the exhaust port. The ratio of the area of ​​the support portion projected onto the body to the area of ​​the body is 50% to 90%.

2. The battery as described in claim 1, characterized in that, The support portion is provided in multiple parts, and at least some of the support portions are arranged around and at intervals along the exhaust port.

3. The battery as described in claim 1, characterized in that, The support portion is provided at least once, and at least a portion of the support portion is arranged continuously around the exhaust port.

4. The battery as described in claim 3, characterized in that, The support portion arranged continuously around and around the exhaust port is a first support portion. The first support portion has a first surface and a second surface that are opposite to each other. The first surface faces the exhaust port and the second surface is away from the exhaust port. The first support portion has a first air channel connecting the first surface and the second surface.

5. The battery as described in claim 4, characterized in that, Along the direction from the second surface to the first surface, the first air passage is inclined toward the bottom surface of the housing.

6. The battery as claimed in claim 1, characterized in that, The body has a second air guide channel that extends along the thickness direction of the body.

7. The battery as claimed in claim 1, characterized in that, The height of the support portion is 0.5mm to 2mm.

8. The battery as claimed in claim 1, characterized in that, The length of the support portion is 50mm to 180mm.

9. The battery according to any one of claims 1-8, characterized in that, The main body and the support are integrally formed.

10. A battery pack, characterized in that, include: The housing and the battery as described in any one of claims 1-9, wherein the battery is disposed within the housing.

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