Single cell battery and battery pack

Abstract

A single-cell battery, characterized in that the single-cell battery comprises an electrical core (400), a housing (100), an explosion protection valve (300), an electrode column (200) and a core support plate (500); wherein the electrode column (200) is provided on a first side wall (101) of the housing (100), wherein the explosion protection valve (300) is provided on a second side wall (102) of the housing (100); wherein the first side wall (101) and the second side wall (102) are located on different sides of the housing (100), wherein the electrical core (400) is located inside the housing (100), and wherein the core support plate (500) is located between the electrical core (400) and the second side wall (102);wherein the core support plate (500) comprises a first support section (501) and at least one second support section (502), wherein the second support section (502) and the first support section (501) are arranged successively along a longitudinal direction of the core support plate (500); wherein the orthogonal projection of the first support section (501) onto the second side wall (102) overlaps at least a portion of the explosion protection valve (300), while the orthogonal projection of the second support section (502) onto the second side wall (102) is offset from the explosion protection valve (300); wherein the maximum thickness of the second support section (502) is greater than the maximum thickness of the first support section (501).

Description

Technical field

[0001] The present application relates to the technical field of batteries, in particular a single-cell battery and a battery pack. Technical background

[0002] The side wall of the single-cell battery housing is equipped with an explosion protection valve and an electrode stack. A support element is typically provided between the electrical core of the single-cell battery and the housing side wall where the explosion protection valve is located. This support element supports the electrical core and prevents it from directly contacting the explosion protection valve. This arrangement prevents the electrical core from blocking the explosion protection valve during thermal runaway, thus ensuring the smooth opening of the valve.

[0003] In the traditional arrangement, the explosion protection valve is located on the same side of the casing as the electrode column. Because the electrode column is positioned on this side, the connection point between the electrical core and the electrode column must also be at least partially located on the side of the electrode column. This results in a less smooth inner wall of the casing on this side compared to the inner walls of the other casings. Consequently, it is less likely that the electrical core will block the explosion protection valve during a thermal runaway of the battery. However, if the electrode column is not located on the same side as the explosion protection valve, the inner wall of the casing on the side with the explosion protection valve is relatively smooth.In this way, the electrical core can block the explosion protection valve during a thermal runaway of the battery, compromising the safety of the single-cell battery during thermal runaway.

[0004] In light of this, improving the safety of the single-cell battery during a thermal runaway of the battery, when the electrode column and the explosion protection valve are not on the same side, presents a technical problem that must be solved by experts. Content of the invention

[0005] To solve the above technical problems, the present application provides a single-cell battery comprising an electrical core, a housing, an explosion protection valve, an electrode column, and a core support plate; wherein the electrode column is provided on a first side wall of the housing, and the explosion protection valve is provided on a second side wall of the housing; wherein the first side wall and the second side wall are located on opposite sides of the housing, and wherein the electrical core is located inside the housing, and the core support plate is located between the electrical core and the second side wall;

[0006] wherein the core support plate comprises a first support section and at least one second support section, wherein the second support section and the first support section are arranged successively along a longitudinal direction of the core support plate; wherein the orthogonal projection of the first support section onto the second side wall overlaps at least a portion of the explosion protection valve, while the orthogonal projection of the second support section onto the second side wall is offset from the explosion protection valve; wherein the maximum thickness of the second support section is greater than the maximum thickness of the first support section.

[0007] The present application further provides a battery pack, wherein the battery pack comprises a base plate and a single-cell battery above, wherein the single-cell battery is located on the base plate, and the explosion protection valve of the single-cell battery faces the base plate.

[0008] Since the maximum thickness of the second support section in the above single-cell battery is greater than the maximum thickness of the first support section, the heat conduction rate within the area of ​​maximum second support section thickness is lower. Consequently, this area of ​​maximum second support section thickness is less likely to melt during thermal runaway, thus reliably holding it in position between the electrical core and the second side wall of the casing. This prevents core support plate failure, which could cause the electrical core to come into direct contact with the explosion protection valve, hindering its smooth opening and preventing the rapid venting of hot gas.Simultaneously, a gap forms between the first support section and the electrical core or the second side wall of the casing because the maximum thickness of the second support section is greater than the maximum thickness of the first. This gap increases the flow space for the high-temperature gas during thermal runaway, thus facilitating the rapid venting of the high-temperature gas. Consequently, the single-cell battery described above exhibits improved thermal runaway safety. Images Fig. Figure 1 shows a three-dimensional representation of a single-cell battery of the present application; Fig. 2 shows a representation of Fig. 1. From a different viewpoint; Fig. Figure 3 shows a cross-sectional view of Fig. 1; Fig. Figure 4 shows a partially enlarged representation of Fig. 3; Fig. Figure 5 shows an exploded view of Fig. 1; Fig. Figure 6 shows a three-dimensional representation of a core support plate in Fig. 1; Fig. 7 shows a representation of Fig. 6 from a different perspective; Fig. Figure 8 shows a plan view of Fig. 6; Fig. Figure 9 shows a partially enlarged representation of Fig. 8. Reference symbol list:

[0009] 100 Housing, 101 first side panel, 102 second side panel; 200 electrode columns; 300 explosion protection valve; 400 electrical core, 401 core body, 402 electrode tab; 500 Core support plate; 501 First support section; 501a First flat plate; 501b Through hole; 502 Second support section; 502a Second flat plate; 502b Projection section; 503 First reinforcing bar; 504 Second reinforcing bar; 505 Recess. Description of embodiments

[0010] The present application provides a single-cell battery. To enable the person skilled in the art to better understand the technical solution of the present application, a detailed description of the present application follows, in conjunction with the attached drawings and specific embodiments.

[0011] As in the Fig. As shown in Figures 1 to 5, the single-cell battery described in the present application comprises an electrical core 400, a housing 100, an explosion protection valve 300, an electrode column 200 and a core support plate 500.

[0012] The electrical core 400 is the smallest unit for charging and discharging the single-cell battery and comprises a cathode foil, an anode foil, a separator, a cathode tab, and an anode tab. The separator is located between the cathode foil and the anode foil and can be made of materials such as polyethylene or polypropylene. The cathode tab extends from the cathode foil. The cathode foil contains an active cathode material, which can include lithium iron phosphate, lithium nickel cobalt manganese oxide, lithium manganese oxide, or lithium iron phosphate manganese oxide. The anode tab extends from the anode foil. The anode foil contains an active anode material, which can include graphite, silicon, soft carbon, or hard carbon.

[0013] The electrode column 200 is provided on the first side wall 101 of the housing 100 and serves to connect the cathode and anode tabs of the electrical core 400 to the other current collection components besides the single-cell battery. The explosion protection valve 300 is provided on the second side wall 102 of the housing 100. It prevents the single-cell battery from exploding due to abnormal internal pressure increases or short circuits, thus ensuring the safe operation of the single-cell battery. The first side wall 101 and the second side wall 102 are located on opposite sides of the housing 100. In the figures, the first side wall 101 and the second side wall 102 are two side walls of the housing 100 that are arranged relatively opposite each other.More precisely, the housing 100 depicted in the figures is a rectangular housing comprising two large side walls, two small side walls located on both sides along the longitudinal direction of the two large side walls, and two small side walls located on both sides along the transverse direction of the two large side walls. The first side wall 101 and the second side wall 102 are two small side walls located on both sides along the transverse direction of the two large side walls. Alternatively, the first side wall 101 and the second side wall 102 can also be two adjacent side walls of the housing 100.

[0014] The electrical core 400 is located inside the housing 100, with the core support plate 500 situated between the electrical core 400 and the second side wall 102. The core support plate 500 supports the electrical core 400 away from the second side wall 102, thus preventing the electrical core 400 from directly contacting the explosion protection valve 300 on the second side wall 102. That is, there is a gap between the electrical core 400 and the explosion protection valve 300.

[0015] As in Fig. As shown in Figure 5, the core support plate 500 comprises a first support section 501 and at least one second support section 502. Along the longitudinal direction of the core support plate 500, the second support section 502 and the first support section 501 are arranged sequentially. In the figures, two second support sections 502 are provided, and the two second support sections 502 are provided on both sides of the first support section 501. Of course, more than two second support sections 502 can also be provided. The orthogonal projection of the first support section 501 onto the second side wall 102 overlaps at least part of the explosion protection valve 300. The orthogonal projection of the second support section 502 onto the second side wall 102 is offset from the explosion protection valve 300; that is, the orthogonal projection of the second support section 502 onto the second side wall 102 does not overlap the explosion protection valve 300. As shown in Fig. As shown in Figure 8, the maximum thickness H2 of the second support section 502 is greater than the maximum thickness H1 of the first support section 501.

[0016] If the electrode column 200 and the explosion protection valve 300 are located on different side walls of the housing 100, the high-temperature gas flow during thermal runaway must bypass the electrical core 400 to reach the position of the explosion protection valve 300. This results in a relatively slow discharge of the high-temperature gas flow, leading to increased temperatures inside the housing 100 and thus increasing the risk of core support plate 500 failure. Should the support plate fail, the electrical core 400 can come into direct contact with the explosion protection valve 300. This hinders the smooth opening of the explosion protection valve 300 and prevents the rapid discharge of high-temperature gas through the open explosion protection valve 300, thereby compromising the safety of the single-cell battery during thermal runaway.

[0017] Since the maximum thickness of the second support section 502 in the above single-cell battery is greater than the maximum thickness of the first support section 501, the heat conduction rate within the area of ​​maximum thickness of the second support section 502 is lower. Consequently, this area of ​​maximum thickness of the second support section 502 is less likely to melt during thermal runaway, thus reliably holding it in position between the electrical core 400 and the second side wall 102 of the housing 100. This prevents failure of the core support plate 500, which could cause the electrical core 400 to come into direct contact with the explosion protection valve 300, hindering its smooth opening and preventing the rapid venting of hot gas.Simultaneously, a gap forms between the first support section 501 and the electrical core 400 or the second side wall 102 of the casing 100, because the maximum thickness of the second support section 502 is greater than the maximum thickness of the first support section 501. This gap increases the flow space for the high-temperature gas during thermal runaway, thus facilitating the rapid venting of the high-temperature gas. Consequently, the above single-cell battery exhibits improved thermal runaway safety.

[0018] The difference between the maximum thickness of the second support section 502 and the maximum thickness of the first support section 501 is defined as A, where A is the maximum thickness H2 of the second support section 502 minus the maximum thickness H1 of the first support section 501. In some embodiments, the range of A is 0.4 mm ≤ A ≤ 1.5 mm. For example, A can be 0.4 mm, 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm, or 1.5 mm.

[0019] If A is too large, this means that either the maximum thickness H1 of the first support section 501 is too small or the maximum thickness H2 of the second support section 502 is too large. An insufficient maximum thickness H1 of the first support section 501 can cause it to melt or detach during a thermal runaway, which can impede the smooth opening of the explosion protection valve 300 and compromise the safety of the single-cell battery during a thermal runaway. An excessive maximum thickness H2 of the second support section 502 can result in a low energy density for the single-cell battery. Controlling A within the range of 0.4 mm to 1.5 mm ensures both the safety of the single-cell battery during a thermal runaway and a high energy density for the single-cell battery.

[0020] In some embodiments, such as in Fig. As shown in Figure 6, the second support section 502 comprises a second flat plate 502a) and a projecting section 502b extending from the second flat plate 502a, the area in which the projecting section 502b is provided forming the area of ​​maximum thickness of the second support section 502. As shown in Fig. As shown in Figure 8, the maximum thickness H2 of the second support section 502 corresponds to the sum of the thickness H by which the projecting section 502b extends from the second flat plate 502a and the thickness of the second flat plate 502a itself. This creates a gap between the second flat plate 502a and either the second side wall 102 of the housing 100 and / or the electrical core 400. This gap increases the flow space for high-temperature gas during a thermal runaway, facilitating the rapid dissipation of hot gas and thus further enhancing the safety of the single-cell battery during a thermal runaway.

[0021] In particular, all projecting sections 502b can be provided on the side of the second flat plate 502a facing the second side wall 102 of the housing 100. That is, the projecting sections 502b extend in a direction from the second flat plate 502a to the second side wall 102 of the housing 100, as shown in the exemplary embodiment. In this case, a gap is formed for the passage of high-temperature gas between the core support plate 500 and the second side wall 102 of the housing 100.

[0022] Alternatively, all projecting sections 502b can be provided on the side of the second flat plate 502a facing the electrical core 400, i.e., the projecting sections 502b extend in the direction from the second flat plate 502a to the electrical core 400. In this case, a gap is formed for the passage of high-temperature gas between the core support plate 500 and the electrical core 400.

[0023] Alternatively, part of the projecting sections 502b can be provided on one of the sides of the second flat plate 502a facing the second side wall 102 of the housing 100, while part of the projecting sections 502b is provided on the side of the second flat plate 502a facing the electrical core 400. In this case, a gap for the passage of high-temperature gas is formed between the core support plate 500 and the second side wall 102 of the housing 100. Simultaneously, a gap for the passage of high-temperature gas is formed between the core support plate 500 and the electrical core 400.

[0024] In some embodiments, the core support plate 500 is a one-piece structure. That is, the core support plate 500 is formed as a single piece.

[0025] In some embodiments, such as in Fig. As shown in Figure 6, the first support section 501 comprises a first flat plate 501a, wherein one side of the first flat plate 501a and one side of the second flat plate 502a form the same plane in the thickness direction. The other side of the first flat plate 501a and the other side of the second flat plate 502a form the same plane in the thickness direction, thus facilitating the one-piece forming of the core support plate 500.

[0026] In some embodiments, a plurality of projecting sections 502b (two or more than two) are provided sequentially spaced at intervals along the longitudinal direction of the core support plate 500 on every second support section 502. In this way, several different positions of the electrical core 400 can be supported by respective projecting sections 502b on the second side wall 102 of the housing 100, thus ensuring the stability of the electrical core 400. Furthermore, gaps are formed between adjacent projecting sections 502b. This gap increases the flow space for high-temperature gas during thermal runaway, which facilitates the rapid dissipation of hot gas and thereby ensures the safety of the single-cell battery during thermal runaway.

[0027] In particular, as in Fig. As shown in Figure 6, in the illustrated embodiment, two rows of projecting sections 502b are provided in every second support section 502. These two rows of projecting sections 502b are provided on both sides of the core support plate 500 along the width direction, with each row having two projecting sections 502b. The two projecting sections within each row are spaced apart one after the other along the length direction of the core support plate 500.

[0028] In particular, as in Fig. As shown in Figure 6, in the illustrated embodiment, the two second support sections 502 are arranged symmetrically to the first support section 501. In this way, the electrical core 400 is better supported, thereby increasing the stability of the electrical core 400, while at the same time facilitating the one-piece forming of the core support plate 500.

[0029] Preferably, as in Fig. Figure 6 shows the distance B between adjacent projection sections 502b of every second support section 502 along the longitudinal direction of the core support plate 500 in the range of 1 mm ≤ B ≤ 5 mm. For example, B can be 1 mm, 2 mm, 3 mm, 4 mm or 5 mm.

[0030] With a fixed length of the core support plate 500, an excessively large spacing B would result in fewer protruding sections 502b along the longitudinal direction of the core support plate. This would impair the supporting force for the electrical core 400 and thus adversely affect its stability. Conversely, an excessively small spacing B leads to narrow gaps between adjacent protruding sections 502b. This impedes the passage of high-temperature gas flows through these gaps, preventing rapid dissipation of the high-temperature gas and thus compromising the safety of the single-cell battery during a thermal runaway. By controlling the spacing B within the range of 1 mm to 5 mm, a balance is achieved between the stability of the electrical core 400 and the safety of the single-cell battery during a thermal runaway.

[0031] In some embodiments, such as in Fig. As shown in Figure 6, every second support section 502 is provided with one of the projecting sections 502b at its end opposite the first support section 501, in a thickness direction of the core support plate 500. This allows gaps to be formed between the ends of the core support plate 500 along its length and the second side wall 102 of the housing 100 and / or the electrical core 400. The high-temperature gas flow can thus be directed from these gaps towards the explosion protection valve 300, enabling faster discharge of the high-temperature gas. This increases the safety of the single-cell battery in the event of thermal runaway and simultaneously improves the structural integrity of the electrical core.

[0032] In some embodiments, such as in Fig. As shown in Figure 9, the height H by which the projecting section 502b protrudes from the second flat plate 502a is in the range of 0.4 mm ≤ H ≤ 1.0 mm. For example, H can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1.0 mm. If the height H by which the projecting section 502b protrudes from the second flat plate 502a is too large, this would result in an excessive maximum thickness H2 of the second support section 502. This would lead to a lower energy density for the single-cell battery and would also make the projecting section 502b prone to bending. If the height H by which the projecting section 502b protrudes from the second flat plate 502a is too small, the maximum thickness H2 of the second support section 502 will be insufficient. This results in a gap that is too small between the core support plate 500 and either the electrical core 400 and / or the second side wall 102 of the housing 100.Such a small gap hinders the rapid dissipation of high-temperature gases and thus impairs the safety of the single-cell battery in the event of thermal runaway. By controlling the height H of the projection section 502b extending from the second flat plate 502a within the range of - a balance can be achieved between the energy density of the single-cell battery, the stiffness of the projection section 502b, and the safety of the single-cell battery in the event of thermal runaway.

[0033] In some embodiments, such as in Fig. As shown in Figure 6, the first support section 501 is provided with a plurality of through holes 501b. The ratio C of the orthogonal projection area of ​​all through holes 501b on the second side wall 102 to the orthogonal projection area of ​​the core support plate 500 on the second side wall 102 is in the range of % ≤ C ≤ 40%, for example, C can be 8%, 15%, 20%, 25%, 30%, 35%, or 40%. In this case, the height H by which the projecting section 502b protrudes from the second flat plate 502a can be further limited to the range of 0.4 mm ≤ H ≤ 0.9 mm. For example, H can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, or 0.9 mm.

[0034] If the ratio C of the orthogonal projection area of ​​all through-holes 501b on the second side wall 102 to the orthogonal projection area of ​​the core support plate 500 on the second side wall 102 is too large, this can cause the core support plate 500 to detach easily from the first support section 501. Such detachment would reduce the support function of the core support plate 500 for the electrical core 400 and impair the stability of the electrical core 400. Conversely, if C is too small, the high-temperature gas generated during a thermal runaway cannot be quickly vented through the through-holes 501b from the explosion protection valve 300, which compromises the safety of the single-cell battery in the event of a thermal runaway.By controlling C within the range of -, both the stability of the electrical core 400 and the safety of the individual cell battery in the event of a thermal runaway can be ensured. If C is within the above range, the high-temperature gas flow during a thermal runaway can be discharged relatively quickly through the through-hole 501b from the explosion protection valve 300. At this point, the gap for the passage of high-temperature gas between the core support plate 500 and the electrical core 400 and / or the second side wall 102 of the housing 100 can be reduced. This allows the upper limit of the height H by which the projecting section 502b extends from the second flat plate 502a to be reduced.

[0035] In particular, a large number of small through-holes can be evenly distributed on the first support section 501. This allows the high-temperature gas flow to pass through each small through-hole 501b in a dispersed manner, further facilitating rapid discharge of the high-temperature gas flow. Alternatively, a single large through-hole can be provided on the first support section 501.

[0036] In some embodiments, such as in Fig. Figure 6 shows that the back side of the second flat plate 502a, on which the projecting section 502b is provided, forms a recess 505, wherein a high-temperature resistant element (not shown) is provided in the recess 505, wherein the melting point of the high-temperature resistant element is higher than the melting point of the core support plate 500.

[0037] Should excessively high temperatures occur within the housing 100 due to thermal runaway, an extreme situation can arise in which even the thickest part of the second support section 502 of the core support plate 500 melts. In this case, a high-temperature resistant element is provided, and the melting point of this element is higher than that of the core support plate 500. Therefore, the high-temperature resistant element can be reliably supported between the electrical core 400 and the second side wall 102 of the housing 100. This ensures that even under such extreme conditions, the electrical core 400 does not come into direct contact with the explosion protection valve 300, thus preventing any impairment of the smooth opening of the explosion protection valve and the rapid discharge of the high-temperature gas flow.This further increases the safety of the individual cell battery in the event of thermal runaway.

[0038] In particular, the high-temperature resistant element can consist of materials such as ceramic, metal or mica.

[0039] In particular, the core support plate 500 can be made of plastic.

[0040] In particular, the high-temperature-resistant element and the core support plate 500 can be formed as a single piece, for example by pre-embedding the high-temperature-resistant element in the injection mold during the injection molding of the core support plate 500. Alternatively, the high-temperature-resistant element and the core support plate 500 can be assembled and secured, for example, by press fit in the recess 505 of the core support plate 500.

[0041] In some embodiments, the core support plate 500 includes a reinforcing bar to increase its structural strength. In particular, the reinforcing bar can be provided on one or both sides of the core support plate 500 in the thickness direction.

[0042] In particular, the reinforcing bar in the illustrated embodiment comprises, as shown in Fig. Figure 6 shows a first reinforcing bar 503 extending along the width direction of the core support plate 500, and a second reinforcing bar 504 extending along the length direction of the core support plate 500. In the figures, the first reinforcing bar 503 is provided on one side of the first flat plate 501a of the first support section 501 in the thickness direction, while the second reinforcing bar 504 is provided on one side of the core support plate 500 in the thickness direction. The second reinforcing bar 504 extends continuously from one end of the core support plate 500 in the length direction to the other end of the core support plate 500 in the length direction.

[0043] In particular, the reinforcing bar and the projecting sections 502b can be positioned on the same or on different sides of the cell tray 500 in the thickness direction. When positioned on the same side, as in Fig.As shown in Figure 9, the projection height H3 of the reinforcing bar is less than the projection height H of the projection section 502b.

[0044] The present application further provides a battery pack comprising a base plate and a single-cell battery, the single-cell battery being located on the base plate, with the explosion protection valve of the single-cell battery facing the base plate. The base plate serves to support the single-cell battery, and the material of the base plate may comprise aluminum, iron, stainless steel, an aluminum alloy, or the like.

[0045] The specific examples above are used to illustrate the principles and implementation methods of the present application. The above description of the exemplary embodiments serves solely to facilitate understanding of the methods and core concepts of the present application. It should be noted that, for a person with ordinary expertise in the field, a number of improvements and embellishments can be made without derogation from the principles of the present application, and these improvements and embellishments should also be considered within the scope of protection afforded by the present application.

[0046] The embodiment of the present application provides a single-cell battery and a battery pack, wherein the single-cell battery comprises an electrical core, a housing, an explosion protection valve, an electrode column, and a core support plate; wherein the electrode column is provided on a first side wall of the housing, and the explosion protection valve is provided on a second side wall of the housing; wherein the first side wall and the second side wall are located on opposite sides of the housing, the electrical core is located inside the housing, and the core support plate is located between the electrical core and the second side wall; wherein the core support plate comprises a first support section and at least one second support section, the second support section and the first support section being arranged successively along a longitudinal direction of the core support plate;wherein the orthogonal projection of the first support section onto the second side wall overlaps at least part of the explosion protection valve, while the orthogonal projection of the second support section onto the second side wall is offset from the explosion protection valve; wherein the maximum thickness of the second support section is greater than the maximum thickness of the first support section. The above single-cell battery exhibits improved thermal runaway safety.

Claims

[1] Single-cell battery, characterized by, that the single-cell battery comprises an electrical core (400), a housing (100), an explosion protection valve (300), an electrode column (200) and a core support plate (500); wherein the electrode column (200) is provided on a first side wall (101) of the housing (100), wherein the explosion protection valve (300) is provided on a second side wall (102) of the housing (100); wherein the first side wall (101) and the second side wall (102) are located on opposite sides of the housing (100), wherein the electrical core (400) is located inside the housing (100), and wherein the core support plate (500) is located between the electrical core (400) and the second side wall (102); wherein the core support plate (500) comprises a first support section (501) and at least one second support section (502), wherein the second support section (502) and the first support section (501) are arranged successively along a longitudinal direction of the core support plate (500);wherein the orthogonal projection of the first support section (501) onto the second side wall (102) overlaps at least part of the explosion protection valve (300), while the orthogonal projection of the second support section (502) onto the second side wall (102) is offset from the explosion protection valve (300); wherein the maximum thickness of the second support section (502) is greater than the maximum thickness of the first support section (501). [2] Single-cell battery according to claim 1, characterized by , that the difference A between the maximum thickness of the second support section (502) and the maximum thickness of the first support section (501) is in the range of 0.4 mm ≤ A ≤ 1.5 mm. [3] Single-cell battery according to claim 1 or 2, characterized by, that the second support section (502) comprises a second flat plate (502a) and a projecting section (502b) extending from the second flat plate (502a), wherein the area in which the projecting section (502b) is provided forms the area of ​​maximum thickness of the second support section (502). [4] Single-cell battery according to claim 3, characterized by , that all projecting sections (502b) are provided on the side of the second flat plate (502a) facing the second side wall (102); or that all projection sections (502b) are provided on the side of the second flat plate (502a) facing the electrical core (400); or a part of the projection sections (502b) is provided on the side of the second flat plate (502a) facing the second side wall (102) and a part of the projection sections (502b) is provided on the side of the second flat plate (502a) facing the electrical core (400). [5] Single-cell battery according to claim 3, characterized by , that a plurality of the projection sections (502b) are provided spaced apart at each support section (502) along the longitudinal direction of the core support plate (500). [6] Single-cell battery according to claim 5, characterized by , that along the longitudinal direction of the core support plate (500) the distance B between adjacent projection sections (502b) at every second support section (502) is in the range 1 mm ≤ B ≤ 5 mm. [7] Single-cell battery according to claim 3, characterized by , that every second support section (502) is provided with one of the projection sections (502b) in the center at an end facing away from the first support section (501) in a thickness direction of the core support plate (500). [8] Single-cell battery according to claim 3, characterized by , that the height H by which the projecting section (502b) protrudes from the second flat plate (502a) is in the range of 0.4 mm ≤ H ≤ 1.0 mm. [9] Single-cell battery according to claim 2, characterized by , that the first support section (501) is provided with a plurality of through holes (501b), wherein the ratio C of the orthogonal projection area of ​​all through holes (501b) on the second side wall (102) to the orthogonal projection area of ​​the core support plate (500) on the second side wall (102) is in the range of 8% ≤ C ≤ 40%; wherein the height H by which the projecting section (502b) protrudes from the second flat plate (502a) is in the range of 0.4 mm ≤ H ≤ 0.9 mm. [10] Single-cell battery according to claim 3, characterized by , that the back of the second flat plate (502a) on which the projecting section (502b) is provided forms a recess (505) wherein a high temperature resistant element is provided in the recess (505) wherein the melting point of the high temperature resistant element is higher than the melting point of the core support plate (500). [11] Battery pack, characterized by , that the battery pack comprises a base plate and a single-cell battery according to one of claims 1 to 10, wherein the single-cell battery is located on the base plate, wherein the explosion protection valve (300) of the single-cell battery faces the base plate.

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