Battery, battery pack, and vehicle

Abstract

Battery, battery pack, and vehicle. The battery includes a battery casing, a pole core disposed within the battery casing, a positive electrode lead piece, and a negative electrode lead piece. The positive electrode lead piece includes a first connection sheet of the positive electrode, and the negative electrode lead piece includes a first connection sheet of the negative electrode. The first connection sheet of the positive electrode and the first connection sheet of the negative electrode are distributed at two opposing ends of the pole core in the length direction of the battery casing. The distance between the first connection sheet of the positive electrode and the first connection sheet of the negative electrode in the length direction of the battery casing is L1, the size of the battery in the length direction of the battery casing is L, and L1 and L satisfy 0.95 ≦ L1 / L ≦ 0.99.

Description

Technical Field

[0001] Cross - reference to related applications This disclosure claims the priority of Chinese Patent Application No. 202221134789.6, entitled "Battery, battery pack and vehicle", filed on May 12, 2022, which is incorporated herein by reference in its entirety.

[0002] Technical Field This disclosure relates to the technical field of batteries, and specifically to batteries, battery packs, and vehicles.

Background Art

[0003] A lead - out piece inside the battery is connected between the conductive post and the tab of the electrode core. The lead - out piece includes a positive - electrode lead - out piece and a negative - electrode lead - out piece. Since both the positive - electrode lead - out piece and the negative - electrode lead - out piece are arranged inside the casing, they occupy the internal space inside the battery casing. In the batteries of the prior art, since the distance between the positive - electrode lead - out piece and the negative - electrode lead - out piece is small, the size of the electrode core located between the positive - electrode lead - out piece and the negative - electrode lead - out piece becomes small, and thus the capacity of the battery as a whole is reduced.

Summary of the Invention

Means for Solving the Problems

[0004] This disclosure aims to solve at least one of the technical problems in the prior art. For this purpose, the object of this disclosure is to provide a battery. The battery ensures that the positive - electrode lead - out piece and the negative - electrode lead - out piece have sufficient conductivity and do not excessively occupy the space inside the battery casing, especially the space in the length direction of the battery casing.

[0005] This disclosure further provides a battery pack having the battery.

[0006] This disclosure further provides a vehicle having the battery.

[0007] The battery according to the present disclosure includes a battery casing, an electrode core disposed within the battery casing, a positive electrode lead-out piece disposed within the battery casing and connected to the positive electrode tab of the electrode core, and a negative electrode lead-out piece disposed within the battery casing and connected to the negative electrode tab of the electrode core. The positive electrode lead-out piece includes a first connection sheet of the positive electrode, and the negative electrode lead-out piece includes a first connection sheet of the negative electrode. The first connection sheet of the positive electrode and the first connection sheet of the negative electrode are distributed at two opposite ends of the electrode core along the length direction of the battery casing. The distance between the first connection sheet of the positive electrode and the first connection sheet of the negative electrode in the length direction of the battery casing is L1, the size of the battery in the length direction of the battery casing is L, and L1 and L satisfy 0.95 ≦ L1 / L ≦ 0.99.

[0008] According to the battery of the present disclosure, by setting L1 and L so as to satisfy 0.95 ≦ L1 / L ≦ 0.99, it is ensured that the positive electrode lead-out piece and the negative electrode lead-out piece have sufficient conductivity and do not excessively occupy the space inside the battery casing, particularly the space in the length direction of the battery casing.

[0009] According to an embodiment of the present disclosure, the thickness of the first connection sheet of the positive electrode and the first connection sheet of the negative electrode is in the range of 0.6 mm to 2 mm.

[0010] According to an embodiment of the present disclosure, the electrode core has opposing first and second end faces. The positive electrode tab of the electrode core is drawn out from the first end face, and the negative electrode tab of the electrode core is drawn out from the second end face. The distance between the first end face of the electrode core and the first connection sheet of the positive electrode is in the range of 2 mm to 12 mm in the length direction of the battery casing. The distance between the second end face of the electrode core and the first connection sheet of the negative electrode is in the range of 2 mm to 12 mm in the length direction of the battery casing.

[0011] According to an embodiment of the present disclosure, the battery casing includes a first plate material and a second plate material that directly face each other in the longitudinal direction. A positive electrode conductive post is disposed on the first plate material, and a negative electrode conductive post is disposed on the second plate material. The inner end of the positive electrode conductive post is connected to the first connection sheet of the positive electrode, and the inner end of the negative electrode conductive post is connected to the first connection sheet of the negative electrode.

[0012] According to an embodiment of the present disclosure, the first connection sheet of the positive electrode is parallel to the first plate material and is connected to the positive electrode conductive post. The first connection sheet of the negative electrode is parallel to the second plate material and is connected to the negative electrode conductive post. The distance between the inner surface of the first connection sheet of the positive electrode and the inner surface of the first connection sheet of the negative electrode is "L1".

[0013] According to an embodiment of the present disclosure, the battery casing further includes a third plate material and a fourth plate material that directly face each other in the width direction. The distance between the inner surface of the third plate material and the inner surface of the fourth plate material in the width direction of the battery casing is H1, and the size of the battery in the width direction of the battery casing is H. H1 and H satisfy 0.92 ≤ H1 / H ≤ 0.98, where both H1 and H are in mm units.

[0014] According to an embodiment of the present disclosure, the battery casing further includes a fifth plate material and a sixth plate material that directly face each other in the thickness direction. The distance between the inner surface of the fifth plate material and the inner surface of the sixth plate material in the thickness direction of the battery casing is D1, and the size of the battery in the thickness direction of the battery casing is D. Here, L > H > D, and D1 and D satisfy 0.93 ≤ D1 / D ≤ 0.99, where both D1 and D are in mm units.

[0015] According to an embodiment of the present disclosure, the first plate material, the second plate material, the third plate material, the fourth plate material, and the fifth plate material define a lower casing having an opening on the side surface, and the sixth plate material is fixedly connected to the lower casing so as to close the opening end of the lower casing.

[0016] According to an embodiment of the present disclosure, the positive electrode lead-out piece is connected to the first connection sheet of the positive electrode, and further includes a second connection sheet of the positive electrode that extends inwardly within the battery casing. The positive electrode lead-out piece is connected to the positive electrode tab of the electrode core by the second connection sheet of the positive electrode. The negative electrode lead-out piece is connected to the first connection sheet of the negative electrode, and further includes a second connection sheet of the negative electrode that extends inwardly within the battery casing. The negative electrode lead-out piece is connected to the negative electrode tab of the electrode core by the second connection sheet of the negative electrode.

[0017] The battery pack according to the present disclosure includes a battery.

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

[0019] Other aspects and advantages of the present disclosure are given in the following description, and some of them will become apparent from the following description or can be learned from the practice of the present disclosure.

[0020] The above and / or other further aspects and advantages of the present disclosure will become apparent and understandable from the description of the embodiments related to the accompanying drawings.

Brief Description of the Drawings

[0021]

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Explanation of symbols

[0022] 100 Battery 110 Battery casing 111 First plate material 112 Second plate material 113 Third plate material 114 Fourth plate material 115 Fifth plate material 116 Sixth plate material 120 Electrode core 131 Positive electrode conductive column 131a First positive electrode conductive column 131b Second positive electrode conductive column 131c First connection piece 131d First insulating plate 131e Positive electrode conductive column flange edge 132 Negative electrode conductive column 132a First negative electrode conductive column 132b Second negative electrode conductive column 132c Second connection piece 132d Second insulating plate 132e Negative electrode conductive column flange edge 141 Positive electrode lead-out piece 141a First connection sheet of the positive electrode 141b Second connection sheet of the positive electrode 142 Negative electrode lead-out piece 142a First connection sheet of the negative electrode 142b Second connection sheet of the negative electrode 151 First sealing ring 152 Second sealing ring 161 First insulating spacer ring 161a First support member 161b First vertical plate of the insulating member 161c First horizontal plate of the insulating member 162 Second insulating spacer ring 162a Second support member 162b Second vertical plate of the insulating member 162c Second horizontal plate of the insulating member 101 Through hole for electrolyte penetration 102 Via hole

Best Mode for Carrying Out the Invention

[0023] Embodiments of the present disclosure are described in detail below, and examples of the embodiments are shown in the accompanying drawings. Throughout the description, elements having the same or similar elements or the same or similar functions are denoted by the same or similar reference numerals. The examples described below with reference to the accompanying drawings are illustrative and are used only to explain the present disclosure and should not be construed as a limitation of the present disclosure.

[0024] The battery 100 according to an embodiment of the present disclosure is described below with reference to FIGS. 1 to 36.

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

[0026] The electrode core 120 is disposed inside the battery casing 110, and the conductive column extends through the battery casing 110 such that the inner end of the conductive column is connected to the electrode core 120, and the outer end of the conductive column extends out of the battery casing 110. Specifically, the inner end of the conductive column is connected to the tab of the electrode core 120. Further, the conductive column has a cross-sectional area of s, the battery has a capacity of C, and s and C satisfy the relational expression: C / s ≤ 8, where s is in mm 2 units and C is in Ah units.

[0027] It can be understood that the size of the cross-sectional area of the conductive column represents the current-carrying capacity of the conductive column. As the cross-sectional area of the conductive column increases, the current-carrying capacity of the conductive column increases. Further, the minimum cross-sectional area on the conductive column determines the current-carrying capacity of the conductive column. The cross-section of the conductive column is a plane perpendicular to the direction in which the current flows. When the conductive column is a cylinder and the direction in which the current flows through the conductive column is the axial direction of the conductive column, the cross-section of the conductive column is a circular radial cross-section. When the conductive column adopts a variable cross-section design, the cross-sectional area of the conductive column can be understood as the area of the minimum cross-section on the conductive column.

[0028] After extensive experiments and discussions, the inventors of the present disclosure have found that when the relational expression C / s ≤ 8 is satisfied, the current-carrying capacity of the conductive posts of the battery 100 can be guaranteed, and the temperature during the use of the battery 100 does not exceed the operating temperature range of the battery 100 due to the large heat generation caused by the small current-carrying area, ensuring that the battery 100 does not suffer from thermal safety problems.

[0029] In some embodiments of the present disclosure, the cross-sectional area s of the conductive post and the battery capacity C satisfy the relational expression: 6 / 5 ≤ C / s ≤ 8. The inventors have found that the ratio of the battery capacity C to the cross-sectional area s of the conductive post is desirably as small as possible without being undesirable. If the ratio is too small, the size of the conductive post becomes too large, resulting in a redundant design.

[0030] In some embodiments of the present disclosure, the conductive post includes a positive conductive post 131 and a negative conductive post 132. The cross-sectional area s1 of the positive conductive post 131 and the battery capacity C satisfy the relational expression: 6 / 5 ≤ C / s1 ≤ 16 / 3, and the cross-sectional area s2 of the negative conductive post 132 and the battery capacity C satisfy the relational expression: 6 / 5 ≤ C / s2 ≤ 8, where both s1 and s2 are in mm 2 units. When the positive conductive post 131 includes a plurality of positive electrode posts extending through the battery casing 110 and connected to the positive electrode tab of the electrode core 120, it can be understood that the cross-sectional area s1 of the positive conductive post 131 is the sum of the cross-sectional areas of the plurality of positive electrode posts. When the positive electrode post adopts a variable cross-section design, the cross-sectional area of the positive electrode post can be understood as the area of the minimum cross-section on the positive electrode post. When the negative conductive post 132 includes a plurality of negative electrode posts 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 conductive post 132 is the sum of the cross-sectional areas of the plurality of negative electrode posts. When the negative electrode post adopts a variable cross-section design, the cross-sectional area of the negative electrode post can be understood as the area of the minimum cross-section on the negative electrode post.

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

[0032] It should be noted that the positive electrode conductive post 131 of the battery 100 can be made of aluminum, and the negative electrode conductive post 132 can be made of copper. However, the conductivity of aluminum and copper is different. For the same cross-sectional area, the current-carrying capacity of copper is greater than that of aluminum. Therefore, in order to ensure that the positive electrode conductive post 131 and the negative electrode conductive post 132 have the same current-carrying capacity, the negative electrode conductive post 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 post and the cross-sectional area s2 of the negative electrode conductive post are in the range of 12 mm 2 ~ 315 mm 2 and the battery capacity C is in the range of 30 Ah to 400 Ah.

[0034] In Table 1 below, descriptions are made in relation to the comparative example (i.e., the prior art) and Examples 1 to 8 (examples of the present disclosure). Under the same operating conditions, the batteries in the comparative example and Examples 1 to 8 are charged at a rate of 2C respectively, and the temperature rise curves of the positive electrode conductive column 131 and the negative electrode conductive column 132 are recorded. The cross-sectional area s1 of the positive electrode conductive column 131, the cross-sectional area s2 of the negative electrode conductive column 132, and the total battery capacity C in the comparative example and Examples 1 to 8 are selected from the data in Table 1 below. FIG. 21 shows the temperature rise curves of the positive electrode conductive column 131 and the negative electrode conductive column 132 in the comparative example and Example 1. FIG. 22 shows the temperature rise curves of the positive electrode conductive column 131 and the negative electrode conductive column 132 in the comparative example and Example 2. FIG. 23 shows the temperature rise curves of the positive electrode conductive column 131 and the negative electrode conductive column 132 in the comparative example and Example 3. FIG. 24 shows the temperature rise curves of the positive electrode conductive column 131 and the negative electrode conductive column 132 in the comparative example and Example 4. FIG. 25 shows the temperature rise curves of the positive electrode conductive column 131 and the negative electrode conductive column 132 in the comparative example and Example 5. FIG. 26 shows the temperature rise curves of the positive electrode conductive column 131 and the negative electrode conductive column 132 in the comparative example and Example 6. FIG. 27 shows the temperature rise curves of the positive electrode conductive column 131 and the negative electrode conductive column 132 in the comparative example and Example 7. FIG. 28 shows the temperature rise curves of the positive electrode conductive column 131 and the negative electrode conductive column 132 in the comparative example and Example 8.

Table 1

[0035] After many experiments, the comparison results between the current-carrying capacity of the conductive columns of the present disclosure and that of the prior art were obtained by the inventors as shown in FIGS. 21 to 28.

[0036] Compared with the comparative example, the temperature rise of the positive electrode conductive column 131 and the negative electrode conductive column 132 in Examples 1 to 8 is relatively low, thus ensuring that the battery is in a good operating state.

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

[0038] The negative electrode conductive column 132 includes a first negative electrode conductive column 132a, a second negative electrode conductive column 132b, and a second connection piece 132c. Both the first negative electrode conductive column 132a and the second negative electrode conductive column 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 column 132a and the second negative electrode conductive column 132b. The cross-sectional area s2 of the negative electrode conductive column 132 is the sum of the cross-sectional area of the first negative electrode conductive column 132a and the cross-sectional area of the second negative electrode conductive column 132b.

[0039] The first connection piece 131c is connected between the outer ends of the first positive electrode conductive column 131a and the second positive electrode conductive column 131b to increase the contact area between the first positive electrode conductive column 131a and the second positive electrode conductive column 131b, enabling the positive electrode conductive column 131 to be more conveniently connected to the outside. The second connection piece 132c is connected between the outer ends of the first negative electrode conductive column 132a and the second negative electrode conductive column 132b to increase the contact area between the first negative electrode conductive column 132a and the second negative electrode conductive column 132b, enabling the negative electrode conductive column 132 to be more conveniently 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 waist-shaped cross-section, and the first negative electrode conductive pillar 132a and the second negative electrode conductive pillar 132b have a circular or waist-shaped cross-section. When the size of the battery casing 110 in the thickness direction is large, 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 can be used. However, when the size of the battery casing 110 in the thickness direction is small, 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 waist-shaped cross-section can be used. In this way, 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, but it is ensured that the positive electrode conductive pillar 131 and the negative electrode conductive pillar 132 have sufficient current-carrying capacity.

[0041] In some embodiments of the present disclosure, as shown in FIGS. 1 to 4 and FIGS. 15 to 20, the battery casing 110 includes a first plate member 111 and a second plate member 112 that directly face each other in the length direction of the battery 100, a third plate member 113 and a fourth plate member 114 that directly face each other in the width direction of the battery 100, and a fifth plate member 115 and a sixth plate member 116 that directly face 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 respectively connected to one end and the other end on the same side of the third plate member 113 and the fourth plate member 114 in the length direction of the battery 100. The fifth plate member 115 and the sixth plate member 116 are respectively connected to one end and the other end on the same side of the third plate member 113 and the fourth plate member 114 in the length direction of the battery 100.

[0043] The positive electrode conductive column 131 is arranged on the first plate material 111, and the negative electrode conductive column 132 is arranged on the second plate material 112. A first insulating plate 131d is arranged between the first plate material 111 and the first connection piece 131c, and a second insulating plate 132d is arranged between the second plate material 112 and the second connection piece 132c, so that the electrical connection between the first connection piece 131c and the battery casing 110 and the electrical connection between the second connection piece 132c and the battery casing 110 are effectively avoided.

[0044] Furthermore, the first plate material 111 is provided with a first via hole for the first positive electrode conductive column 131a to extend therethrough, and a second via hole for the second positive electrode conductive column 131b to extend therethrough. The second plate material 112 is provided with a third via hole for the first negative electrode conductive column 132a to extend therethrough, and a fourth via hole for the second negative electrode conductive column 132b to extend therethrough.

[0045] The battery casing 110 also has a positive electrode lead-out piece 141 and a negative electrode lead-out piece 142 arranged inside. The positive electrode lead-out piece 141 is connected to the positive electrode tab of the electrode core 120, and the positive electrode lead-out piece 141 is also connected to the positive electrode conductive column 131. The negative electrode lead-out piece 142 is connected to the negative electrode tab of the electrode core 120, and the negative electrode lead-out piece 142 is also connected to the negative electrode conductive column 132.

[0046] As shown in FIGS. 9 and 10, a first sealing ring 151 is put on the positive electrode conductive column 131, and the first sealing ring 151 is sandwiched between the positive electrode lead-out piece 141 and the first plate member 111. A second sealing ring 152 is put on the negative electrode conductive column 132, and the second sealing ring 152 is sandwiched between the negative electrode lead-out piece 142 and the second plate member 112. Therefore, the positive electrode conductive column 131 is restricted by the first sealing ring 151. As a result, the positive electrode conductive column 131 does not contact the inner wall surface of the via hole on the first plate member 111 extending therethrough. The negative electrode conductive column 132 is restricted by the second sealing ring 152. As a result, the negative electrode conductive column 132 does not contact the inner wall surface of the via hole on the second plate member 112 extending therethrough.

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

[0048] A second insulating spacer ring 162 is also arranged between the negative electrode lead-out piece 142 and the second plate member 112. The negative electrode conductive column 132 extends through the second insulating spacer ring 162 and is connected to the negative electrode lead-out piece 142. The second insulating spacer ring 162 is an insulating member. By using the second insulating spacer ring 162, the contact between the negative electrode lead-out piece 142 and the battery casing 110 can be avoided, and thus the safety performance of the battery 100 is improved.

[0049] Furthermore, on the outer surface of the first insulating spacer ring 161, a first stepped portion that fits with the inner end of the first sealing ring 151 is arranged. The first stepped portion can limit the movement of the first sealing ring 151 and the positive electrode conductive post 131, and avoid direct contact between the positive electrode conductive post 131 and the battery casing 110. On the outer surface of the second insulating spacer ring 162, a second stepped portion that fits with the inner end of the second sealing ring 152 is arranged. The second stepped portion can limit the movement of the second sealing ring 152 and the negative electrode conductive post 132, and avoid direct contact between the negative electrode conductive post 132 and the battery casing 110.

[0050] It can be seen that a part of the inner end of the positive electrode conductive post 131 fits with the stepped portion on the first insulating spacer ring 161, and the other part of the positive electrode conductive post 131 abuts against the positive electrode lead piece 141. A part of the inner end of the negative electrode conductive post 132 fits with the stepped portion on the second insulating spacer ring 162, and the other part of the negative electrode conductive post 132 abuts against the negative electrode lead piece 142.

[0051] In some embodiments of the present disclosure, the sizes of the first insulating member vertical plate 161b and the second insulating member vertical plate 162b are in the range of 0.3 mm to 1.5 mm in the length direction of the battery casing. This is to 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 to make the space occupied in the length direction within the battery casing 110 as small as possible. When 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, resulting in insufficient insulation. When the thickness is greater than 1.5 mm, excessive space within the battery casing 110 is occupied, thereby reducing the space utilization rate and affecting the designed capacity of the battery 100. Therefore, after many inspections and adjustments by the inventors of the present disclosure, the sizes 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 are determined to be in the range of 0.3 mm to 1.5 mm.

[0052] As shown in FIGS. 11 to 12, the first insulating spacer ring 161 includes a first support member 161a and a first insulating member connected to the first support member 161a. The inner end and the outer end of the first support member 161a are respectively in contact with the electrode core 120 of the battery 100 and the first plate member 111. The first insulating member is fitted with the positive electrode lead-out piece 141 and is disposed between the positive electrode lead-out piece 141 and the battery casing 110. The second insulating spacer ring 162 includes a second support member 162a and a second insulating member connected to the second support member 162a. The inner end and the outer end of the second support member 162a are respectively in contact with the end of the electrode core 120 and the second plate member 112. The second insulating member is fitted with the negative electrode lead-out piece 142 and is disposed between the negative electrode lead-out 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 first connection sheet 141a of the positive electrode and the first plate member 111, and the first insulating member horizontal plate 161c is disposed between the second connection sheet 141b of the positive electrode and one side plate 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 first connection sheet 142a of the negative electrode and the second plate member 112, and the second insulating member horizontal plate 162c is disposed between the second connection sheet 142b of the negative electrode and one side plate 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 on the side surface, and the sixth plate member 116 is fixedly connected to the lower casing so as to close the opening end of the lower casing. Therefore, the electrode core 120 does not need to enter the battery casing 110 through a narrow passage, but enters the battery casing 110 through a very wide opening end, so that the installation cost is greatly reduced and the installation time is saved.

[0055] Specifically, the first insulating member horizontal plate 161c is disposed between the second connection sheet 141b of the positive electrode and the fifth plate member 115, and the second insulating member horizontal plate 162c is disposed between the second connection sheet 142b of the negative electrode 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 within the battery casing 110 and prevent the movement of the electrode core 120 within the battery casing 110.

[0057] In some embodiments of the present disclosure, the outer end surface of the positive electrode conductive post 131 extends from the battery casing and has a distance in the range of 2 mm to 5 mm to the outer side surface of the first plate member 111. The outer end surface of the negative electrode conductive post 132 extends from the battery casing and has a distance in the range of 2 mm to 5 mm to the outer side surface of the second plate member 112. Therefore, both the positive electrode conductive post 131 and the negative electrode conductive post 132 have sufficient protrusions for connection to an external electrical device, and it is ensured that they do not occupy excessive space in the length direction when the overall length of the battery 100 is clear, and thus it is ensured that the battery 100 has sufficient capacity.

[0058] In the battery 100 according to the embodiment of the present disclosure, both the electrode core 120 and the lead-out piece are disposed within the battery casing 110. The lead-out piece is connected to the electrode core 120. Specifically, the lead-out piece is connected to the tab of the electrode core 120. The conductive post extends through the battery casing 110. The inner end of the conductive post is connected to the lead-out piece, and the outer end of the conductive post extends from the battery casing 110. In this way, charging and discharging of the electrode core 120 can be realized by the conductive post.

[0059] Cross-sectional area of ​​the pull-out piece s lead and the battery capacity C is expressed by the relation C / s lead ≦15. Note that the cross-sectional area of ​​the draw-out piece determines the current-passing capacity of the draw-out piece. Therefore, in this relationship, the current-passing capacity of the draw-out piece is expressed as the ratio of the battery capacity to the cross-sectional area of ​​the draw-out piece. The cross-section of the draw-out piece is a plane perpendicular to the direction in which the current flows, or a plane perpendicular to the thickness direction of the draw-out piece. When the draw-out piece adopts a variable cross-sectional design, the cross-sectional area of ​​the draw-out piece is the minimum cross-sectional area on the draw-out piece.

[0060] After extensive testing, the inventors of the present disclosure have found that when the relationship is satisfied, the current passing capacity of the pull-out piece can be guaranteed, and it can be ensured that the temperature of the pull-out piece during use of the battery 100 will not suffer from large heat generation caused by a small current passing area, the temperature distribution inside the battery 100 will not be affected, the internal temperature of the battery 100 will not exceed the temperature range for using the battery 100, and the thermal safety issue of the battery 100 will not be incurred.

[0061] Furthermore, the cross-sectional area s of the pull-out piece lead And the battery capacity C is expressed by the relation 2≦C / s lead ≦15. Therefore, it is further ensured that the pull-out piece has a sufficient current-passing capacity. lead It has been found that the ratio of battery capacity C to the battery capacity C is undesirably as small as possible. If the ratio is too small, the size of the pull-out piece will be too large, resulting in a redundant design and occupying too much space in the battery.

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

[0063] The cross-sectional area s of the positive electrode lead-out piece 141 positive lead and the battery capacity C satisfy the relational expression 5 ≤ C / s positive lead ≤ 12. The cross-sectional area s of the negative electrode lead-out piece 142 negative lead and the battery capacity C satisfy the relational expression 6 ≤ C / s negative lead ≤ 15. The positive electrode lead-out piece 141 may be an aluminum sheet, and the negative electrode lead-out piece 142 may be a copper sheet. Given the same cross-sectional area, the current-carrying capacity of the aluminum sheet is smaller than that of the copper sheet. On the premise that the positive electrode lead-out piece 141 and the negative electrode lead-out piece 142 have the same current-carrying capacity, the cross-sectional area of the copper sheet is reduced.

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

[0065] In Table 2 below, descriptions are made in relation to the comparative example (i.e., the prior art) and Examples 1 to 8 (embodiments of the present disclosure). Under the same operating conditions, the batteries in the comparative example and Examples 1 to 8 are charged at a rate of 2C respectively, and the temperature rise curves of the positive electrode lead-out piece 141 and the negative electrode lead-out piece 142 are recorded. The cross-sectional area s of the positive electrode lead-out piece 141 in the comparative example and Examples 1 to 8positive 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 is a diagram showing the temperature rise curves of the positive electrode lead piece 141 and the negative electrode lead piece 142 in the proportionality example and Example 1. FIG. 30 is a diagram showing the temperature rise curves of the positive electrode lead piece 141 and the negative electrode lead piece 142 in the proportionality example and Example 2. FIG. 31 is a diagram showing the temperature rise curves of the positive electrode lead piece 141 and the negative electrode lead piece 142 in the proportionality example and Example 3. FIG. 32 is a diagram showing the temperature rise curves of the positive electrode lead piece 141 and the negative electrode lead piece 142 in the proportionality example and Example 4. FIG. 33 is a diagram showing the temperature rise curves of the positive electrode lead piece 141 and the negative electrode lead piece 142 in the proportionality example and Example 5. FIG. 34 is a diagram showing the temperature rise curves of the positive electrode lead piece 141 and the negative electrode lead piece 142 in the proportionality example and Example 6. FIG. 35 is a diagram showing the temperature rise curves of the positive electrode lead piece 141 and the negative electrode lead piece 142 in the proportionality example and Example 7. FIG. 36 is a diagram showing the temperature rise curves of the positive electrode lead piece 141 and the negative electrode lead piece 142 in the proportionality example and Example 8.

Table 2

[0066] Compared with the proportionality example, the temperature rises of the positive electrode lead piece 141 and the negative electrode lead piece 142 in Examples 1 to 8 are relatively low, and thus it is guaranteed that the battery is in a good operating state.

[0067] Furthermore, as shown in FIGS. 13 to 14, the positive electrode lead piece 141 and the negative electrode lead piece 142 have the same structure and include a connected first connection sheet and a second connection sheet. The second connection sheet of the positive electrode lead piece 141 directly faces the fifth plate material 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 material 111 and is connected to the positive electrode conductive column 131. The second connection sheet of the negative electrode lead piece 142 directly faces the fifth plate material 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 material 112 and is connected to the negative electrode conductive column 132. For the sake of simplicity, the first connection sheet of the positive electrode lead piece 141 is designated as the first connection sheet 141a of the positive electrode, and the second connection sheet of the positive electrode lead piece 141 is designated as the second connection sheet 141b of the positive electrode. Similarly, the first connection sheet of the negative electrode lead piece 142 is designated as the first connection sheet 142a of the negative electrode, and the second connection sheet of the negative electrode lead piece 142 is designated as the second connection sheet 142b of the negative electrode.

[0068] In some embodiments of the present disclosure, the first connection sheet 141a of the positive electrode and the first connection sheet 142a of the negative electrode have sizes 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 material 111 and a second plate material 112 that directly face each other in the length direction. The first connection sheet of the positive electrode lead piece 141 is parallel to the first plate material 111, and the first connection sheet of the negative electrode lead piece 142 is parallel to the second plate material 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 post 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 post 132 extends through the second insulating spacer ring 162 and is connected to the negative electrode lead piece 142. In this way, direct contact between the positive electrode lead piece 141 and the negative electrode lead piece 142 and the battery casing 110 can be avoided, and thus the safety performance of the battery 100 is improved.

[0071] At least a part 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 part 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. That is, the first insulating spacer ring 161 can not only separate the positive electrode lead piece 141 from the first plate member 111, but also separate the positive electrode lead piece 141 from the fifth plate member 115. The second insulating spacer ring 162 can not only separate the negative electrode lead piece 142 from the second plate member 112, but also separate 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 connected to the first support member 161a. The inner end and the outer end of the first support member 161a are respectively in contact with the end of the electrode core 120 of the battery 100 and the first plate member 111. The first insulating member is fitted 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 connected to the second support member 162a. The inner end and the outer end of the second support member 162a are respectively in contact with the end of the electrode core 120 of the battery 100 and the second plate member 112. 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 first connection sheet 141a of the positive electrode and the first plate member 111, and the first insulating member horizontal plate 161c is disposed between the second connection sheet 141b of the positive electrode 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 first connection sheet 142a of the negative electrode and the second plate member 112, and the second insulating member horizontal plate 162c is disposed between the second connection sheet 142b of the negative electrode 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 against one end 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 against the other end of the electrode core 120. Therefore, the first support member 161a and the second support member 162a can abut against the electrode core 120 together in the length direction of the battery casing 110 to avoid the movement of the electrode core 120 in the length direction of the battery casing 110.

[0075] Specifically, the first insulating member vertical plate 161b is disposed between the first connection sheet 141a of the positive electrode and the first plate member 111, and the first insulating member horizontal plate 161c is disposed between the second connection sheet 141b of the positive electrode and the fifth plate member 115. The second insulating member vertical plate 162b is disposed between the first connection sheet 142a of the negative electrode and the second plate member 112, and the second insulating member horizontal plate 162c is disposed between the second connection sheet 142b of the negative electrode 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 is disposed inside the first insulating member and can be 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 is disposed inside the second insulating spacer ring and can be attached thereto.

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

[0078] As a result, this 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 occupies as small a space as possible in the length direction within the battery casing 110. When the thickness is less than 0.3 mm, when the tab is welded to the lead piece, the welding heat may melt the spacer ring, resulting in insufficient insulation. When the thickness is greater than 1.5 mm, excessive space within the battery casing 110 is occupied, thereby reducing the space utilization rate and affecting the designed 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 post and the battery casing 110. The sealing ring is configured as an elastic member, and the sealing ring is an insulating member for effectively electrically insulating the lead piece from the battery casing 110. The initial size of the sealing ring in its axial direction is d1, the size of the sealing ring after axial compression is d2, and d1 and d2 satisfy 0.5 ≦ d2 / d1 ≦ 0.9, where d1 and d2 are both in mm units.

[0080] In some embodiments, the sealing ring is sleeved on the conductive post and switched between the inner wall of the battery casing 110 and the lead-out piece. It should be noted that the initial size d1 of the sealing ring in its axial direction can be understood as the axial dimension of the sealing ring after being released from compression and elastically restored (d1 is the distance between two axially opposed end faces of the restored sealing ring). When the sealing ring is clamped between the inner wall of the battery casing and the lead-out piece, d2 can be understood as the distance between two axially opposed faces of the sealing ring. One of the two faces is the face of the sealing ring in contact with the inner wall of the battery casing, and the other is the face of the sealing ring in contact with the lead-out piece.

[0081] The initial size of the sealing ring in its axial direction is the axial size of the sealing ring before compression. After the sealing ring is compressed, the axial size of the sealing ring decreases. By defining the ratio of the size after compression to the initial size of the sealing ring, it is ensured that the sealing ring has a certain amount of compression, which facilitates the installation of the lead-out piece and the conductive post setting spacer ring, and ensures the sealing performance between the lead-out piece and the battery casing 110 and the sealing performance between the conductive post and the sealing ring. Moreover, if the size of the battery is the same, the capacity of the battery is improved.

[0082] Since the axial size of the sealing ring becomes smaller after being compressed, the radial size naturally becomes larger. Both axial sides of the sealing ring are annular. The outer end in the axial direction of the sealing ring contacts the inner wall surface of the battery casing 110. The inner end in the axial direction of the sealing ring contacts the lead-out piece. Thereby, both axial ends of the sealing ring are sandwiched between the battery casing 110 and the lead-out piece.

[0083] The width of at least one of the contact area between the sealing ring and the inner wall surface of the battery casing 110 and the contact area between the sealing ring and the lead-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 lead-out piece are guaranteed. 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 the 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 lead-out piece can be understood as the distance between the two outer contours of the contact area between the sealing ring and the lead-out piece in the radial direction of the sealing ring.

[0084] In some other embodiments of the present disclosure, as shown in FIGS. 19 and 20, the sealing ring is covered on the conductive post, a flange edge is disposed on the outer peripheral surface of the conductive post, the flange edge is connected to the lead-out piece, and at least a part of the sealing ring is sandwiched between the flange edge and the inner wall of the battery casing. It should be noted that when the sealing ring is clamped between the inner wall of the battery casing and the flange edge, d2 can be understood as the distance between the two axially opposing surfaces of the sealing ring. One of the two surfaces is the surface of the sealing ring that contacts the inner wall of the battery casing, and the other is the surface of the sealing ring that contacts the flange edge.

[0085] That is, the inner end of the sealing ring does not contact the lead-out piece, but contacts the flange edge of the conductive column. Specifically, the sealing ring includes a first sealing ring 151 and a second sealing ring 152. The first sealing ring 151 is put on the positive electrode conductive column. A part of the first sealing ring 151 extends into the via hole 102 of the first plate 111, and the other part of the first sealing ring 151 is sandwiched between the positive electrode conductive column flange edge 131e of the positive electrode conductive column and the first plate 111. The second sealing ring 152 is put on the negative electrode conductive column. A part of the second sealing ring 152 extends into the via hole 102 of the second plate 112, and the other part of the second sealing ring 152 is sandwiched between the negative electrode conductive column flange edge 132e of the negative electrode conductive column and the second plate 112.

[0086] In some embodiments of the present disclosure, a spacer ring is disposed between the lead-out piece and the battery casing 110. The conductive column and the sealing ring extend through the spacer ring. The inner end of the conductive column is connected to the lead-out piece, and the inner end of the sealing ring contacts the lead-out piece. The sealing ring is put on the outer peripheral surface of the conductive column, and the sealing ring, together with the conductive column, can be inserted into a via hole on the battery casing 110 for the conductive column to extend through. Moreover, the sealing ring may not enter the via hole. The sealing ring can ensure that the conductive column does not move in the radial direction of the via hole to avoid its contact with the inner peripheral wall of the via hole.

[0087] Specifically, a part of the inner end of the sealing ring fits with a stepped portion on the spacer ring to limit the movement of the sealing ring and the conductive column in the radial direction of the via hole, and the other part of the inner end of the sealing ring contacts the lead-out 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 end and the outer end of the support member contact the electrode core 120 of the battery 100 and the battery casing 110 respectively. The insulating member fits with the lead-out piece and is disposed between the lead-out piece and the battery casing 110.

[0089] The structures of the insulating member and the lead-out piece can be substantially the same. For example, they can both be "L"-shaped. The insulating member includes a connected insulating member vertical plate and an insulating member horizontal plate. The lead-out piece includes a connected first connection sheet and a second connection sheet. The insulating member vertical plate can be disposed between the first connection sheet and one side plate of the casing, and the insulating member horizontal plate can be disposed between the second connection sheet and one side plate of the casing.

[0090] In some embodiments of the present disclosure, the battery casing 110 is configured 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. Due to the low hardness of the aluminum alloy component, the lower casing and the sixth plate member 116 are set to have a large plate thickness so as to ensure the structural strength of the battery casing 110.

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

[0092] Note 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 first connection sheet 141a of the positive electrode, and the negative electrode lead piece 142 includes a first connection sheet 142a of the negative electrode. The first connection sheet 141a of the positive electrode and the first connection sheet 142a of the negative electrode are distributed to two opposing ends of the electrode core 120 along the length direction of the battery casing 110. The distance between the first connection sheet 141a of the positive electrode and the first connection sheet 142a of the negative electrode 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. The first connection sheet 141a of the positive electrode has a first surface facing the first connection sheet 142a of the negative electrode, and it can be seen that the first connection sheet 142a of the negative electrode has a second surface facing the first connection sheet 141a of the positive electrode. The distance between the first surface of the first connection sheet 141a of the positive electrode and the second surface of the first connection sheet 142a of the negative electrode in the length direction of the battery casing 110 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, since the positive electrode lead piece 141 includes the connected second connection sheet 141b of the positive electrode and the first connection sheet 141a of the positive electrode, and the negative electrode lead piece 142 includes the connected second connection sheet 142b of the negative electrode and the first connection sheet 142a of the negative electrode, "L1" in the present disclosure is the distance between the inner surface of the first connection sheet 141a of the positive electrode and the inner surface of the first connection sheet 142a of the negative electrode in the length direction of the battery casing 110.

[0095] L1 and L satisfy 0.95 ≦ L1 / L ≦ 0.99, whereby the positive electrode lead piece 141 and the negative electrode lead piece 142 have sufficient conductivity, and it is ensured that the positive electrode lead piece 141 and the negative electrode lead piece 142 do not overly occupy the space inside the battery casing 110, particularly the space in the length direction of the battery casing 110.

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

[0097] The positive electrode lead piece 141 is L-shaped and can be an integral member, and the negative electrode lead piece 142 is L-shaped and can be an integral member. The thickness of the positive electrode lead piece 141 may be the thickness of the first connection sheet 141a of the positive electrode. The thickness of the negative electrode lead piece 142 may be the thickness of the first connection sheet 142a of the negative electrode. This is because the thickness of the first connection sheet 141a of the positive electrode and the thickness of the first connection sheet 142a of the negative electrode affect the occupied range of the positive electrode lead piece 141 and the negative electrode lead piece 142 in the space in the length direction of the battery casing 110. Therefore, the thickness of the positive electrode lead piece 141 is defined in the range of 0.6 mm to 2 mm, and the thickness of the negative electrode lead piece 142 is defined in the range of 0.6 mm to 2 mm. Thereby, it is ensured that the positive electrode lead piece 141 and the negative electrode lead piece 142 do not overly occupy the space inside the battery casing 110, particularly the space in the length direction of the battery casing 110. Therefore, if the battery sizes are the same, the battery capacity is improved. The positive electrode conductive post 131 is disposed on the first plate member 111, and the negative electrode conductive post 132 is disposed on the second plate member 112. However, the positive electrode conductive post 131 does not directly contact the first plate member 111, and the negative electrode conductive post 132 does not directly contact the second plate member 112.

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

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

[0100] The battery casing 110 includes a third plate material 113 and a fourth plate material 114 that directly face each other in the width direction. The distance between the inner surface of the third plate material 113 and the inner surface of the fourth plate material 114 is H1 in the width direction of the battery casing 110, the size of the battery 100 is H in the width direction of the battery casing 110, and H1 and H satisfy 0.92 ≤ H1 / H ≤ 0.98. Thereby, the plate thicknesses of the third plate material 113 and the fourth plate material 114 enable the battery casing 110 to have sufficient strength, and it is ensured that a decrease in the internal space within the battery casing 110 that affects the capacity of the battery 100 due to an overly large plate thickness of the third plate material 113 and the fourth plate material 114 is prevented. 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 that directly face 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 in the thickness direction of the battery casing 110 is D1, and the size of the battery 100 in the thickness direction of the battery casing 110 is D, where L > H > D, and D1 and D satisfy 0.93 ≤ D1 / D ≤ 0.99. Therefore, since the thicknesses of the fifth plate member 115 and the sixth plate member 116 do not become too large, if the volume of the battery casing 110 is determined, the fifth plate member 115 and the sixth plate member 116 are prevented from occupying excessive space within the battery casing 110. Moreover, a certain 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 second connection sheet 141b of the positive electrode is connected to the first connection sheet 141a of the positive electrode and extends inwardly within the battery casing 110. The second connection sheet 142b of the negative electrode is connected to the first connection sheet 142a of the negative electrode and extends inwardly within the battery casing 110. The second connection sheet 141b of the positive electrode and the second connection sheet 142b of the negative electrode are both parallel to the fifth plate member 115 and the sixth plate member 116. Specifically, both the second connection sheet 141b of the positive electrode and the second connection sheet 142b of the negative electrode are attached to the inner surface of the fifth plate member 115.

[0103] A 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 together, the upper casing and the lower casing define an accommodation space for accommodating 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, where the first plate member 111 and the second plate member 112 directly face each other in the length direction of the battery 100, a third plate member 113 and a fourth plate member 114, where the third plate member 113 and the fourth plate member 114 directly face each other in the width direction of the battery 100, the third plate member 113 is respectively connected to one end on the same side of the first plate member 111 and the second plate member 112 in the width direction of the battery 100, and the fourth plate member 114 is respectively connected to the other end on the same side of the first plate member 111 and the second plate member 112 in the width direction of the battery 100, and a peripheral portion of a fifth plate member 115, where the fifth plate member 115 is respectively connected to one end on the same side of the first plate member 111, the second plate member 112, the third plate member 113, and the fourth plate member 114 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 the peripheral side walls of the lower casing. Therefore, the opening of the lower casing is very large, and thus 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 integral parts. The lower casing can be integrally formed by punching a plate. Therefore, the forming 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] The battery pack according to the present disclosure includes a battery casing 110, an electrode core 120, a lead-out piece, and a spacer ring.

[0107] As shown in FIGS. 1 to 15, a housing space is provided in the battery casing 110, and the electrode core 120 and the lead-out piece are arranged inside the battery casing 110. The lead-out piece is connected to the tab of the electrode core 120. A part of the spacer ring is sandwiched between the lead-out piece and the battery casing 110, and the other part of the spacer ring is sandwiched between the end of the electrode core 120 and the battery casing 110.

[0108] That is, the spacer ring of the present disclosure not only separates the lead-out piece from the battery casing 110 in order to avoid a short circuit caused by contact between the lead-out piece and the battery casing 110, but also abuts against both ends of the electrode core 120 to prevent the electrode core 120 from moving in one direction inside the battery casing 110, thereby improving the stability of the electrode core. Therefore, it is ensured that the tab arranged on the electrode core 120 does not move, and the connection stability between the tab and the lead-out piece is also improved.

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

[0110] Both ends of the support member abut against the end of the electrode core 120 and the inner wall of the battery casing 110 respectively. The insulating member fits with the lead-out piece and is also sandwiched between the lead-out piece and the battery casing 110 in order to avoid leakage caused by direct contact between the lead-out piece and the battery casing 110.

[0111] Furthermore, the lead-out piece can be in an "L" shape and includes a first connection sheet and a second connection sheet. The first connection sheet and the second connection sheet are connected. The first connection sheet is parallel to the side plate of the battery casing 110 in the length direction, and the first connection sheet and the second connection sheet are parallel to the side plate of the battery casing 110 in the thickness direction.

[0112] The insulating member is also in an "L" shape 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 connection sheet and the side plate of the battery casing 110 in the length direction, and the insulating member horizontal plate is disposed between the second connection sheet and one side plate 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 more than the insulating member vertical plate. Therefore, the support member can abut against the end of the electrode core 120, and as a result, the end of the electrode core 120 does not abut against the insulating member vertical plate.

[0114] It can be seen that the "L"-shaped lead-out piece can be disposed inside the "L"-shaped insulating member, and as a result, the insulating member can completely surround the lead-out piece to avoid its direct contact with the battery casing 110.

[0115] Furthermore, the outer surface of the support member is at the same height as the outer surface of the insulating member vertical plate, and the inner surface of the support member is at the same height as the inner end of the insulating member horizontal plate. That is, the dimension by which the support member protrudes inward more than the insulating member vertical plate is the dimension in the length direction of the insulating member horizontal plate. When the second connection sheet on the insulating member horizontal plate is overlapped and connected with the tab of the electrode core 120, the support member abuts against the end in the length direction of the electrode core 120.

[0116] In some embodiments of the present disclosure, the insulating member vertical plate includes a through hole 101 for the electrolyte to penetrate and a via hole for the conductive column to extend through. The conductive column extends through the via hole on the insulating member and is connected to the first connection sheet. The penetration of the electrolyte into the through hole 101 provided in the insulating member can facilitate the injection of the electrolyte into the battery casing 110. Moreover, the gas inside the battery casing 110 can also be discharged through the electrolyte penetrating the through hole 101. It can be seen that the electrolyte penetrating the through hole 101 directly faces the explosion-proof valve and the electrolyte injection hole of the battery 100 on the battery casing 110 in the length direction of the battery casing 110.

[0117] In some embodiments of the present disclosure, the battery casing 110 includes a first plate 111 and a second plate 112 that directly face each other in the length direction of the battery casing 110, a third plate 113 and a fourth plate 114 that directly face each other in the width direction of the battery casing 110, and a fifth plate 115 and a sixth plate 116 that directly face each other in the thickness direction of the battery casing 110. The first plate 111, the second plate 112, the third plate 113, the fourth plate 114, and the fifth plate 115 define a lower casing having an open end. The sixth plate 116 is fixed to the lower casing so as to close the open end.

[0118] The lead-out piece includes a positive electrode lead-out piece 141 and a negative electrode lead-out piece 142. The positive electrode lead-out piece 141 is respectively connected to the positive electrode conductive column 131 and the positive electrode tab of the electrode core 120. The negative electrode lead-out piece 142 is respectively connected to the negative electrode conductive column 132 and the negative electrode tab of the electrode core 120.

[0119] The spacer ring includes a first insulating spacer ring 161 and a second insulating spacer ring 162. Between the first plate material 111 and the first connection sheet of the positive electrode lead-out piece 141, the spacer vertical plate of the first insulating spacer ring 161 is arranged. Between the fifth plate material 115 and the second connection sheet of the positive electrode lead-out piece 141, the spacer horizontal plate of the first insulating spacer ring 161 is arranged. Between the second plate material 112 and the first connection sheet of the negative electrode lead-out piece 142, the spacer vertical plate of the second insulating spacer ring 162 is arranged. Between the fifth plate material 115 and the second connection sheet of the negative electrode lead-out piece 142, the spacer horizontal plate of the second insulating spacer ring 162 is arranged.

[0120] The electrode core 120 is directly installed in the lower casing, and then the tabs and lead-out pieces are welded by laser welding, electric resistance welding, or other welding methods. The lead-out piece is designed to be L-shaped, which is convenient for welding with the tab. After the electrode core 120 is arranged in the battery casing, the tab can be overlapped with the lead-out piece in a natural straight state and then welded together, thus avoiding the risk of contact between the positive and negative electrodes after the tab is bent, shortening the tab size, improving the utilization rate of the metal current collector, improving the process yield, and reducing the product cost.

[0121] After the tab of the electrode core 120 is welded to the lead-out piece of the lower casing, the upper casing (the sixth plate material 116) is assembled. After the upper casing and the lower casing are assembled, the upper casing and the lower casing are hermetically connected at the edges by laser welding or roll sealing, and as a result, the upper casing and the lower casing form a sealed body.

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

[0123] The explosion-proof valve is formed on the side plate of the battery casing 110 by laser scoring or direct punching, or a hole with the same shape and size as the explosion-proof valve is punched in the battery casing 110, and then the explosion-proof valve is welded onto the battery casing 110.

[0124] According to some embodiments of the present disclosure, the lead-out piece is in an "L" shape, and the second connection sheet is connected to the side edge of the first connection sheet and extends inwardly within the casing. The second connection sheet extending inwardly within the casing is attached to and can be welded to a plurality of tabs, so that the plurality of tabs are not overly bent and the tabs become quite flat during and after welding.

[0125] In some other embodiments of the present disclosure, the lead-out piece is in a "T" shape, and the second connection sheet is connected to the central region of the first connection sheet and extends inwardly within the battery casing 110. Since the "T"-shaped lead-out piece further has a second connection sheet extending inwardly within the casing, the tabs can be more flatly welded to the second connection sheet, and the tabs are not overly bent, thereby greatly improving the connection stability between the tabs and the lead-out piece. Some of the plurality of tabs can be welded to one side in the thickness direction of the second connection sheet, and other tabs of the plurality of tabs can be welded to the other side in the thickness direction of the second connection sheet.

[0126] The first connection sheet can be parallel to the first plate 111 and the second plate 112, and the conductive post can extend through the first plate 111 or the second plate 112 and is connected to the first connection sheet.

[0127] The conductive posts include a positive conductive post 131 and a negative conductive post 132. The lead-out pieces include a positive lead-out piece 141 and a negative lead-out piece 142. The positive conductive post 131 extends through the first plate 111 and is connected to the first connection sheet of the positive lead-out piece 141. The negative conductive post 132 extends through the second plate 112 and is connected to the first connection sheet of the negative lead-out piece 142. On the other hand, the second connection sheet is parallel to the fifth plate 115 or the sixth plate 116.

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

[0129] The spacer ring is disposed between the lead-out piece and the battery casing 110. The conductive post extends through the lead-out piece and is connected to the spacer ring. The spacer ring can prevent direct contact between the lead-out piece and the battery casing 110, thus avoiding the presence of a charged battery casing 110 and improving the safety performance of the battery 100.

[0130] In some embodiments of the present disclosure, the spacer ring includes a support member and an insulating member connected to the support member. The support member is sandwiched between the end of the electrode core 120 and the battery casing 110. The insulating member fits with the lead-out piece and is sandwiched between the lead-out piece and the battery 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 can be an integral part.

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

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

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

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

[0135] A vehicle according to an embodiment of the present disclosure includes the battery pack described above. Since the battery pack is disposed in the vehicle according to the embodiment of the present disclosure, the battery life of the vehicle is significantly improved, and the electrical safety performance of the vehicle is also significantly improved.

[0136] In the description of this specification, the descriptions referring 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 embodiments or examples are included in at least one embodiment or example of the present disclosure. In this specification, the exemplary descriptions of the foregoing terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more implementation forms.

[0137] Although embodiments of the present disclosure have been illustrated and described above, various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the present disclosure, and those skilled in the art can understand that the scope of the present disclosure is defined by the appended claims and their equivalents.

Claims

1. A battery casing (110) and an electrode core (120), wherein the electrode core (120) is disposed within the battery casing (110), a positive electrode lead piece (141), wherein the positive electrode lead piece (141) is disposed within the battery casing (110) and is connected to the positive electrode tab of the electrode core (120), a negative electrode lead piece (142), wherein the negative electrode lead piece (142) is disposed within the battery casing (110) and is connected to the negative electrode tab of the electrode core (120), a battery (100) comprising: the positive electrode lead piece (141) comprises a first connection sheet (141a) of the positive electrode, the negative electrode lead piece (142) comprises a first connection sheet (142a) of the negative electrode, the first connection sheet (141a) of the positive electrode and the first connection sheet (142a) of the negative electrode are distributed to two opposing ends of the electrode core (120) along the length direction of the battery casing (110), the distance between the first connection sheet (141a) of the positive electrode and the first connection sheet (142a) of the negative electrode 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, L1 and L satisfy 0.95 ≦ L1 / L ≦ 0.99, and both L1 and L are in units of mm, a battery (100).

2. The battery (100) according to claim 1, wherein the thicknesses of the first connection sheet (141a) of the positive electrode and the first connection sheet (142a) of the negative electrode are both in the range of 0.6 mm to 2 mm.

3. The electrode core (120) has first and second end faces facing each other. The positive electrode tab of the electrode core (120) is drawn out from the first end face, and the negative electrode tab of the electrode core (120) is drawn out from the second end face. The distance between the first end face of the electrode core (120) and the first connection sheet (141a) of the positive electrode is in the range of 2 mm 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 first connection sheet (142a) of the negative electrode is in the range of 2 mm to 12 mm in the length direction of the battery casing (110). The battery (100) according to claim 1.

4. The battery casing (110) includes a first plate member (111) and a second plate member (112) directly facing each other in the length direction. A positive electrode conductive post (131) is disposed on the first plate member (111), and a negative electrode conductive post (132) is disposed on the second plate member (112). The inner end of the positive electrode conductive post (131) is connected to the first connection sheet (141a) of the positive electrode, and the inner end of the negative electrode conductive post (132) is connected to the first connection sheet (142a) of the negative electrode. The battery (100) according to claim 1.

5. 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 side surface of the third plate member (113) and the inner side surface of the fourth plate member (114) is H1 in the width direction of the battery casing (110). The size of the battery (100) is H in the width direction of the battery casing (110). H1 and H satisfy 0.92 ≦ H1 / H ≦ 0.98, and both H1 and H are in units of mm. The battery (100) according to claim 4.

6. The battery casing (110) further includes a fifth plate material (115) and a sixth plate material (116) that directly face each other in the thickness direction, the distance between the inner surface of the fifth plate material (115) and the inner surface of the sixth plate material (116) is D1 in the thickness direction of the battery casing (110), the size of the battery (100) is D in the thickness direction of the battery casing (110), L > H > D, D1 and D satisfy 0.93 ≦ D1 / D ≦ 0.99, and both D1 and D are in units of mm. The battery (100) according to claim 5.

7. The first plate material (111), the second plate material (112), the third plate material (113), the fourth plate material (114), and the fifth plate material (115) define a lower casing having an opening on the side, and the sixth plate material (116) is fixedly connected to the lower casing so as to close the opening end of the lower casing. The battery (100) according to claim 6.

8. The positive electrode lead-out piece (141) is connected to the first connection sheet (141a) of the positive electrode, and further includes a second connection sheet (141b) of the positive electrode that extends inwardly within the battery casing (110). The positive electrode lead-out piece (141) is connected to the positive electrode tab of the electrode core (120) by the second connection sheet (141b) of the positive electrode. The negative electrode lead-out piece (142) is connected to the first connection sheet (142a) of the negative electrode, and further includes a second connection sheet (142b) of the negative electrode that extends inwardly within the battery casing (110). The negative electrode lead-out piece (142) is connected to the negative electrode tab of the electrode core (120) by the second connection sheet (142b) of the negative electrode. The battery (100) according to claim 1.

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

10. A vehicle comprising the battery pack according to claim 9.

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