A single battery and a battery pack

Abstract

This application provides a single-cell battery and a battery pack. The single-cell battery includes a cell, a casing, an explosion-proof valve, terminals, and a cell support plate. The terminals are disposed on a first side wall of the casing, and the explosion-proof valve is disposed on a second side wall of the casing. The first and second side walls are located on different sides of the casing. The cell is located inside the casing, and the cell support plate is located between the cell and the second side wall. The cell support plate includes a first support portion and at least one second support portion. Along the length direction of the cell support plate, the second support portion and the first support portion are arranged sequentially. The orthographic projection of the first support portion on the second side wall at least partially overlaps with the explosion-proof valve, and the orthographic projection of the second support portion on the second side wall is offset from the explosion-proof valve. The maximum thickness of the second support portion is greater than the maximum thickness of the first support portion. This single-cell battery has high safety in the event of thermal runaway.

Description

Technical Field

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

[0002] The side wall of the battery casing is equipped with an explosion-proof valve and a terminal post. A support is usually installed between the battery cell and the side wall of the casing where the explosion-proof valve is located. The support supports the battery cell so that it is not in close contact with the explosion-proof valve. This is to prevent the battery cell from blocking the explosion-proof valve in the event of thermal runaway, thus ensuring the smooth opening of the explosion-proof valve.

[0003] In traditional systems, the explosion-proof valve and the terminal post are located on the same side of the casing. Because the terminal post is on this side, the connection point between the cell and the terminal post is also at least partially located on the terminal post side. This results in the flatness of the inner wall of the casing on this side being less than that of the inner wall of other casings. In this case, the cell is less likely to clog the explosion-proof valve during battery thermal runaway. However, when the terminal post is not on the same side as the explosion-proof valve, the inner wall of the casing on the side of the explosion-proof valve is relatively flat, and the explosion-proof valve is more likely to be clogged by the cell during battery thermal runaway, affecting the safety of the individual battery during thermal runaway.

[0004] Therefore, when the terminals and the explosion-proof valve are not on the same side, how to improve the safety of a single battery cell during thermal runaway is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] To solve the above-mentioned technical problems, this application provides a single battery cell, which includes a cell, a casing, an explosion-proof valve, terminals, and a cell support plate. The terminals are disposed on a first side wall of the casing, and the explosion-proof valve is disposed on a second side wall of the casing. The first side wall and the second side wall are located on different sides of the casing. The cell is located inside the casing, and the cell support plate is located between the cell and the second side wall.

[0006] The battery cell tray includes a first support portion and at least one second support portion. The second support portion and the first support portion are arranged sequentially along the length direction of the battery cell tray. The orthographic projection of the first support portion on the second side wall at least partially overlaps with the explosion-proof valve. The orthographic projection of the second support portion on the second side wall is offset from the explosion-proof valve. The maximum thickness of the second support portion is greater than the maximum thickness of the first support portion.

[0007] This application also provides a battery pack, the battery pack including a base plate and the aforementioned individual battery cells, the individual battery cells being located on the base plate, and the explosion-proof valve of the individual battery cells facing the base plate.

[0008] In the aforementioned single-cell battery, because the maximum thickness of the second support portion is greater than that of the first support portion, the thermal conduction speed in the thickest area of ​​the second support portion is slower. Therefore, in the event of thermal runaway, the thickest area of ​​the second support portion is less likely to melt, thus reliably supporting the cell between the cell and the second sidewall of the casing. This avoids the problem of the cell support plate failing, causing the cell to adhere tightly to the explosion-proof valve, affecting the smooth opening of the explosion-proof valve, and hindering the rapid discharge of high-temperature gas. Simultaneously, the greater thickness of the second support portion creates a gap between the first support portion and the second sidewall of the cell and / or the casing. This gap increases the flow space for high-temperature gas during thermal runaway, further facilitating the rapid discharge of high-temperature gas. Therefore, the aforementioned single-cell battery offers high safety during thermal runaway. Attached Figure Description

[0009] Figure 1 A perspective view of a single-cell battery provided in this application;

[0010] Figure 2 for Figure 1 Another perspective view;

[0011] Figure 3 Figure 1 Cross-sectional view;

[0012] Figure 4 for Figure 3 A magnified view of a portion of the image;

[0013] Figure 5 for Figure 1 Exploded view;

[0014] Figure 6 for Figure 1 A 3D view of the battery cell tray;

[0015] Figure 7 for Figure 6 Another perspective view;

[0016] Figure 8 for Figure 6 Floor plan;

[0017] Figure 9 for Figure 8 A magnified view of a portion of the image.

[0018] The annotations in the attached figures are explained as follows:

[0019] 100 Casing, 101 First sidewall, 102 Second sidewall;

[0020] 200 poles;

[0021] 300 explosion-proof valve;

[0022] 400 battery cell, 401 battery cell body, 402 electrode tab;

[0023] 500 Cell support plate, 501 First support part, 501a First flat plate, 501b Through hole, 502 Second support part, 502a Second flat plate, 502b Protrusion, 503 First reinforcing rib, 504 Second reinforcing rib, 505 Groove. Detailed Implementation

[0024] This application provides a single-cell battery. To enable those skilled in the art to better understand the technical solution of this application, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0025] like Figures 1-5 As shown, the single battery provided in this application includes a cell 400, a casing 100, an explosion-proof valve 300, a terminal post 200, and a cell support plate 500.

[0026] The battery cell 400 is the smallest unit for charging and discharging a single battery cell. Cell 400 includes a positive electrode, a negative electrode, a separator, a positive tab, and a negative tab. The separator is located between the positive and negative electrode and can be made of polyethylene, polypropylene, etc. The positive tab extends from the positive electrode. The positive electrode includes the positive active material, which can be lithium iron phosphate, lithium nickel cobalt manganese oxide, lithium nickel manganese oxide, lithium manganese iron phosphate, etc. The negative tab extends from the negative electrode. The negative electrode includes the negative active material, which can be graphite, silicon, soft carbon, hard carbon, etc.

[0027] The electrode post 200 is disposed on the first side wall 101 of the housing 100 and is used to connect the positive and negative tabs of the cell 400 to the current-collecting components other than the individual battery. The explosion-proof valve 300 is disposed on the second side wall 102 of the housing 100 and is used to prevent the individual battery from exploding due to abnormal internal pressure increase or short circuit, thereby ensuring the safe operation of the individual battery. The first side wall 101 and the second side wall 102 are disposed on different sides of the housing 100. In the figure, the first side wall 101 and the second side wall 102 are two side walls of the housing 100 that are arranged opposite each other. More specifically, in the figure, the housing 100 is a rectangular housing with two large-area side walls, two small-area side walls located on both sides of the length direction of the two large-area side walls, and two small-area side walls located on both sides of the width direction of the two large-area side walls. The first side wall 101 and the second side wall 102 are two small-area side walls located on both sides of the width direction of the two large-area side walls. Alternatively, the first side wall 101 and the second side wall 102 can also be two side walls of the housing 100 that are arranged adjacent to each other.

[0028] The battery cell 400 is located inside the housing 100, and the battery cell support plate 500 is located between the battery cell 400 and the second side wall 102. The battery cell support plate 500 supports the battery cell 400 away from the second side wall 102, so that the battery cell 400 is not in close contact with the explosion-proof valve 300 on the second side wall 102. In other words, there is a gap between the battery cell 400 and the explosion-proof valve 300.

[0029] like Figure 5 As shown, the battery cell tray 500 includes a first tray 501 and at least one second tray 502. The second tray 502 and the first tray 501 are arranged sequentially along the length of the battery cell tray 500. In the figure, two second trays 502 are provided, located on either side of the first tray 501; however, more than two second trays 502 can also be provided. The orthographic projection of the first tray 501 on the second side wall 102 at least partially overlaps with the explosion-proof valve 300. The orthographic projection of the second tray 502 on the second side wall 102 is offset from the explosion-proof valve 300; that is, the orthographic projection of the second tray 502 on the second side wall 102 does not overlap with the explosion-proof valve 300. Figure 8 As shown, the maximum thickness H2 of the second support portion 502 is greater than the maximum thickness H1 of the first support portion 501.

[0030] When the terminal post 200 and the explosion-proof valve 300 are located on different side walls of the housing 100, during thermal runaway, the high-temperature airflow needs to bypass the cell 400 to reach the location of the explosion-proof valve 300, resulting in a relatively slow exhaust speed of the high-temperature airflow. This leads to a higher temperature inside the housing 100, which makes the cell support plate 500 more susceptible to support failure. Once the support fails, the cell 400 may come into close contact with the explosion-proof valve 300, which will affect the smooth opening of the explosion-proof valve 300 and hinder the rapid exhaust of the high-temperature airflow from the opened explosion-proof valve 300. This results in a lower safety level for the individual battery during thermal runaway.

[0031] In the aforementioned single-cell battery, because the maximum thickness of the second support portion 502 is greater than the maximum thickness of the first support portion 501, the heat conduction speed in the maximum thickness area of ​​the second support portion 502 is slower. Therefore, in the event of thermal runaway, the maximum thickness area of ​​the second support portion 502 is less likely to melt, thus reliably supporting the cell 400 between the cell support plate 500 and the second side wall 102 of the casing 100. This avoids the problem of the cell 400 being pressed against the explosion-proof valve 300 due to support failure, which would affect the smooth opening of the explosion-proof valve 300 and hinder the rapid discharge of high-temperature airflow. Simultaneously, the greater maximum thickness of the second support portion 502 than the first support portion 501 creates a gap between the first support portion 501 and the cell 400 and / or the second side wall 102 of the casing 100. This gap increases the flow space for high-temperature airflow during thermal runaway, further facilitating the rapid discharge of high-temperature airflow. Therefore, the aforementioned single-cell battery exhibits high safety during thermal runaway.

[0032] The difference between the maximum thickness of the second support portion 502 and the maximum thickness of the first support portion 501 is defined as A, that is, A is equal to the maximum thickness H2 of the second support portion 502 minus the maximum thickness H1 of the first support portion 501. In some embodiments, the range of A is: 0.4mm ≤ A ≤ 1.5mm, for example, A can be equal to 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, or 1.5mm.

[0033] If A is too large, it means that the maximum thickness H1 of the first support portion 501 is too small or the maximum thickness H2 of the second support portion 502 is too large. If the maximum thickness H1 of the first support portion 501 is too small, it will easily melt or detach during thermal runaway, potentially affecting the smooth opening of the explosion-proof valve 300 and compromising the safety of the cell during thermal runaway. If the maximum thickness H2 of the second support portion 502 is too large, it will result in low energy density of the individual cell. Controlling A within the specified range ensures the safety of the individual cell during thermal runaway and guarantees a high energy density for the individual cell.

[0034] In some embodiments, such as Figure 6 As shown, the second support portion 502 includes a second flat plate 502a and a protrusion 502b protruding from the second flat plate 502a. The area where the protrusion 502b is provided becomes the area of ​​maximum thickness of the second support portion 502. (Combined with...) Figure 8 In other words, the maximum thickness H2 of the second support portion 502 is equal to the sum of the thickness H of the protrusion 502b protruding from the second plate 502a and the thickness of the second plate 502a. This design creates a gap between the second plate 502a and the second sidewall 102 of the housing 100 and / or the cell 400. This gap increases the flow space for high-temperature airflow during thermal runaway, facilitating the rapid discharge of high-temperature airflow and further improving the safety of the single battery cell during thermal runaway.

[0035] Specifically, all protrusions 502b can be disposed on the side of the second plate 502a facing the second sidewall 102 of the housing 100. That is, the protrusions 502b protrude from the second plate 502a toward the second sidewall 102 of the housing 100, as is the case in the illustrated embodiment. In this case, a gap for high-temperature airflow is formed between the cell support plate 500 and the second sidewall 102 of the housing 100.

[0036] Alternatively, all protrusions 502b can be disposed on the side of the second plate 502a facing the cell 400, that is, the protrusions 502b protrude from the second plate 502a toward the cell 400. In this case, a gap is formed between the cell support plate 500 and the cell 400 for the flow of high-temperature airflow.

[0037] Alternatively, a portion of the protrusion 502b may be disposed on the side of the second plate 502a facing the second sidewall 102 of the housing 100, and a portion of the protrusion 502b may be disposed on the side of the second plate 502a facing the cell 400. In this case, a gap for high-temperature airflow is formed between the cell support plate 500 and the second sidewall 102 of the housing 100, and a gap for high-temperature airflow is also formed between the cell support plate 500 and the cell 400.

[0038] In some embodiments, the cell tray 500 is a one-piece structure. That is, the cell tray 500 is formed as a single piece.

[0039] In some embodiments, such as Figure 6 As shown, the first support portion 501 includes a first flat plate 501a. One side of the first flat plate 501a in the thickness direction and one side of the second flat plate 502a in the thickness direction are on the same plane. The other side of the first flat plate 501a in the thickness direction and the other side of the second flat plate 502a in the thickness direction are on the same plane. This makes it easier to integrally form the battery cell support plate 500.

[0040] In some embodiments, each second support portion 502 is provided with a plurality of (two or more) protrusions 502b spaced apart along the length of the cell support plate 500. In this way, multiple different positions of the cell 400 can be supported on the second sidewall 102 of the housing 100 by the multiple protrusions 502b, ensuring the stability of the cell 400. Moreover, the gaps formed between adjacent protrusions 502b increase the flow space of high-temperature airflow in the event of thermal runaway, which is more conducive to the rapid discharge of high-temperature airflow, thereby better ensuring the safety of the single cell in the event of thermal runaway.

[0041] Specifically, in the illustrated embodiments, such as Figure 6 As shown, each second support portion 502 is provided with two rows of protrusions 502b. These two rows of protrusions 502b are respectively provided on both sides of the width direction of the cell support plate 500. There are two protrusions 502b in each row, and the two protrusions 502b in each row are arranged alternately in the length direction of the cell support plate 500.

[0042] Specifically, in the illustrated embodiments, such as Figure 6 As shown, the two second support portions 502 are symmetrical about the first support portion 501. This can better support the battery cell 400, improve the stability of the battery cell 400, and facilitate the integral molding of the battery cell support plate 500.

[0043] Preferred, such as Figure 6As shown, the range of the distance B between adjacent protrusions 502b of each second support portion 502 in the length direction of the cell support plate 500 is: 1mm≤B≤5mm. For example, B can be equal to 1mm, 2mm, 3mm, 4mm, or 5mm.

[0044] With a fixed length of cell support plate 500, if the spacing B is too large, the number of protrusions 502b along the length of cell support plate 500 will be insufficient, resulting in poor support for cell 400 and consequently, poor stability of cell 400. If the spacing B is too small, the gap between adjacent protrusions 502b will be too small, making it difficult for high-temperature airflow to pass through, hindering the rapid discharge of high-temperature airflow and thus compromising safety during thermal runaway of a single cell. Controlling the spacing B within a certain range can balance the stability of cell 400 and the safety during thermal runaway of a single cell.

[0045] In some embodiments, such as Figure 6 As shown, each second support portion 502 has a protrusion 502b centered in the width direction of the cell support plate 500 at one end away from the first support portion 501. This design allows gaps to be formed between the two ends of the cell support plate 500 in the length direction and the second side wall 102 of the housing 100 and / or the cell 400. High-temperature airflow can flow through these gaps to the location of the explosion-proof valve 300, which is more conducive to the rapid discharge of high-temperature airflow, thereby improving the safety of the single cell in the event of thermal runaway, and also improving the stability of the cell.

[0046] In some embodiments, such as Figure 9 As shown, the height H of the protrusion 502b protruding from the second plate 502a is in the range of 0.4mm ≤ H ≤ 1.0mm. For example, H can be equal to 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1.0mm. If the height H of the protrusion 502b protruding from the second plate 502a is too large, the maximum thickness H2 of the second support portion 502 will be too large, resulting in a lower energy density of the single battery cell and making the protrusion 502b prone to bending. If the height of the protrusion 502b protruding from the second plate 502a is too small, the maximum thickness H2 of the second support portion 502 will be too small, resulting in a smaller gap between the cell support plate 500 and the second side wall 102 of the cell 400 and / or the casing 100, which is not conducive to the rapid discharge of high-temperature gases and thus is detrimental to the safety of the single battery cell in the event of thermal runaway. By controlling the height H of the protrusion 502b protruding from the second plate 502a within a certain range, the energy density of the single cell, the rigidity of the protrusion 502b, and the safety of the single cell in the event of thermal runaway can be balanced.

[0047] In some embodiments, such as Figure 6As shown, the first support portion 501 is provided with a plurality of through holes 501b. The ratio C of the projected area of ​​all through holes 501b on the second side wall 102 to the projected area C of the battery cell support plate 500 on the second side wall 102 is in the range of 8%≤C≤40%. For example, C can be equal to 8%, 15%, 20%, 25%, 30%, 35%, or 40%. In this case, the range of the height H of the protrusion 502b protruding from the second plate 502a can be further limited to 0.4mm≤H≤0.9mm. For example, H can be equal to 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, or 0.9mm.

[0048] If the proportion C of the projected area of ​​all through holes 501b on the second side wall 102 to the projected area C of the cell support plate 500 on the second side wall 102 is too large, the cell support plate 500 will easily break off from the first support portion 501. Breaking off will reduce the support of the cell support plate 500 for the cell 400, which is detrimental to the stability of the cell 400. If C is too small, the high-temperature airflow will not be able to quickly pass through the through holes 501b and exit from the explosion-proof valve 300 during thermal runaway, which is detrimental to the safety of a single battery during thermal runaway. Controlling C within the range of -1 / 2 can balance the stability of the cell 400 and the safety of a single battery during thermal runaway. When C is within the above range, the high-temperature airflow can pass through the through hole 501b and be discharged from the explosion-proof valve 300 relatively quickly during thermal runaway. At this time, the gap between the cell support plate 500 and the second side wall 102 of the cell 400 and / or the housing 100 for the flow of high-temperature airflow can be reduced. Therefore, the upper limit of the range of the height H of the protrusion 502b protruding from the second plate 502a can be reduced.

[0049] Specifically, the first support portion 501 can have multiple small through holes evenly distributed on it, so that the high-temperature airflow can pass through each small through hole 501b in a dispersed manner, which is more conducive to the rapid discharge of the high-temperature airflow. Alternatively, the first support portion 501 can also have only one large through hole.

[0050] In some embodiments, such as Figure 7 As shown, the second plate 502a has a groove 505 formed on the back side of the protrusion 502b. A high-temperature resistant component (not shown in the figure) is provided in the groove 505. The melting point of the high-temperature resistant component is greater than the melting point of the cell support plate 500.

[0051] If thermal runaway causes the temperature inside the casing 100 to become too high, there is an extreme situation where the thickest part of the second support portion 502 of the cell support plate 500 may also melt. In this case, because a high-temperature resistant component is provided, and the melting point of the high-temperature resistant component is higher than that of the cell support plate 500, the high-temperature resistant component can still reliably support the cell 400 and the second side wall 102 of the casing 100. This ensures that the cell 400 will not stick to the explosion-proof valve 300 in such an extreme situation, thus affecting the smooth opening of the explosion-proof valve 300 and hindering the rapid discharge of high-temperature airflow. Therefore, it can further improve the safety of a single battery during thermal runaway.

[0052] Specifically, high-temperature resistant components can be made of ceramics, metals, or mica, etc.

[0053] Specifically, the battery cell tray 500 can be made of plastic.

[0054] Specifically, the high-temperature resistant component and the cell tray 500 can be integrally molded. For example, the high-temperature resistant component can be pre-embedded in the injection mold during the injection molding of the cell tray 500. Alternatively, the high-temperature resistant component and the cell tray 500 can also be assembled and fixed. For example, they can be interference-fitted into the groove 505 of the cell tray 500.

[0055] In some embodiments, the cell tray 500 includes reinforcing ribs to enhance its strength. Specifically, the reinforcing ribs may be disposed on one or both sides of the cell tray 500 in the thickness direction.

[0056] Specifically, in the illustrated embodiments, such as Figure 6 As shown, the reinforcing rib includes a first reinforcing rib 503 extending along the width direction of the cell tray 500 and a second reinforcing rib 504 extending along the length direction of the cell tray 500. In the figure, the first reinforcing rib 503 is disposed on one side of the first flat plate 501a of the first support portion 501 in the thickness direction, and the second reinforcing rib 504 is disposed on one side of the cell tray 500 in the thickness direction, extending from one end of the cell tray 500 in the length direction to the other end of the cell tray 500 in the length direction.

[0057] Specifically, the reinforcing ribs and protrusions 502b can be disposed on the same side or different sides of the thickness direction of the cell support plate 500. When disposed on the same side, such as... Figure 9 As shown, the protrusion height H3 of the reinforcing rib is less than the protrusion height H of the protrusion 502b.

[0058] The battery pack provided in this application includes a base plate and the aforementioned individual battery cells. The individual battery cells are located on the base plate, and the explosion-proof valve 300 of the individual battery cells faces the base plate. The base plate is used to support the individual battery cells, and the material of the base plate can be aluminum, iron, stainless steel, aluminum alloy, etc.

[0059] The above examples illustrate the principles and implementation methods of this application. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A single-cell battery, characterized in that, The single battery includes a cell (400), a housing (100), an explosion-proof valve (300), a terminal post (200), and a cell support plate (500). The terminal post (200) is disposed on the first side wall (101) of the housing (100), and the explosion-proof valve (300) is disposed on the second side wall (102) of the housing (100). The first side wall (101) and the second side wall (102) are located on different sides of the housing (100). The cell (400) is located inside the housing (100), and the cell support plate (500) is located between the cell (400) and the second side wall (102). The battery cell tray (500) includes a first tray (501) and at least one second tray (502). In the length direction of the battery cell tray (500), the second tray (502) and the first tray (501) are arranged in sequence. The orthographic projection of the first tray (501) on the second side wall (102) at least partially overlaps with the explosion-proof valve (300). The orthographic projection of the second tray (502) on the second side wall (102) is offset from the explosion-proof valve (300). The maximum thickness of the second tray (502) is greater than the maximum thickness of the first tray (501).

2. The cell according to claim 1, wherein The difference A between the maximum thickness of the second support (502) and the maximum thickness of the first support (501) is in the range of 0.4mm≤A≤1.5mm.

3. The cell according to claim 1 or 2, characterized in that, The second support (502) includes a second flat plate (502a) and a protrusion (502b) protruding from the second flat plate (502a), and the area where the protrusion (502b) is provided becomes the maximum thickness area of ​​the second support (502).

4. The cell according to claim 3, wherein All of the protrusions (502b) are provided on the side of the second plate (502a) facing the second sidewall (102); Alternatively, all of the protrusions (502b) may be disposed on the side of the second plate (502a) facing the cell (400); Alternatively, some of the protrusions (502b) may be disposed on the side of the second plate (502a) facing the second sidewall (102), and some of the protrusions (502b) may be disposed on the side of the second plate (502a) facing the cell (400).

5. The cell according to claim 3, wherein Each of the second support portions (502) has a plurality of protrusions (502b) arranged sequentially at intervals along the length direction of the cell support plate (500).

6. The cell according to claim 5, wherein In the length direction of the cell support plate (500), the distance B between adjacent protrusions (502b) of each second support portion (502) is in the range of 1mm≤B≤5mm.

7. The cell according to claim 3, wherein Each of the second support portions (502) has a protrusion (502b) centered in the width direction of the cell support plate (500) at one end away from the first support portion (501).

8. The single-cell battery according to claim 3, characterized in that, The height H of the protrusion (502b) protruding from the second plate (502a) is in the range of 0.4mm≤H≤1.0mm.

9. The cell according to claim 3, wherein The first support (501) is provided with a plurality of through holes (501b). The ratio C of the positive projection area of ​​all the through holes (501b) on the second side wall (102) to the positive projection area of ​​the battery cell support plate (500) on the second side wall (102) is in the range of 8%≤C≤40%. The height H of the protrusion (502b) protruding from the second plate (502a) is in the range of 0.4mm≤H≤0.9mm.

10. The cell according to claim 3, wherein The second plate (502a) has a groove (505) formed on the back side of the protrusion (502b) position. A high-temperature resistant component is provided in the groove (505), and the melting point of the high-temperature resistant component is greater than the melting point of the battery cell support plate (500).

11. A battery pack, characterized by The battery pack includes a base plate and a single battery cell as described in any one of claims 1-10, the single battery cell being located on the base plate, and the explosion-proof valve (300) of the single battery cell facing the base plate.

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