Batteries, battery packs, and vehicles

Abstract

A battery, a battery pack, and a vehicle, the battery comprising: a battery casing, a drawer piece and conductive pillars, the drawer piece being disposed within the battery casing, via holes being formed within the battery casing to allow the conductive pillars to pass through, an inner end of each conductive pillar being connected to the drawer piece and an outer end of each conductive pillar extending outwardly from the battery casing, and a sealing ring, the sealing ring being in sealed connection between the conductive pillars and the battery casing, the sealing ring being constructed to be an elastic piece, each sealing ring having an initial size in its axial direction of d1, and each sealing ring having a compressed size in its axial direction of d2, d1 and d2 satisfying 0.5≦d2 / d1≦0.9.

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This disclosure claims priority to Chinese Patent Application No. 202221134867.2 filed on May 12, 2022 by BYD Company Limited, the disclosure of which is incorporated herein by reference in its entirety.

[0002] The present disclosure relates to the field of battery technology, and in particular to batteries, battery packs, and vehicles. [Background technology]

[0003] In related art batteries, the sealing ring is sleeved on the conductive pillar and adapted to be hermetically connected between the conductive pillar and the battery casing. However, the thickness of the existing sealing ring is either too small to meet the sealing performance or too large, occupying the inner space of the battery and causing a reduced capacity for the same size battery. Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure aims to solve at least one of the technical problems in the related art. To this end, the present disclosure aims to provide a battery, the sealing ring of which has a certain amount of compressibility, which facilitates the installation of the drawer piece and the conductive pillar installation spacer ring, and ensures the sealing performance between the drawer piece and the battery casing, and between the conductive pillar and the sealing ring. [Means for solving the problem]

[0005] The present disclosure further provides a battery pack having a battery.

[0006] The present disclosure further provides a vehicle having a battery.

[0007] A battery according to the present disclosure includes a battery casing, a pull-out piece and a conductive pillar, the pull-out piece being disposed within the battery casing, the battery casing being provided with a via hole allowing the conductive pillar to extend therethrough, an inner end of the conductive pillar being connected to the pull-out piece and an outer end of the conductive pillar extending outward from the battery casing, and a sealing ring, the sealing ring being hermetically connected between the conductive pillar and the battery casing, the sealing ring being configured as an elastic piece, an initial size of the sealing ring in its axial direction is d1, and a size of the sealing ring after axial compression is d2, d1 and d2 satisfy 0.5≦d2 / d1≦0.9, where d1 and d2 are both in mm.

[0008] In the battery of the present disclosure, the ratio of the compressed size of the sealing ring to its initial size is specified, which ensures that the sealing ring has a certain amount of compressibility, which facilitates the installation of the pull-out piece and the conductive pillar installation spacer ring, and ensures the sealing performance between the pull-out piece and the battery casing, and between the conductive pillar and the sealing ring.

[0009] According to one embodiment of the present disclosure, a sealing ring is sleeved onto the conductive pillar, with at least a portion of the sealing ring being sandwiched between the inner wall of the cell casing and the pull piece.

[0010] According to one embodiment of the present disclosure, a sealing ring is sleeved onto a conductive pillar, a flanged edge is disposed on the outer circumferential surface of the conductive pillar, the flanged edge is connected to the pull piece, and at least a portion of the sealing ring is sandwiched between the flanged edge and the inner wall of the cell casing.

[0011] According to one embodiment of the present disclosure, after the sealing ring is axially compressed, the width of the contact area between the sealing ring and the inner wall surface of the cell casing is W, where W satisfies 1.2 mm≦W≦2.5 mm.

[0012] According to one embodiment of the present disclosure, the width of the contact area between the sealing ring and the pull piece is W, where W satisfies 1.2 mm≦W≦2.5 mm.

[0013] According to one embodiment of the present disclosure, the lead piece includes a positive electrode lead piece and a negative electrode lead piece, and the conductive pillar includes a positive electrode conductive pillar and a negative electrode conductive pillar.

[0014] The cell casing includes a first plate member and a second plate member directly opposite one another in a longitudinal direction, a positive electrode conductive pillar extending through the first plate member and connected to a positive electrode lead piece, and a negative electrode conductive pillar extending through the second plate member and connected to a negative electrode lead piece.

[0015] According to one embodiment of the present disclosure, the battery casing further includes a third plate member and a fourth plate member directly opposite each other in the width direction, and a fifth plate member and a sixth plate member directly opposite each other in the thickness direction.

[0016] The first plate member, the second plate member, the third plate member, the fourth plate member and the fifth plate member are formed as a lower casing having an opening on a side, and the sixth plate member is fixedly connected to the lower casing so as to close the open end of the lower casing.

[0017] According to one embodiment of the present disclosure, the battery casing is constructed as an aluminum alloy part. The plate thickness of the lower casing and the plate thickness of the sixth plate member are in the range of 0.2mm to 0.5mm. Or, the battery casing is constructed as a stainless steel part or a nickel-plated steel part. The plate thickness of the lower casing and the plate thickness of the sixth plate member are in the range of 0.05mm to 0.2mm.

[0018] A battery pack according to the present disclosure includes a battery.

[0019] A vehicle according to the present disclosure includes a battery or battery pack.

[0020] Other aspects and advantages of the disclosure will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.

[0021] The above and / or other additional aspects and advantages of the present disclosure will become apparent and understandable from the following detailed description of the embodiments taken in conjunction with the accompanying drawings. [Brief description of the drawings]

[0022] [Figure 1] FIG. 2 is a schematic diagram illustrating a lower casing of a battery according to an embodiment of the present disclosure. [Diagram 2] FIG. 1 is a schematic diagram illustrating a battery according to an embodiment of the present disclosure. [Diagram 3] FIG. 3 is a partially enlarged schematic view of the boxed area C in FIG. 2. [Figure 4] FIG. 1 is a schematic diagram illustrating a battery according to an embodiment of the present disclosure. [Diagram 5] FIG. 5 is a partially enlarged schematic diagram of the enclosed area D in FIG. 4. [Figure 6] FIG. 2 is a schematic diagram illustrating a first positive electrode (negative electrode) conductive pillar or a second positive electrode (negative electrode) conductive pillar having a circular cross-section, according to an embodiment of the present disclosure. [Figure 7] FIG. 2 is a schematic diagram illustrating a first positive electrode (negative electrode) conductive pillar or a second positive electrode (negative electrode) conductive pillar having a racetrack-shaped cross-section according to an embodiment of the present disclosure. [Figure 8] FIG. 2 is a cross-sectional view of a battery according to an embodiment of the present disclosure. [Figure 9] FIG. 9 is a partially enlarged schematic view of the boxed area E in FIG. 8. [Figure 10] FIG. 9 is a partially enlarged schematic view of the enclosed area H in FIG. 8. [Figure 11] FIG. 2 is a schematic diagram illustrating a first insulating spacer ring according to an embodiment of the present disclosure. [Figure 12]FIG. 13 is a schematic diagram showing a second insulating spacer ring fitted to a negative electrode lead piece according to an embodiment of the present disclosure. [Figure 13] FIG. 2 is a schematic diagram illustrating a positive electrode lead piece according to an embodiment of the present disclosure. [Figure 14] FIG. 2 is a schematic diagram illustrating a negative electrode lead piece according to an embodiment of the present disclosure. [Figure 15] FIG. 2 is an exploded view of a battery according to an embodiment of the present disclosure. [Figure 16] 1 is a schematic diagram showing a battery from one direction according to an embodiment of the present disclosure. FIG. [Figure 17] FIG. 2 is a schematic diagram showing a battery from another direction, according to an embodiment of the present disclosure. [Figure 18] FIG. 2 is a schematic diagram showing a battery from another direction, according to an embodiment of the present disclosure. [Figure 19] FIG. 2 is a schematic diagram showing a positive electrode conductive pillar and a sealing ring of a battery mated to a battery casing according to another embodiment of the present disclosure. [Figure 20] FIG. 2 is a schematic diagram showing a negative electrode conductive pillar and a sealing ring of a battery mated to a battery casing according to another embodiment of the present disclosure. [Figure 21] FIG. 13 is a diagram showing temperature rise curves of a positive electrode conductive pillar and a negative electrode conductive pillar in the comparative embodiment and embodiment 1. [Figure 22] FIG. 13 is a diagram showing temperature rise curves of a positive electrode conductive pillar and a negative electrode conductive pillar in a comparative embodiment and embodiment 2. [Diagram 23] FIG. 13 is a diagram showing temperature rise curves of a positive electrode conductive pillar and a negative electrode conductive pillar in a comparative embodiment and embodiment 3. [Figure 24] FIG. 13 is a diagram showing temperature rise curves of a positive electrode conductive pillar and a negative electrode conductive pillar in a comparative embodiment and embodiment 4. [Diagram 25] FIG. 13 is a diagram showing temperature rise curves of a positive electrode conductive pillar and a negative electrode conductive pillar in a comparative embodiment and embodiment 5. [Figure 26]FIG. 13 is a diagram showing temperature rise curves of a positive electrode conductive pillar and a negative electrode conductive pillar in a comparative embodiment and embodiment 6. [Figure 27] FIG. 13 is a diagram showing temperature rise curves of a positive electrode conductive pillar and a negative electrode conductive pillar in the comparative embodiment and embodiment 7. [Figure 28] FIG. 13 is a diagram showing temperature rise curves of a positive electrode conductive pillar and a negative electrode conductive pillar in a comparative embodiment and embodiment 8. [Figure 29] FIG. 11 is a diagram showing temperature rise curves of a positive electrode lead piece and a negative electrode lead piece in the comparative embodiment and embodiment 1. [Diagram 30] FIG. 11 is a diagram showing temperature rise curves of a positive electrode lead piece and a negative electrode lead piece in a comparative embodiment and embodiment 2. [Diagram 31] FIG. 13 is a diagram showing temperature rise curves of a positive electrode lead piece and a negative electrode lead piece in a comparative embodiment and embodiment 3. [Diagram 32] FIG. 13 is a diagram showing temperature rise curves of a positive electrode lead piece and a negative electrode lead piece in a comparative embodiment and embodiment 4. [Diagram 33] FIG. 13 is a diagram showing temperature rise curves of a positive electrode lead piece and a negative electrode lead piece in the comparative embodiment and embodiment 5. [Diagram 34] FIG. 13 is a diagram showing temperature rise curves of a positive electrode lead piece and a negative electrode lead piece in a comparative embodiment and embodiment 6. [Diagram 35] FIG. 13 is a diagram showing temperature rise curves of a positive electrode lead piece and a negative electrode lead piece in the comparative embodiment and embodiment 7. [Diagram 36] FIG. 13 is a diagram showing temperature rise curves of a positive electrode lead piece and a negative electrode lead piece in a comparative embodiment and embodiment 8. [Figure 37] FIG. 1 is a schematic diagram illustrating a battery pack according to an embodiment of the present disclosure. [Figure 38] 1 is a schematic diagram illustrating a vehicle according to an embodiment of the present disclosure. [Figure 39] FIG. 2 is a schematic diagram illustrating a vehicle according to another embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The embodiments of the present disclosure are described in detail below, and examples of the embodiments are shown in the accompanying drawings, in which the same or similar elements, or elements having the same or similar functions, are indicated by the same or similar reference numerals throughout the description. The embodiments described below with reference to the accompanying drawings are exemplary and are used only to explain the present disclosure, and should not be construed as limitations on the present disclosure.

[0024] A battery 100 according to an embodiment of the present disclosure is described below with reference to FIGS.

[0025] A battery according to one embodiment of the present disclosure includes a battery casing 110, an electrode core 120, and a conductive pillar.

[0026] The electrode core 120 is disposed inside the cell casing 110, and the conductive pillars extend through the cell casing 110 such that inner ends of the conductive pillars are connected to the electrode core 120, and outer ends of the conductive pillars extend outside the cell casing 110. In particular, the inner ends of the conductive pillars are connected to tabs on the electrode core 120. Furthermore, the conductive pillars have a cross-sectional area s, and the cell has a capacity C, where s and C satisfy the relationship: C / s≦8, where s is mm 2 and C is in Ah units.

[0027] It should be understood that the size of the cross-sectional area of ​​the conductive pillar represents the current path capacity of the conductive pillar. The larger the cross-sectional area of ​​the conductive pillar, the greater the current path capacity of the conductive pillar. Furthermore, the minimum cross-sectional area on the conductive pillar determines the current path capacity of the conductive pillar. The cross-section of the conductive pillar is a plane perpendicular to the current flow direction. If the conductive pillar is a cylinder and the current flow direction through the conductive pillar is axial, the cross-section of the conductive pillar is a circular radial cross-section. If the conductive pillar adopts a varying cross-section design, the cross-sectional area of ​​the conductive pillar can be understood as the area of ​​the minimum cross-section on the conductive pillar.

[0028] After extensive experiments and discussions, the inventors of the present disclosure have found that when the relationship C / s≦8 is satisfied, the current path capacity of the conductive pillars of the battery 100 can be ensured, and the temperature of the battery 100 during use will not exceed the operating temperature range of the battery 100 due to the large heat generation caused by the small current path area, ensuring that no thermal safety issues of the battery 100 occur.

[0029] In some embodiments of the present disclosure, the cross-sectional area s of the conductive pillar and the battery capacity C satisfy the relationship: 6 / 5≦C / s≦8. The inventors have found that it is desirable for the ratio of the battery capacity C to the cross-sectional area s of the conductive pillar to be as small as possible. Too small a ratio will result in the conductive pillar being oversized, resulting in a redundant design.

[0030] In some embodiments of the present disclosure, the conductive pillars include a positive electrode conductive pillar 131 and a negative electrode conductive pillar 132. The cross-sectional area s1 of the positive electrode conductive pillar 131 and the battery capacity C satisfy the relationship: 6 / 5≦C / s1≦16 / 3, and the cross-sectional area s2 of the negative electrode conductive pillar 132 and the battery capacity C satisfy the relationship: 6 / 5≦C / s2≦8, where s1 and s2 are both mm 2 It should be understood that when the positive electrode conductive pillar 131 includes multiple positive electrode poles extending through the battery casing 110 and connected to the positive electrode tab of the electrode core 120, the cross-sectional area s1 of the positive electrode conductive pillar 131 is the sum of the cross-sectional areas of the multiple positive electrode poles. When the positive electrode poles adopt a varying cross-sectional design, the cross-sectional area of ​​the positive electrode pole can be understood as the area of ​​the smallest cross section on the positive electrode pole. When the negative electrode conductive pillar 132 includes multiple negative electrode poles extending through the battery casing 110 and connected to the negative electrode tab of the electrode core 120, the cross-sectional area s2 of the negative electrode conductive pillar 132 is the sum of the cross-sectional areas of the multiple negative electrode poles. When the negative electrode poles adopt a varying cross-sectional design, the cross-sectional area of ​​the negative electrode pole can be understood as the area of ​​the smallest cross section on the negative electrode pole.

[0031] Furthermore, the cross-sectional area s1 of the positive electrode conductive pillar 131 and the battery capacity C satisfy the relation: 8 / 3≦C / s1≦16 / 3, and the cross-sectional area s2 of the negative electrode conductive pillar 132 and the battery capacity C satisfy the relation: 3≦C / s2≦8.

[0032] It should be noted that the positive electrode conductive pillar 131 of the battery 100 may be made of aluminum, and the negative electrode conductive pillar 132 may be made of copper. However, the electrical conductivity of aluminum and copper is different. With the same cross-sectional area, the current path capacity of copper is larger than that of aluminum. Therefore, to ensure that the positive electrode conductive pillar 131 and the negative electrode conductive pillar 132 have the same current path capacity, the negative electrode conductive pillar 132 made of copper can be made to have a smaller cross-sectional area.

[0033] In some embodiments of the present disclosure, the cross-sectional area s1 of the positive electrode conductive pillar and the cross-sectional area s2 of the negative electrode conductive pillar are less than 12 mm 2 ~315mm 2 and the battery capacity C is in the range of 30 Ah to 400 Ah.

[0034] Description will be given in conjunction with the comparative embodiment (i.e., related art) and embodiments 1 to 8 (embodiments of the present disclosure) in Table 1 below. Under the same operating conditions, the batteries of the comparative embodiment and embodiments 1 to 8 were charged at a rate of 2C, respectively, and the temperature rise curves of the positive electrode conductive pillar 131 and the negative electrode conductive pillar 132 were recorded. In the comparative embodiment and embodiments 1 to 8, the cross-sectional area s1 of the positive electrode conductive pillar 131, the cross-sectional area s2 of the negative electrode conductive pillar 132, and the total battery capacity C are selected from the data in Table 1 below. FIG. 21 shows the temperature rise curves of the positive electrode conductive pillar 131 and the negative electrode conductive pillar 132 in the comparative embodiment and embodiment 1. FIG. 22 shows the temperature rise curves of the positive electrode conductive pillar 131 and the negative electrode conductive pillar 132 in the comparative embodiment and embodiment 2. FIG. 23 shows the temperature rise curves of the positive electrode conductive pillar 131 and the negative electrode conductive pillar 132 in the comparative embodiment and embodiment 3. FIG. 24 shows temperature rise curves of the positive electrode conductive pillar 131 and the negative electrode conductive pillar 132 in the comparative embodiment and embodiment 4. FIG. 25 shows temperature rise curves of the positive electrode conductive pillar 131 and the negative electrode conductive pillar 132 in the comparative embodiment and embodiment 5. FIG. 26 shows temperature rise curves of the positive electrode conductive pillar 131 and the negative electrode conductive pillar 132 in the comparative embodiment and embodiment 6. FIG. 27 shows temperature rise curves of the positive electrode conductive pillar 131 and the negative electrode conductive pillar 132 in the comparative embodiment and embodiment 7. FIG. 28 shows temperature rise curves of the positive electrode conductive pillar 131 and the negative electrode conductive pillar 132 in the comparative embodiment and embodiment 8. [Table 1]

[0035] After many experiments, the inventors have obtained the comparison results between the current path capacity of the conductive pillars of the present disclosure and the current path capacity of the conductive pillars of the prior art, as shown in FIGS.

[0036] Compared with the comparative embodiments, the temperature rise of the positive electrode conductive pillars 131 and the negative electrode conductive pillars 132 in embodiments 1 to 8 is relatively low, which ensures that the battery is in good working condition.

[0037] 3 and 5, the positive electrode conductive pillar 131 includes a first positive electrode conductive pillar 131a, a second positive electrode conductive pillar 131b, and a first connecting piece 131c. Both the first positive electrode conductive pillar 131a and the second positive electrode conductive pillar 131b extend through the battery casing 110 and are connected to the positive electrode tab of the electrode core 120. The first connecting piece 131c is disposed outside the battery casing 110 and is electrically connected to the first positive electrode conductive pillar 131a and the second positive electrode conductive pillar 131b. The cross-sectional area s1 of the positive electrode conductive pillar 131 is the sum of the cross-sectional area of ​​the first positive electrode conductive pillar 131a and the cross-sectional area of ​​the second positive electrode conductive pillar 131b.

[0038] The negative electrode conductive pillar 132 includes a first negative electrode conductive pillar 132a, a second negative electrode conductive pillar 132b, and a second connection piece 132c. Both the first negative electrode conductive pillar 132a and the second negative electrode conductive pillar 132b extend through the battery casing 110 and are connected to the negative electrode tab of the electrode core 120. The second connection piece 132c is disposed outside the battery casing 110 and is electrically connected to the first negative electrode conductive pillar 132a and the second negative electrode conductive pillar 132b. The cross-sectional area s2 of the negative electrode conductive pillar 132 is the sum of the cross-sectional area of ​​the first negative electrode conductive pillar 132a and the cross-sectional area of ​​the second negative electrode conductive pillar 132b.

[0039] The first connection piece 131c is connected between the outer end of the first positive electrode conductive pillar 131a and the outer end of the second positive electrode conductive pillar 131b, and increases the contact area between the first positive electrode conductive pillar 131a and the second positive electrode conductive pillar 131b, allowing the positive electrode conductive pillar 131 to be more easily connected to the outside. The second connection piece 132c is connected between the outer end of the first negative electrode conductive pillar 132a and the outer end of the second negative electrode conductive pillar 132b, and increases the contact area between the first negative electrode conductive pillar 132a and the second negative electrode conductive pillar 132b, allowing the negative electrode conductive pillar 132 to be more easily connected to the outside.

[0040] In some embodiments of the present disclosure, the first positive electrode conductive pillar 131a and the second positive electrode conductive pillar 131b have a circular or hourglass-shaped cross section, and the first negative electrode conductive pillar 132a and the second negative electrode conductive pillar 132b have a circular or hourglass-shaped cross section. When the size of the battery casing 110 is large in the thickness direction, the first positive electrode conductive pillar 131a, the second positive electrode conductive pillar 131b, the first negative electrode conductive pillar 132a, and the second negative electrode conductive pillar 132b having a circular cross section may be used. However, when the size of the battery casing 110 is small in the thickness direction, the first positive electrode conductive pillar 131a, the second positive electrode conductive pillar 131b, the first negative electrode conductive pillar 132a, and the second negative electrode conductive pillar 132b having a hourglass-shaped cross section may be used. In this manner, the first positive electrode conductive pillar 131a, the second positive electrode conductive pillar 131b, the first negative electrode conductive pillar 132a, and the second negative electrode conductive pillar 132b do not exceed the size of the battery casing 110 in the thickness direction, ensuring that the positive electrode conductive pillar 131 and the negative electrode conductive pillar 132 have sufficient current path capacity.

[0041] 1 to 4 and 15 to 20, the battery casing 110 includes a first plate member 111 and a second plate member 112 that are directly opposite each other in the length direction of the battery 100, a third plate member 113 and a fourth plate member 114 that are directly opposite each other in the width direction of the battery 100, and a fifth plate member 115 and a sixth plate member 116 that are directly opposite each other in the thickness direction of the battery 100. The size of the battery 100 in the length direction is larger than the size of the battery 100 in the width direction, and the size of the battery 100 in the width direction is larger than the size of the battery 100 in the thickness direction.

[0042] The first plate member 111 and the second plate member 112 are connected to one end and the other end of the third plate member 113 and the fourth plate member 114 on the same side in the length direction of the battery 100. In other words, the first plate member 111 is connected to one end of the third plate member 113 and the fourth plate member 114 on the same side in the length direction of the battery 100, and the second plate member 112 is connected to the other end of the third plate member 113 and the fourth plate member 114 on the same side in the length direction of the battery 100. The fifth plate member 115 and the sixth plate member 116 are connected to one end of the third plate member 113 and the fourth plate member 114 on the same side in the thickness direction of the battery 100. In other words, the fifth plate member 115 is connected to one end of the third plate member 113 and the fourth plate member 114 on the same side in the thickness direction of the battery 100, and the sixth plate member 116 is connected to the other end of the third plate member 113 and the fourth plate member 114 on the same side in the thickness direction of the battery 100.

[0043] A positive electrode conductive pillar 131 is disposed on the first plate member 111, and a negative electrode conductive pillar 132 is disposed on the second plate member 112. A first insulating plate 131d is disposed between the first plate member 111 and the first connecting piece 131c, and a second insulating plate 132d is disposed between the second plate member 112 and the second connecting piece 132c, effectively avoiding electrical connection between the first connecting piece 131c and the battery casing 110, and electrical connection between the second connecting piece 132c and the battery casing 110.

[0044] Furthermore, the first plate member 111 is provided with a first via hole through which the first positive electrode conductive pillar 131a extends and a second via hole through which the second positive electrode conductive pillar 131b extends. The second plate member 112 is provided with a third via hole through which the first negative electrode conductive pillar 132a extends and a fourth via hole through which the second negative electrode conductive pillar 132b extends.

[0045] Furthermore, a positive electrode lead piece 141 and a negative electrode lead piece 142 are disposed inside the battery casing 110. The positive electrode lead piece 141 is connected to the positive electrode tab of the electrode core 120, and the positive electrode lead piece 141 is also connected to the positive electrode conductive pillar 131. The negative electrode lead piece 142 is connected to the negative electrode tab of the electrode core 120, and the negative electrode lead piece 142 is also connected to the negative electrode conductive pillar 132.

[0046] As shown in Figures 9 and 10, a first sealing ring 151 is sleeved onto the positive electrode conductive pillar 131, and the first sealing ring 151 is sandwiched between the positive electrode lead piece 141 and the first plate member 111. A second sealing ring 152 is sleeved onto the negative electrode conductive pillar 132, and the second sealing ring 152 is sandwiched between the negative electrode lead piece 142 and the second plate member 112. Thus, the positive electrode conductive pillar 131 is confined by the first sealing ring 151, so that the positive electrode conductive pillar 131 does not contact the inner wall surface of the via hole of the first plate member 111 that extends therethrough. The negative electrode conductive pillar 132 is confined by the second sealing ring 152, so that the negative electrode conductive pillar 132 does not contact the inner wall surface of the via hole of the second plate member 112 that extends therethrough.

[0047] A first insulating spacer ring 161 is also disposed between the positive electrode lead piece 141 and the first plate member 111. The positive electrode conductive pillar 131 extends through the first insulating spacer ring 161 and is connected to the positive electrode lead piece 141. The first insulating spacer ring 161 is an insulating member. By using the first insulating spacer ring 161, contact between the positive electrode lead piece 141 and the battery casing 110 can be avoided, thereby improving the safety performance of the battery 100.

[0048] In addition, a second insulating spacer ring 162 is disposed between the negative electrode lead piece 142 and the second plate member 112. The negative electrode conductive pillar 132 extends through the second insulating spacer ring 162 and is connected to the negative electrode lead piece 142. The second insulating spacer ring 162 is an insulating member. By using the second insulating spacer ring 162, contact between the negative electrode lead piece 142 and the battery casing 110 can be avoided, thereby improving the safety performance of the battery 100.

[0049] Furthermore, the outer side of the first insulating spacer ring 161 is provided with a first step portion that fits with the inner end of the first sealing ring 151. The first step portion can limit the movement of the first sealing ring 151 and the positive electrode conductive pillar 131 to avoid direct contact with the positive electrode conductive pillar 131 and the battery casing 110. The outer side of the second insulating spacer ring 162 is provided with a second step portion that fits with the inner end of the second sealing ring 152. The second step portion can limit the movement of the second sealing ring 152 and the negative electrode conductive pillar 132 to avoid direct contact with the negative electrode conductive pillar 132 and the battery casing 110.

[0050] It should be understood that a portion of the inner end of the positive electrode conductive pillar 131 fits into a stepped portion on the first insulating spacer ring 161, and another portion of the positive electrode conductive pillar 131 abuts the positive electrode lead piece 141. A portion of the inner end of the negative electrode conductive pillar 132 fits into a stepped portion on the second insulating spacer ring 162, and another portion of the negative electrode conductive pillar 132 abuts the negative electrode lead piece 142.

[0051] In some embodiments of the present disclosure, the size of the first insulating member vertical plate 161b and the second insulating member vertical plate 162b is in the range of 0.3 mm to 1.5 mm in the length direction of the battery casing. This is intended to ensure insulation between the positive electrode lead piece 141 and the battery casing 110 and between the negative electrode lead piece 142 and the battery casing 110, and to occupy as little space as possible in the length direction inside the battery casing 110. If the thickness is less than 0.3 mm, the welding heat may melt the spacer ring when the tab is welded to the lead piece, leading to insufficient insulation. If the thickness is more than 1.5 mm, too much space is occupied inside the battery casing 110, reducing the space utilization rate and affecting the design capacity of the battery 100. Therefore, after many tests and adjustments by the inventors of the present disclosure, the size of the first insulating member vertical plate 161b and the second insulating member vertical plate 162b in the length direction of the battery casing 110 is determined to be in the range of 0.3 mm to 1.5 mm.

[0052] As shown in Figs. 11 and 12, the first insulating spacer ring 161 includes a first support member 161a and a first insulating member coupled to the first support member 161a. The inner end and the outer end of the first support member 161a abut against the electrode core 120 and the first plate member 111 of the battery 100, respectively. The first insulating member fits with the positive electrode lead piece 141 and is disposed between the positive electrode lead piece 141 and the battery casing 110. The second insulating spacer ring 162 includes a second support member 162a and a second insulating member coupled to the second support member 162a. The inner end and the outer end of the second support member 162a abut against the end of the electrode core 120 and the second plate member 112, respectively. The second insulating member is fitted with the negative electrode lead piece 142 and is disposed between the negative electrode lead piece 142 and the battery casing 110 .

[0053] The first insulating member includes a first insulating member vertical plate 161b and a first insulating member horizontal plate 161c. The first insulating member vertical plate 161b is disposed between the positive electrode first connection sheet 141a and the first plate member 111, and the first insulating member horizontal plate 161c is disposed between the positive electrode second connection sheet 141b and one of the side plates in the thickness direction of the battery casing 110. The second insulating member includes a second insulating member vertical plate 162b and a second insulating member horizontal plate 162c. The second insulating member vertical plate 162b is disposed between the negative electrode first connection sheet 142a and the second plate member 112, and the second insulating member horizontal plate 162c is disposed between the negative electrode second connection sheet 142b and one of the side plates in the thickness direction of the battery casing 110.

[0054] In some embodiments of the present disclosure, the first plate member 111, the second plate member 112, the third plate member 113, the fourth plate member 114 and the fifth plate member 115 define a lower casing having an opening at a side, and the sixth plate member 116 is fixedly connected to the lower casing to close the open end of the lower casing. Thus, the electrode core 120 does not need to enter the cell casing 110 through a narrow passage, but enters the cell casing 110 through a very wide open end, thus greatly reducing installation costs and saving installation time.

[0055] In particular, the first insulating member horizontal plate 161c is disposed between the positive electrode second connection sheet 141b and the fifth plate member 115, and the second insulating member horizontal plate 162c is disposed between the negative electrode second connection sheet 142b and the fifth plate member 115.

[0056] The size of the first support member 161a in the length direction of the battery casing 110 is larger than the size of the first insulating member vertical plate 161b in the length direction of the battery casing 110. The size of the second support member 162a in the length direction of the battery casing 110 is larger than the size of the second insulating member vertical plate 162b in the length direction of the battery casing 110. Therefore, the first support member 161a and the second support member 162a can firmly clamp the electrode core 120 in the battery casing 110 to prevent the electrode core 120 from moving in the battery casing 110.

[0057] In some embodiments of the present disclosure, the outer end surface of the positive electrode conductive pillar 131 extends outside the battery casing and has a distance in the range of 2 mm to 5 mm relative to the outer side surface of the first plate member 111. The outer end surface of the negative electrode conductive pillar 132 extends outside the battery casing and has a distance in the range of 2 mm to 5 mm relative to the outer side surface of the second plate member 112. Therefore, both the positive electrode conductive pillar 131 and the negative electrode conductive pillar 132 have sufficient protrusions to connect with external electrical devices, and are guaranteed not to occupy too much space in the length direction of the battery 100 when the total length of the battery 100 is constant, so that the battery 100 can have sufficient capacity.

[0058] In a battery 100 according to an embodiment of the present disclosure, both the electrode core 120 and the drawer piece are disposed within the battery casing 110. The drawer piece and the electrode core 120 are connected. In particular, the drawer piece is connected to a tab on the electrode core 120. A conductive pillar extends through the battery casing 110. An inner end of the conductive pillar is connected to the drawer piece, and an outer end of the conductive pillar extends outside the battery casing 110. In this manner, charging and discharging of the electrode core 120 can be performed by the conductive pillar.

[0059] Cross-sectional area of ​​the pull-out piece s lead and the battery capacity C are expressed by the following equation: C / s lead≦15. Note that the cross-sectional area of ​​the pull-out piece determines the current path capacity of the pull-out piece. Therefore, in this relationship, the current path capacity of the pull-out piece is expressed as the ratio of the battery capacity to the cross-sectional area of ​​the pull-out piece. Note that the cross-section of the pull-out piece is a plane perpendicular to the current flow direction, i.e., a plane perpendicular to the thickness direction of the pull-out piece. If the pull-out piece adopts a variable cross-sectional design, the cross-sectional area of ​​the pull-out piece is the minimum cross-sectional area on the pull-out piece.

[0060] After extensive testing, the inventors of the present disclosure have found that if the relationship is satisfied, the current path capacity of the draw-out piece can be ensured, the temperature of the draw-out piece during use of the battery 100 will not suffer from large heat generation caused by the small current path area, the temperature distribution inside the battery 100 will not be affected, the internal temperature of the battery 100 will not exceed the operating temperature range of the battery 100, and it ensures that no problems will arise with the thermal safety of the battery 100.

[0061] In addition, the cross-sectional area s of the pull-out piece lead and the battery capacity C is expressed by the following formula: 2≦C / s lead ≦15. Thus, it is further ensured that the pull-out piece has a sufficient current path capacity. lead It has been found that it is desirable for the ratio of the battery capacity C to the capacity D to be as small as possible. A ratio that is too small will result in a drawer piece that is too large in size, resulting in a redundant design and occupying too much space within the battery.

[0062] In some embodiments of the present disclosure, as shown in FIGS. 13-14 , the lead piece includes a positive electrode lead piece 141 and a negative electrode lead piece 142, and the conductive pillar includes a positive electrode conductive pillar 131 and a negative electrode conductive pillar 132. The positive electrode conductive pillar 131 extends through the battery casing 110 and is connected to the positive electrode lead piece 141. The negative electrode conductive pillar 132 extends through the battery casing 110 and is connected to the negative electrode lead piece 142. The positive electrode lead piece 141 is connected to a positive electrode tab of the electrode core 120, and the negative electrode lead piece 142 is connected to a negative electrode tab of the electrode core 120.

[0063] Cross-sectional area s of the positive electrode lead piece 141 positive lead and the battery capacity C is expressed by the following formula: 5≦C / s positive lead ≦12. The cross-sectional area s of the negative electrode lead piece 142 negative lead and the battery capacity C is expressed by the following formula: 6≦C / s negative lead ≦15. Positive electrode lead piece 141 may be an aluminum sheet, and negative electrode lead piece 142 may be a copper sheet. Since the current path capacity of an aluminum sheet is smaller than the current path capacity of a copper sheet with the same cross-sectional area, the cross-sectional area of ​​the copper sheet is reduced on the premise that positive electrode lead piece 141 and negative electrode lead piece 142 have the same current path capacity.

[0064] In some embodiments of the present disclosure, the cross-sectional area of ​​the positive electrode lead piece 141 is 14 mm 2 ~150mm 2 The cross-sectional area of ​​the negative electrode lead piece 142 is in the range of 10 mm 2 ~130mm 2 and the battery capacity C is in the range of 30 Ah to 400 Ah.

[0065] The following description will be given in conjunction with a comparative embodiment (i.e., related art) and embodiments 1 to 8 (embodiments of the present disclosure) in Table 2 below. Under the same operating conditions, the batteries of the comparative embodiment and embodiments 1 to 8 were charged at a rate of 2C, respectively, and the temperature rise curves of the positive electrode lead piece 141 and the negative electrode lead piece 142 were recorded. In the comparative embodiment and embodiments 1 to 8, the cross-sectional area s positive lead , the cross-sectional area s of the negative electrode lead piece 142 negative lead , and the total battery capacity C are selected from the data in Table 2 below. FIG. 29 shows temperature rise curves of the positive electrode lead piece 141 and the negative electrode lead piece 142a in the comparative embodiment and embodiment 1. FIG. 30 shows temperature rise curves of the positive electrode lead piece 141 and the negative electrode lead piece 142a in the comparative embodiment and embodiment 2. FIG. 31 shows temperature rise curves of the positive electrode lead piece 141 and the negative electrode lead piece 142a in the comparative embodiment and embodiment 3. FIG. 32 shows temperature rise curves of the positive electrode lead piece 141 and the negative electrode lead piece 142a in the comparative embodiment and embodiment 4. FIG. 33 shows temperature rise curves of the positive electrode lead piece 141 and the negative electrode lead piece 142a in the comparative embodiment and embodiment 5. FIG. 34 shows temperature rise curves of the positive electrode lead piece 141 and the negative electrode lead piece 142a in the comparative embodiment and embodiment 6. 35 shows temperature rise curves of positive electrode lead piece 141 and negative electrode lead piece 142a in the comparative embodiment and embodiment 7. FIG 36 shows temperature rise curves of positive electrode lead piece 141 and negative electrode lead piece 142a in the comparative embodiment and embodiment 8. [Table 2]

[0066] Compared with the comparative embodiments, the temperature rise of the positive electrode lead piece 141 and the negative electrode lead piece 142 in the embodiments 1 to 8 is relatively low, thereby ensuring that the battery is in good working condition.

[0067] 13 and 14, the positive electrode lead piece 141 and the negative electrode lead piece 142 have the same structure and include a first connection sheet and a second connection sheet that are connected. The second connection sheet of the positive electrode lead piece 141 directly faces the fifth plate member 115 and is fixedly connected to the positive electrode tab of the electrode core 120. The first connection sheet of the positive electrode lead piece 141 directly faces the first plate member 111 and is connected to the positive electrode conductive pillar 131. The second connection sheet of the negative electrode lead piece 142 directly faces the fifth plate member 115 and is fixedly connected to the negative electrode tab of the electrode core 120. The first connection sheet of the negative electrode lead piece 142 directly faces the second plate member 112 and is connected to the negative electrode conductive pillar 132. For ease of explanation, the first connection sheet of positive electrode lead piece 141 will be referred to as positive electrode first connection sheet 141a, and the second connection sheet of positive electrode lead piece 141 will be referred to as positive electrode second connection sheet 141b. Similarly, the first connection sheet of negative electrode lead piece 142 will be referred to as negative electrode first connection sheet 142a, and the second connection sheet of negative electrode lead piece 142 will be referred to as negative electrode second connection sheet 142b.

[0068] In some embodiments of the present disclosure, the positive electrode first connection sheet 141a and the negative electrode first connection sheet 142a have a size in the range of 0.8 mm to 0.2 mm in the length direction of the battery casing.

[0069] The battery casing 110 includes a first plate member 111 and a second plate member 112 directly opposite each other in the longitudinal direction. A first connecting sheet of the positive electrode lead piece 141 is parallel to the first plate member 111, and a first connecting sheet of the negative electrode lead piece 142 is parallel to the second plate member 112.

[0070] A first insulating spacer ring 161 is disposed between the positive electrode lead piece 141 and the first plate member 111. The positive electrode conductive pillar 131 extends through the first insulating spacer ring 161 and is connected to the positive electrode lead piece 141. A second insulating spacer ring 162 is disposed between the negative electrode lead piece 142 and the second plate member 112. The negative electrode conductive pillar 132 extends through the second insulating spacer ring 162 and is connected to the negative electrode lead piece 142. In this way, direct contact of the positive electrode lead piece 141 and the negative electrode lead piece 142 with the battery casing 110 can be avoided, thereby improving the safety performance of the battery 100.

[0071] At least a portion of the first insulating spacer ring 161 is disposed between the second connection sheet of the positive electrode lead piece 141 and the fifth plate member 115. At least a portion of the second insulating spacer ring 162 is disposed between the second connection sheet of the negative electrode lead piece 142 and the fifth plate member 115. In other words, the first insulating spacer ring 161 can not only space the positive electrode lead piece 141 from the first plate member 111, but also space the positive electrode lead piece 141 from the fifth plate member 115. The second insulating spacer ring 162 can not only space the negative electrode lead piece 142 from the second plate member 112, but also space the negative electrode lead piece 142 from the fifth plate member 115.

[0072] As shown in Figs. 1 to 14, the first insulating spacer ring 161 includes a first support member 161a and a first insulating member coupled to the first support member 161a. The inner end and the outer end of the first support member 161a abut against the end of the electrode core 120 of the battery 100 and the first plate member 111, respectively. The first insulating member fits with the positive electrode lead piece 141 and is disposed between the positive electrode lead piece 141 and the battery casing 110. The second insulating spacer ring 162 includes a second support member 162a and a second insulating member coupled to the second support member 162a. The inner end and the outer end of the second support member 162a abut against the end of the electrode core 120 of the battery 100 and the second plate member 112, respectively. The second insulating member is fitted with the negative electrode lead piece 142 and is disposed between the negative electrode lead piece 142 and the battery casing 110 .

[0073] The first insulating member includes a first insulating member vertical plate 161b and a first insulating member horizontal plate 161c. The first insulating member vertical plate 161b is disposed between the positive electrode first connection sheet 141a and the first plate member 111, and the first insulating member horizontal plate 161c is disposed between the positive electrode second connection sheet 141b and the fifth plate member 115. The second insulating member includes a second insulating member vertical plate 162b and a second insulating member horizontal plate 162c. The second insulating member vertical plate 162b is disposed between the negative electrode first connection sheet 142a and the second plate member 112, and the second insulating member horizontal plate 162c is disposed between the negative electrode second connection sheet 142b and the fifth plate member 115.

[0074] The thickness of the first support member 161a in the length direction of the battery casing 110 is greater than the thickness of the first insulating member vertical plate 161b in the length direction of the battery casing 110. Therefore, the first support member 161a can abut one end portion of the electrode core 120. The thickness of the second support member 162a in the length direction of the battery casing 110 is greater than the thickness of the second insulating member vertical plate 162b in the length direction of the battery casing 110. Therefore, the second support member 162a can abut another end portion of the electrode core 120. Therefore, the first support member 161a and the second support member 162a can cooperatively abut the electrode core 120 in the length direction in the battery casing 110, and can prevent the movement of the electrode core 120 in the length direction of the battery casing 110.

[0075] In particular, the first insulating member vertical plate 161b is disposed between the positive electrode first connection sheet 141a and the first plate member 111, and the first insulating member horizontal plate 161c is disposed between the positive electrode second connection sheet 141b and the fifth plate member 115. The second insulating member vertical plate 162b is disposed between the negative electrode first connection sheet 142a and the second plate member 112, and the second insulating member horizontal plate 162c is disposed between the negative electrode second connection sheet 142b and the fifth plate member 115.

[0076] The positive electrode lead piece 141 and the first insulating member are both configured as an "L" shaped structure. The positive electrode lead piece 141 may be disposed inside the first insulating member and attached thereto. The negative electrode lead piece 142 and the second insulating member are both configured as an "L" shaped structure. The negative electrode lead piece 142 may be disposed inside the second insulating spacer ring and attached thereto.

[0077] In some embodiments of the present disclosure, both the first insulating member vertical plate 161b and the positive electrode first connection sheet 141a have a size in the range of 0.3 mm to 1.5 mm in the length direction of the battery casing 110. That is, both the first insulating member vertical plate 161b and the positive electrode first connection sheet 141a have a thickness in the range of 0.3 mm to 1.5 mm.

[0078] As a result, it can ensure the insulation between the positive electrode lead piece 141 and the battery casing 110 and between the negative electrode lead piece 142 and the battery casing 110, and occupy as little space as possible in the length direction in the battery casing 110. If the thickness is less than 0.3 mm, the welding heat may melt the spacer ring when the tab is welded to the lead piece, leading to insufficient insulation. If the thickness is more than 1.5 mm, too much space will be occupied in the battery casing 110, reducing the space utilization rate and affecting the design capacity of the battery 100.

[0079] The battery 100 according to an embodiment of the present disclosure further includes a sealing ring. The sealing ring is hermetically connected between the conductive pillar and the battery casing 110. The sealing ring is configured as an elastic piece, and the sealing ring is an insulating member, which effectively electrically insulates the pull-out piece from the battery casing 110. The initial size of the sealing ring in its axial direction is d1, and the size of the sealing ring after axial compression is d2, where d1 and d2 satisfy 0.5≦d2 / d1≦0.9, where d1 and d2 are both in mm.

[0080] In some embodiments, the sealing ring is sleeved on the conductive pillar and sandwiched between the inner wall of the cell casing 110 and the drawer piece. Note that the initial size d1 of the sealing ring in its axial direction can be understood as its axial dimension after the sealing ring is released from compression and elastically restored (d1 is the distance between its two axially opposite end faces after the sealing ring is restored). When the sealing ring is clamped between the inner wall of the cell casing and the drawer piece, d2 can be understood as the distance between two axially opposite surfaces of the sealing ring. One of the two surfaces is the surface of the sealing ring that contacts the inner wall of the cell casing, and the other is the surface of the sealing ring that contacts the drawer piece.

[0081] The initial axial size of the sealing ring is the size of the sealing ring in the axial direction before compression. After the sealing ring is compressed, the size of the sealing ring in the axial direction is smaller. By specifying the ratio of the initial size of the sealing ring to the size after compression, the sealing ring is guaranteed to have a certain amount of compression, which facilitates the installation of the pull-out piece and the conductive pillar installation spacer ring, and ensures the sealing performance between the pull-out piece and the battery casing 110, and between the conductive pillar and the sealing ring. Moreover, for the same size battery, the capacity of the battery is improved.

[0082] Since the axial size of the sealing ring is reduced after compression, the radial size is naturally increased. The axial side surfaces of the sealing ring are both annular. The axial outer end of the sealing ring contacts the inner wall surface of the cell casing 110. The axial inner end of the sealing ring contacts the pull piece. Thus, the two axial ends of the sealing ring are sandwiched between the cell casing 110 and the pull piece.

[0083] At least one of the width of the contact area between the sealing ring and the inner wall surface of the battery casing 110 and the width of the contact area between the sealing ring and the pull-out piece is W, and W satisfies 1.2 mm≦W≦2.5 mm. Therefore, the sealing performance between the sealing ring and the inner wall surface of the battery casing 110 and the sealing performance between the sealing ring and the pull-out piece are ensured. The width of the contact area between the sealing ring and the inner wall surface of the battery casing 110 can be understood as the distance between two outer contours of the contact area between the sealing ring and the inner wall surface of the battery casing 110 in the radial direction of the sealing ring. The width of the contact area between the sealing ring and the pull-out piece can be understood as the distance between two outer contours of the contact area between the sealing ring and the pull-out piece in the radial direction of the sealing ring.

[0084] In some other embodiments of the present disclosure, as shown in Figures 19 and 20, the sealing ring is sleeved onto the conductive pillar, the flanged edge is disposed on the outer circumferential surface of the conductive pillar, the flanged edge is connected to the pull piece, and at least a portion of the sealing ring is sandwiched between the flanged edge and the inner wall of the cell casing. It should be noted that when the sealing ring is clamped between the inner wall of the cell casing and the flanged edge, d2 can be understood as the distance between two axially opposite surfaces of the sealing ring. One of the two surfaces is the surface of the sealing ring that contacts the inner wall of the cell casing, and the other is the surface of the sealing ring that contacts the flanged edge.

[0085] That is, the inner end of the sealing ring does not abut the pull piece, but abuts the flanged edge of the conductive pillar. In particular, the sealing ring includes a first sealing ring 151 and a second sealing ring 152. The first sealing ring 151 is sleeved to the positive electrode conductive pillar. A portion of the first sealing ring 151 extends into the via hole 102 of the first plate member 111, and another portion of the first sealing ring 151 is sandwiched between the positive electrode conductive pillar flanged edge 131e of the positive electrode conductive pillar and the first plate member 111. The second sealing ring 152 is sleeved to the negative electrode conductive pillar. A portion of the second sealing ring 152 extends into the via hole 102 of the second plate member 112, and another portion of the second sealing ring 152 is sandwiched between the negative electrode conductive pillar flanged edge 132e of the negative electrode conductive pillar and the second plate member 112.

[0086] In some embodiments of the present disclosure, a spacer ring is disposed between the drawer piece and the cell casing 110. The conductive pillar and the sealing ring extend through the spacer ring. The inner end of the conductive pillar is connected to the drawer piece, and the inner end of the sealing ring abuts the drawer piece. The sealing ring is sleeved on the outer circumferential surface of the conductive pillar, and the sealing ring together with the conductive pillar can be inserted into the via hole of the cell casing 110 through which the conductive pillar extends. Moreover, the sealing ring does not need to enter the via hole. The sealing ring can ensure that the conductive pillar does not move in the radial direction of the via hole, avoiding contact between the conductive pillar and the inner peripheral wall of the via hole.

[0087] In particular, a portion of the inner end of the sealing ring engages a stepped portion on the spacer ring to limit radial movement of the sealing ring and the conductive pillar via hole, and another portion of the inner end of the sealing ring abuts the pull piece.

[0088] In some embodiments of the present disclosure, the spacer ring includes a support member and an insulating member connected to the support member, the inner and outer ends of which abut against the electrode core 120 and the cell casing 110 of the battery 100, respectively. The insulating member fits with the pull-out piece and is disposed between the pull-out piece and the cell casing 110.

[0089] The structure of the insulating member and the pull-out piece may be roughly the same, for example, both are "L" shaped. The insulating member includes an insulating member vertical plate and an insulating member horizontal plate connected together. The pull-out piece includes a first connecting sheet and a second connecting sheet connected together. The insulating member vertical plate can be disposed between the first connecting sheet and one side plate of the casing, and the insulating member horizontal plate can be disposed between the second connecting sheet and one side plate of the casing.

[0090] In some embodiments of the present disclosure, the battery casing 110 is constructed as an aluminum alloy part, and the plate thickness of the lower casing and the plate thickness of the sixth plate member 116 are in the range of 0.2 mm to 0.5 mm. Due to the low hardness of the aluminum alloy member, in order to ensure the structural strength of the battery casing 110, the lower casing and the sixth plate member 116 are set to have a large plate thickness.

[0091] In some other embodiments of the present disclosure, the battery casing 110 is configured as a stainless steel part or a nickel-plated steel part, and the plate thickness of the lower casing and the plate thickness of the sixth plate member 116 are in the range of 0.05 mm to 0.2 mm. Due to the high hardness of the stainless steel part or the nickel-plated steel part, on the premise of ensuring the structural strength of the battery casing 110, in order to reduce the manufacturing cost of the battery casing 110, the lower casing and the sixth plate member 116 are set to have a relatively small plate thickness.

[0092] It should be noted that the plate thickness of the lower casing is the plate thickness of any one of the first plate member 111, the second plate member 112, the third plate member 113, the fourth plate member 114 and the fifth plate member 115.

[0093] As shown in Figs. 16 to 18, the positive electrode lead piece 141 and the negative electrode lead piece 142 are disposed inside the battery casing 110, and the positive electrode lead piece 141 and the negative electrode lead piece 142 are connected to the positive electrode tab and the negative electrode tab of the electrode core 120, respectively. The positive electrode lead piece 141 includes a positive electrode first connection sheet 141a, and the negative electrode lead piece 142 includes a negative electrode first connection sheet 142a. The positive electrode first connection sheet 141a and the negative electrode first connection sheet 142a are distributed to two opposing ends of the electrode core 120 along the length direction of the battery casing 110. The distance between the positive electrode first connection sheet 141a and the negative electrode first connection sheet 142a in the length direction of the battery casing 110 is L1, the size of the battery 100 in the length direction of the battery casing 110 is L, and L1 and L satisfy 0.95 ≦ L1 / L ≦ 0.99. It should be understood that the positive electrode first connection sheet 141a has a first surface facing the negative electrode first connection sheet 142a, and the negative electrode first connection sheet 142a has a second surface facing the positive electrode first connection sheet 141a. In the length direction of the battery casing 110, the distance between the first surface of the positive electrode first connection sheet 141a and the second surface of the negative electrode first connection sheet 142a is L1. The battery casing 110 has a first surface and a second surface facing each other in its length direction, and the distance between the first surface and the second surface of the battery casing 110 in the length direction of the battery casing 110 is L. It should be noted that the length direction of the battery casing 110 coincides with the length direction of the battery 100.

[0094] In some embodiments, the positive electrode lead piece 141 includes a connected positive electrode second connection sheet 141b and a connected positive electrode first connection sheet 141a, and the negative electrode lead piece 142 includes a connected negative electrode second connection sheet 142b and a connected negative electrode first connection sheet 142a, so that "L1" in the present disclosure is the distance between the inner surface of the positive electrode first connection sheet 141a and the inner surface of the negative electrode first connection sheet 142a in the longitudinal direction of the battery casing 110.

[0095] L1 and L satisfy 0.95≦L1 / L≦0.99, which ensures that the positive electrode lead piece 141 and the negative electrode lead piece 142 have sufficient conductivity and do not occupy too much of the space inside the battery casing 110, particularly the space in the longitudinal direction of the battery casing 110.

[0096] In some embodiments of the present disclosure, the thickness of positive electrode first connection sheet 141a is in the range of 0.6 mm to 2 mm, and the thickness of negative electrode first connection sheet 142a is in the range of 0.6 mm to 2 mm. The thickness of positive electrode first connection sheet 141a refers to the size of positive electrode first connection sheet 141a in the length direction of the battery casing, and the thickness of negative electrode first connection sheet 142a refers to the size of negative electrode first connection sheet 142a in the length direction of the battery casing.

[0097] Positive electrode lead piece 141 may be L-shaped and may be an integral member, and negative electrode lead piece 142 may be L-shaped and may be an integral member. The thickness of positive electrode lead piece 141 may be the thickness of positive electrode first connection sheet 141a. The thickness of negative electrode lead piece 142 may be the thickness of negative electrode first connection sheet 142a. This is because the thickness of positive electrode first connection sheet 141a and the thickness of negative electrode first connection sheet 142a affect the degree of occupancy of positive electrode lead piece 141 and negative electrode lead piece 142 in the space in the length direction of battery casing 110. Therefore, the thickness of positive electrode lead piece 141 is specified in the range of 0.6 mm to 2 mm, and the thickness of negative electrode lead piece 142 is specified in the range of 0.6 mm to 2 mm. This prevents positive electrode lead piece 141 and negative electrode lead piece 142 from occupying too much space in battery casing 110, particularly in the length direction of battery casing 110. Therefore, for a battery of the same size, the capacity of the battery is improved. The positive electrode conductive pillar 131 is disposed on the first plate member 111, and the negative electrode conductive pillar 132 is disposed on the second plate member 112. However, the positive electrode conductive pillar 131 does not have direct contact with the first plate member 111, and the negative electrode conductive pillar 132 does not have direct contact with the second plate member 112.

[0098] The positive electrode first connection sheet 141a is parallel to the first plate member 111 and is connected to the positive electrode conductive pillar 131. The negative electrode first connection sheet 142a is parallel to the second plate member 112 and is connected to the negative electrode conductive pillar 132. In the length direction of the battery casing 110, the distance between the inner surface of the positive electrode first connection sheet 141a and the inner surface of the negative electrode first connection sheet 142a is "L1".

[0099] In some embodiments, the electrode core 120 has opposing first and second end faces. A positive electrode tab of the electrode core 120 is led out from the first end face, and a negative electrode tab of the electrode core 120 is led out from the second end face. The distance between the first end face of the electrode core 120 and the positive electrode first connection sheet 141a is in the range of 2 to 12 mm in the length direction of the battery casing 110. The distance between the second end face of the electrode core 120 and the negative electrode first connection sheet 142a is in the range of 2 to 12 mm in the length direction of the battery casing 110.

[0100] The battery casing 110 further includes a third plate member 113 and a fourth plate member 114 directly facing each other in the width direction. The distance between the inner surface of the third plate member 113 and the inner surface of the fourth plate member 114 is H1 in the width direction of the battery casing 110, and the size of the battery 100 is H in the width direction of the battery casing 110, where H1 and H satisfy 0.92≦H1 / H≦0.98. This ensures that the battery casing 110 has sufficient strength due to the plate thickness of the third plate member 113 and the fourth plate member 114, and prevents the narrowed internal space of the battery casing 110 caused by the excessive plate thickness of the third plate member 113 and the fourth plate member 114 from affecting the capacity of the battery 100. It should be noted that the width direction of the battery casing 110 coincides with the width direction of the battery 100.

[0101] In some embodiments of the present disclosure, the battery casing 110 further includes a fifth plate member 115 and a sixth plate member 116 directly facing each other in the thickness direction. The distance between the inner surface of the fifth plate member 115 and the inner surface of the sixth plate member 116 is D1 in the thickness direction of the battery casing 110, and the size of the battery 100 is D in the thickness direction of the battery casing 110, where L>H>D, and D1 and D satisfy 0.93≦D1 / D≦0.99. Therefore, the thickness of the fifth plate member 115 and the sixth plate member 116 is not too large, so that if the volume of the battery casing 110 is constant, the fifth plate member 115 and the sixth plate member 116 are prevented from occupying too much space in the battery casing 110. Moreover, the constant thickness of the fifth plate member 115 and the sixth plate member 116 can also ensure that the battery casing 110 has sufficient structural strength. It should be noted that the thickness direction of the battery casing 110 coincides with the thickness direction of the battery 100 .

[0102] The positive electrode second connection sheet 141b is connected to the positive electrode first connection sheet 141a and extends to the inside of the battery casing 110. The negative electrode second connection sheet 142b is connected to the negative electrode first connection sheet 142a and extends to the inside of the battery casing 110. The positive electrode second connection sheet 141b and the negative electrode second connection sheet 142b are both parallel to the fifth plate member 115 and the sixth plate member 116. In particular, both the positive electrode second connection sheet 141b and the negative electrode second connection sheet 142b are attached to the inner surface of the fifth plate member 115.

[0103] The battery according to an embodiment of the present disclosure includes a lower casing and an upper casing. The upper casing and the lower casing can be connected by welding. After the lower casing and the upper casing are fixed to each other, the upper casing and the lower casing define a receiving space for receiving the electrode core 120.

[0104] According to some embodiments of the present disclosure, the lower casing includes a first plate member 111 and a second plate member 112, the first plate member 111 and the second plate member 112 being directly opposite one another in a length direction of the battery 100; a third plate member 113 and a fourth plate member 114, the third plate member 113 and the fourth plate member 114 being directly opposite one another in a width direction of the battery 100; and a third plate member 113 and a fourth plate member 114, the third plate member 113 and the fourth plate member 114 being directly opposite one another in a width direction of the battery 100. a third plate member 113 and a fourth plate member 114 connected to one end of the first plate member 111 and the second plate member 112 on the same side in the width direction of the battery 100, respectively, and a fifth plate member 115, the peripheral portion of which is connected to one end of the first plate member 111, the second plate member 112, the third plate member 113 and the fourth plate member 114 on the same side in the thickness direction of the battery 100. The first plate member 111, the second plate member 112, the third plate member 113 and the fourth plate member 114 are configured as a peripheral side wall of the lower casing. Therefore, the opening of the lower casing is very large so that the electrode core 120 can be conveniently installed in the battery casing 110 , thereby improving the installation efficiency of the battery 100 .

[0105] Furthermore, the first plate member 111, the second plate member 112, the third plate member 113, the fourth plate member 114, and the fifth plate member 115 are an integral part. The lower casing can be integrally formed by stamping the plates. Therefore, the formation efficiency of the lower casing is greatly improved, and the structural strength of the lower casing is also enhanced. The upper casing is configured as a sixth plate member 116, and the sixth plate member 116 and the fifth plate member 115 directly face each other in the thickness direction of the battery 100.

[0106] A battery pack according to the present disclosure includes a battery casing 110, an electrode core 120, a puller piece, and a spacer ring.

[0107] 1 to 15, a storage space is provided in the battery casing 110, and the electrode core 120 and the pull-out piece are disposed in the battery casing 110. The pull-out piece is connected to a tab of the electrode core 120, a part of the spacer ring is sandwiched between the pull-out piece and the battery casing 110, and another part of the spacer ring is sandwiched between an end of the electrode core 120 and the battery casing 110.

[0108] That is, the spacer ring of the present disclosure can not only separate the pull-out piece from the battery casing 110 to avoid short circuit caused by contact between the pull-out piece and the battery casing 110, but also abut the two ends of the electrode core 120 to prevent the electrode core 120 from moving in one direction within the battery casing 110, thereby improving the stability of the electrode core. Therefore, it is ensured that the tabs arranged on the electrode core 120 do not move, and the connection stability between the tabs and the pull-out piece is also improved.

[0109] In some embodiments of the present disclosure, the spacer ring includes a support member and an insulating member coupled to the support member. The support member is sandwiched between the end of the electrode core 120 and the cell casing 110. The insulating member fits with the puller piece and is sandwiched between the puller piece and the cell casing 110. In fact, not only is the insulating member itself an insulating member, but the support member is also an insulating member. The support member and the insulating member may be an integral part.

[0110] The two ends of the support member can abut against the ends of the electrode core 120 and the inner wall of the battery casing 110, respectively. The insulating member fits with the drawer piece, and is sandwiched between the drawer piece and the battery casing 110, so as to avoid electrical leakage caused by direct contact between the drawer piece and the battery casing 110.

[0111] Furthermore, the pull-out piece may be "L" shaped and includes a first connecting sheet and a second connecting sheet. The first connecting sheet and the second connecting sheet are connected. The first connecting sheet is parallel to the side plate of the battery casing 110 in the length direction, and the second connecting sheet and the second connecting sheet are parallel to the side plate of the battery casing 110 in the thickness direction.

[0112] The insulating member is also "L" shaped and includes an insulating member vertical plate and an insulating member horizontal plate. The insulating member vertical plate and the insulating member horizontal plate are connected. The insulating member vertical plate is disposed between the first connecting sheet and one of the side plates of the battery casing 110 in the length direction, and the insulating member horizontal plate is disposed between the second connecting sheet and one of the side plates of the battery casing 110 in the thickness direction.

[0113] The size of the support member in the length direction of the battery casing 110 is larger than the size of the insulating member vertical plate in the length direction of the battery casing 110. The support member protrudes toward the center of the battery casing 110 relative to the insulating member vertical plate. Therefore, the support member can abut against the end of the electrode core 120, and therefore the end of the electrode core 120 does not abut against the insulating member vertical plate.

[0114] It should be appreciated that the L-shaped drawer piece may be positioned inside the L-shaped insulating member so that the insulating member completely surrounds the drawer piece to avoid direct contact with the battery casing 110.

[0115] Furthermore, the outer side surface of the support member is flush with the outer side surface of the insulating member vertical plate, and the inner surface of the support member is flush with the inner end of the insulating member horizontal plate. In other words, the dimension of the support member protruding inward from the insulating member vertical plate is the dimension in the length direction of the insulating member horizontal plate. When the second connection sheet of the insulating member horizontal plate is overlapped and connected to the tab of the electrode core 120, the support member abuts against the end of the electrode core 120 in the length direction.

[0116] In some embodiments of the present disclosure, the insulating member vertical plate is provided with an electrolyte solution infiltration through hole 101 and a via hole through which a conductive pillar extends. The conductive pillar extends through the via hole of the insulating member and is connected to the first connection sheet. The electrolyte solution infiltration through hole 101 provided in the insulating member can facilitate the injection of the electrolyte solution into the battery casing 110. In addition, the gas in the battery casing 110 can also be exhausted through the electrolyte solution infiltration through hole 101. It should be understood that the electrolyte solution infiltration through hole 101 is directly opposite the explosion-proof valve of the battery 100 and the electrolyte solution infusion hole on the battery casing 110 in the length direction of the battery casing 110.

[0117] In some embodiments of the present disclosure, the cell casing 110 includes a first plate member 111 and a second plate member 112 that are directly opposite each other along the length of the cell casing 110, a third plate member 113 and a fourth plate member 114 that are directly opposite each other along the width of the cell casing 110, and a fifth plate member 115 and a sixth plate member 116 that are directly opposite each other along the thickness of the cell casing 110. The first plate member 111, the second plate member 112, the third plate member 113, the fourth plate member 114, and the fifth plate member 115 define a lower casing having an open end. The sixth plate member 116 is secured to the lower casing to close the open end.

[0118] The lead pieces include a positive electrode lead piece 141 and a negative electrode lead piece 142. The positive electrode lead piece 141 is connected to the positive electrode conductive pillar 131 and the positive electrode tab of the electrode core 120, respectively. The negative electrode lead piece 142 is connected to the negative electrode conductive pillar 132 and the negative electrode tab of the electrode core 120, respectively.

[0119] The spacer ring includes a first insulating spacer ring 161 and a second insulating spacer ring 162. A spacer ring vertical plate of the first insulating spacer ring 161 is disposed between the first plate member 111 and the first connecting sheet of the positive electrode lead piece 141. A spacer ring horizontal plate of the first insulating spacer ring 161 is disposed between the fifth plate member 115 and the second connecting sheet of the positive electrode lead piece 141. A spacer ring vertical plate of the second insulating spacer ring 162 is disposed between the second plate member 112 and the first connecting sheet of the negative electrode lead piece 142. A spacer ring horizontal plate of the second insulating spacer ring 162 is disposed between the fifth plate member 115 and the second connecting sheet of the negative electrode lead piece 142.

[0120] The electrode core 120 is directly placed in the lower casing, and then the tab and the lead piece are welded by laser welding, electric resistance welding, or other welding methods. The lead piece is designed to be L-shaped, which is convenient for welding with the tab. After the electrode core 120 is placed in the battery casing, the tab can be overlapped with the lead piece in a natural and straight state and then welded together, so as to avoid the risk of the positive electrode and the negative electrode contacting each other after the tab is bent, shorten the size of the tab, improve the utilization rate of the metal current collector, improve the process yield, and reduce the product cost.

[0121] The upper casing (sixth plate member 116) is assembled after the tabs of the electrode core 120 are welded to the lead piece of the lower casing. After the upper and lower casings are assembled, the upper and lower casings are hermetically bonded at the edges by laser welding or roll sealing, and the upper and lower casings form a sealed body.

[0122] After the battery casing 110 is assembled, the electrolyte solution can be injected through the electrolyte solution injection hole. After the injection is completed, the electrolyte solution injection hole needs to be sealed by welding a metal sheet or by a plastic nail. The explosion-proof valve of the battery 100 is disposed on the first plate member 111 or the second plate member 112, and one or more explosion-proof valves can be disposed on the first plate member 111 or the second plate member 112.

[0123] The explosion-proof valve is formed by laser scribing or directly punching the side plate of the battery casing 110, or a hole of the same shape and size as the explosion-proof valve is punched into the battery casing 110 and then the explosion-proof valve is welded to the battery casing 110.

[0124] According to some embodiments of the present disclosure, the drawer piece is "L" shaped, and the second connecting sheet is connected to the side edge of the first connecting sheet and extends inside the casing. The second connecting sheet extending inside the casing can be attached to the tabs and welded, so that the tabs do not bend too much and the tabs are fairly flat during and after welding.

[0125] In some other embodiments of the present disclosure, the drawer piece is "T" shaped, and the second connection sheet is connected to the middle area of ​​the first connection sheet and extends inside the battery casing 110. Since the T-shaped drawer piece has a second connection sheet that also extends inside the casing, the tab can also be welded flat with the second connection sheet, and the tab will not bend too much, which greatly improves the connection stability between the tab and the drawer piece. Some of the multiple tabs can be welded to one side in the thickness direction of the second connection sheet, and other tabs of the multiple tabs can be welded to the other side in the thickness direction of the second connection sheet.

[0126] The first connecting sheet may be parallel to the first plate member 111 and the second plate member 112, and the conductive pillars may extend through the first plate member 111 or the second plate member 112 and are connected to the first connecting sheet.

[0127] The conductive pillars include a positive electrode conductive pillar 131 and a negative electrode conductive pillar 132. The lead pieces include a positive electrode lead piece 141 and a negative electrode lead piece 142. The positive electrode conductive pillar 131 extends through the first plate member 111 and is connected to a first connection sheet of the positive electrode lead piece 141. The negative electrode conductive pillar 132 extends through the second plate member 112 and is connected to a first connection sheet of the negative electrode lead piece 142. Meanwhile, the second connection sheet is parallel to the fifth plate member 115 or the sixth plate member 116.

[0128] It should be noted that in the battery 100 of the present disclosure, the conductive pillars include a positive electrode conductive pillar 131 and a negative electrode conductive pillar 132, the lead pieces include a positive electrode lead piece 141 and a negative electrode lead piece 142, and the tabs include a positive electrode tab and a negative electrode tab. The positive electrode lead piece 141 includes a positive electrode first connection sheet 141a and a positive electrode second connection sheet 141b. The negative electrode lead piece 142 includes a negative electrode first connection sheet 142a and a negative electrode second connection sheet 142b.

[0129] The spacer ring is disposed between the drawer piece and the battery casing 110, and the conductive pillar extends through the drawer piece and is connected to the spacer ring. The spacer ring can prevent direct contact between the drawer piece and the battery casing 110, so that the presence of a charged battery casing 110 can be avoided and the safety performance of the battery 100 can be improved.

[0130] In some embodiments of the present disclosure, the spacer ring includes a support member and an insulating member coupled to the support member. The support member is sandwiched between the end of the electrode core 120 and the cell casing 110. The insulating member fits with the puller piece and is sandwiched between the puller piece and the cell casing 110. In fact, not only is the insulating member itself an insulating member, but the support member is also an insulating member. The support member and the insulating member may be an integral part.

[0131] The insulating member is also "L" shaped and includes an insulating member vertical plate and an insulating member horizontal plate. The insulating member vertical plate and the insulating member horizontal plate are connected. The insulating member vertical plate is disposed between the first connecting sheet and one of the side plates of the battery casing 110 in the length direction, and the insulating member horizontal plate is disposed between the second connecting sheet and one of the side plates of the battery casing 110 in the thickness direction.

[0132] A battery pack 1000 according to one embodiment of the present disclosure is briefly described below.

[0133] 37, a battery pack 1000 according to an embodiment of the present disclosure includes the above-mentioned battery 100. Since the battery 100 is disposed in the battery pack 1000 according to the embodiment of the present disclosure, the safety performance of the battery pack 1000 is high, and the output of the battery pack 1000 is further increased.

[0134] A vehicle 10000 according to one embodiment of the present disclosure is briefly described below.

[0135] 38, a vehicle 10000 according to an embodiment of the present disclosure includes the above-mentioned battery pack 1000. Since the battery pack 1000 is disposed in the vehicle 10000 according to an embodiment of the present disclosure, the battery life of the vehicle 10000 is greatly improved, and the electrical safety performance of the vehicle 10000 is also greatly improved.

[0136] In addition, as shown in Figure 39, in another embodiment of the present disclosure, a vehicle 10000 includes the above-mentioned battery 100. By arranging the battery 100 according to the above embodiment, the battery life of the vehicle 10000 is improved, and the electrical safety performance of the vehicle 10000 is also significantly improved.

[0137] In the description of the specification, references to terms such as "one embodiment," "some embodiments," "exemplary embodiments," "examples," "specific examples," or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the disclosure. In this specification, illustrative descriptions of such terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0138] Although the embodiments of the present disclosure have been illustrated and described above, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present disclosure, and the scope of the present disclosure is as defined by the appended claims and their equivalents. [Explanation of symbols]

[0139] 10000 vehicles 1000 Battery Packs 100 batteries 110 Battery casing 111 first plate member 112 second plate member 113 Third plate member 114 Fourth plate member 115 Fifth plate member 116 Sixth Plate Component 120 Electrode Core 131 Positive electrode conductive pillar 131a first positive electrode conductive pillar 131b second positive electrode conductive pillar 131c First connecting piece 131d First insulating plate 131e Positive electrode conductive pillar flanged edge 132 Negative electrode conductive pillar 132a first negative electrode conductive pillar 132b second negative electrode conductive pillar 132c Second connecting piece 132d Second insulating plate 132e Negative electrode conductive pillar flanged edge 141 Positive electrode lead piece 141a Positive electrode first connection sheet 141b Positive electrode second connection sheet 142 Negative electrode lead piece 142a Negative electrode first connection sheet 142b Negative electrode second connection sheet 151 First sealing ring 152 Second sealing ring 161 First insulating spacer ring 161a first support member 161b First insulating member vertical plate 161c first insulating member horizontal plate 162 Second insulating spacer ring 162a second support member 162b Second insulating member vertical plate 162c Second insulating member horizontal plate 101 Electrolyte solution infiltration hole 102 Via hole

Claims

1. A battery casing (110); a drawer piece and a conductive pillar, the drawer piece being disposed within the battery casing (110), the battery casing (110) being provided with a via hole through which the conductive pillar extends, the conductive pillar being connected to the drawer piece; A sealing ring, the sealing ring being hermetically connected between the conductive pillar and the battery casing (110), the sealing ring being configured as an elastic piece, the initial size of the sealing ring in the axial direction of the sealing ring is d1, and the size of the sealing ring after axial compression is d2, d1 and d2 satisfy 0.5≦d2 / d1≦0.9, and d1 and d2 are both in mm. A battery (100).

2. 2. The battery (100) of claim 1, wherein the sealing ring is sleeved onto the conductive pillar and at least a portion of the sealing ring is sandwiched between an inner wall of the battery casing (110) and the pull-out piece.

3. 3. The battery (100) of claim 1 or 2, wherein the sealing ring is sleeved onto the conductive pillar, a flanged edge is disposed on an outer peripheral surface of the conductive pillar, the flanged edge is connected to the pull piece, and at least a portion of the sealing ring is sandwiched between the flanged edge and the inner wall of the battery casing (110).

4. 4. The battery (100) of claim 1, wherein after the sealing ring is axially compressed, a width of a contact area between the sealing ring and the inner wall surface of the battery casing (110) is W, and W satisfies 1.2 mm≦W≦2.5 mm.

5. 3. The battery (100) of claim 2, wherein the width of the contact area between the sealing ring and the pull piece is W, where W satisfies 1.2 mm≦W≦2.5 mm.

6. the lead piece comprises a positive electrode lead piece (141) and a negative electrode lead piece (142), the conductive pillar comprises a positive electrode conductive pillar (131) and a negative electrode conductive pillar (132); 6. The battery (100) of claim 1, wherein the battery casing (110) comprises a first plate member (111) and a second plate member (112) directly opposite each other in a longitudinal direction, the positive electrode conductive pillar (131) extending through the first plate member (111) and connected to the positive electrode lead piece (141), and the negative electrode conductive pillar (132) extending through the second plate member (112) and connected to the negative electrode lead piece (142).

7. The cell casing (110) further comprises a third plate member (113) and a fourth plate member (114) directly opposed to each other in a width direction, and a fifth plate member (115) and a sixth plate member (116) directly opposed to each other in a thickness direction; 7. The battery (100) of claim 6, wherein the first plate member (111), the second plate member (112), the third plate member (113), the fourth plate member (114) and the fifth plate member (115) are formed as a lower casing having a lateral opening, and the sixth plate member (116) is fixedly connected to the lower casing so as to close an open end of the lower casing.

8. 8. The battery (100) of claim 7, wherein the cell casing (110) is constructed as an aluminum alloy component and the plate thickness of the lower casing and the plate thickness of the sixth plate member (116) are in the range of 0.2 mm to 0.5 mm, or the cell casing (110) is constructed as a stainless steel or nickel-plated steel component and the plate thickness of the lower casing and the plate thickness of the sixth plate member (116) are in the range of 0.05 mm to 0.2 mm.

9. A battery pack (1000) comprising a battery (100) according to any one of claims 1 to 8.

10. A vehicle (10000) comprising a battery (100) according to any one of claims 1 to 8 or a battery pack (1000) according to claim 9.

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