Batteries, battery packs, and automotive.

Abstract

Invention details;

Description

Batteries, battery packs and vehicles

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on May 12, 2022, with application number 202210515990.7 and application name “Batteries, Battery Packs and Vehicles”, as well as priority to the Chinese patent application filed with the China Patent Office on November 10, 2022, with application number 202222993656.0 and application name “Batteries, Battery Packs and Vehicles”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery, a battery pack and a vehicle. Background Art

[0004] In batteries of the prior art, the lead-out tab is arranged in the battery casing and connected between the pole ear and the conductive column of the pole core, so as to enable the current to flow in and out of the battery. However, the lead-out tabs in the prior art have a single size. Either the cross-sectional area of ​​the lead-out tab is too large, resulting in waste of resources, or the cross-sectional area of ​​the lead-out tab is too small, resulting in heat problems, which in turn causes battery thermal safety problems.

[0005] Summary of the Invention

[0006] This application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of this application is to provide a battery with a strong flow capacity. During use, the battery will not heat up due to a small flow area, thereby exceeding the battery's operating temperature range and causing battery thermal safety issues.

[0007] The present application also proposes a battery pack having the above-mentioned battery.

[0008] The present application also proposes a vehicle having the above-mentioned battery pack.

[0009] The battery according to the present application comprises: a battery housing, a pole core, a lead-out plate, and a conductive column, wherein the pole core and the lead-out plate are both arranged in the battery housing, the lead-out plate is connected to the pole core, and the conductive column passes through the battery housing to connect the conductive column to the lead-out plate; wherein the cross-sectional area of ​​the lead-out plate is s 引 The relationship with the battery capacity C is: C / s 引 ≤15,s 引 The unit is mm 2 , the unit of C is Ah.

[0010] According to the battery of the present application, the cross-sectional area of ​​the lead-out sheet is s 引The relationship between the battery capacity C is: C / s 引 ≤8, which ensures the overcurrent capacity of the lead-out plate and ensures that the temperature of the lead-out plate will not be too high due to the small overcurrent area during battery use, thereby preventing problems such as affecting the internal temperature distribution of the battery, causing the internal temperature of the battery to exceed the battery operating temperature range, and causing battery thermal safety problems.

[0011] Optionally, the cross-sectional area s of the lead-out piece is 引 The relationship with the battery capacity C is: 2≤C / s 引 ≤15.

[0012] Optionally, the cross-sectional area s of the lead-out piece is 引 The relationship with the battery capacity C is: 2≤C / s 引 ≤15.

[0013] Optionally, the lead-out piece includes: a positive lead-out piece and a negative lead-out piece, the conductive column includes: a positive conductive column and a negative conductive column, the positive lead-out piece is provided through the battery case and is connected to the positive conductive column, the negative lead-out piece is provided through the battery case and is connected to the negative conductive column; the cross-sectional area of ​​the positive lead-out piece is s 正引 The relationship with the battery capacity C is: 5≤C / s 正引 ≤12, the cross-sectional area of ​​the negative electrode lead sheet s 负引 The relationship with the battery capacity C is: 6≤C / s 负引 ≤15, the cross section of the positive electrode lead sheet and the cross section of the negative electrode lead sheet are both perpendicular to the direction of current flow, s 正引 and s 负引 The unit is mm 2 , the unit of C is Ah.

[0014] Optionally, the cross-sectional area of ​​the positive electrode lead-out piece is 14 mm 2 -150mm 2 The cross-sectional area of ​​the negative electrode lead-out piece is 10 mm 2 -130mm 2 , the battery capacity C is 30Ah-400Ah.

[0015] Optionally, the positive electrode lead-out sheet is an aluminum sheet, and the negative electrode lead-out sheet is a copper sheet.

[0016] Optionally, the positive lead-out sheet and the negative lead-out sheet each include: a first connecting sheet and a second connecting sheet connected to each other, the second connecting sheet of the positive lead-out sheet is connected to the positive electrode ear of the electrode core, the first connecting sheet of the positive lead-out sheet is connected to the positive electrode conductive column, the second connecting sheet of the negative lead-out sheet is connected to the negative electrode ear of the electrode core, and the first connecting sheet of the negative lead-out sheet is connected to the negative electrode conductive column.

[0017] Optionally, a dimension of the first connecting piece in the length direction of the battery is 0.8 mm to 2 mm.

[0018] Optionally, the first connecting piece has a size of 0.6 mm to 2 mm in the length direction of the battery.

[0019] Optionally, the battery case includes: a first plate portion and a second plate portion facing each other in the length direction of the battery, and the first connecting piece of the positive lead-out piece and the first connecting piece of the negative lead-out piece are both parallel to the first plate portion and the second plate portion.

[0020] Optionally, the battery case also includes: a third plate portion and a fourth plate portion that are opposite to each other in the width direction of the battery and a fifth plate portion and a sixth plate portion that are opposite to each other in the thickness direction of the battery, and the second connecting piece of the positive lead-out piece and the second connecting piece of the negative lead-out piece are both parallel to the fifth plate portion and the sixth plate portion.

[0021] Optionally, the first plate portion, the second plate portion, the third plate portion, the fourth plate portion and the fifth plate portion are constructed as a lower shell with one side open, and the sixth plate portion is fixedly connected to the lower shell to block the open end of the lower shell.

[0022] Optionally, the battery further includes a first insulating spacer disposed in the battery casing, at least a portion of the first insulating spacer being located between the positive lead-out plate and the first plate portion, and the positive conductive column passing through the first insulating spacer to be connected to the positive lead-out plate.

[0023] Optionally, the battery further includes a second insulating spacer disposed in the battery casing, at least a portion of the second insulating spacer being located between the negative lead-out plate and the second plate portion, and the negative conductive column passing through the second insulating spacer to be connected to the negative lead-out plate.

[0024] Optionally, the relationship between the cross-sectional area s1 of the positive electrode conductive column and the battery capacity C is: 6 / 5≤C / s1≤16 / 3, and the relationship between the cross-sectional area s2 of the negative electrode conductive column and the battery capacity C is: 6 / 5≤C / s2≤8, where the units of s1 and s2 are both mm 2 .

[0025] Optionally, the cross-sectional area s1 of the positive electrode conductive column and the cross-sectional area s2 of the negative electrode conductive column are 12 mm 2 -315mm 2 , the battery capacity C is 30Ah~400Ah.

[0026] Optionally, the positive electrode conductive column is an aluminum column, and the negative electrode conductive column is a copper column.

[0027] The battery pack according to the present application includes the above-mentioned battery.

[0028] The vehicle according to the present application includes the above-mentioned battery or the above-mentioned battery pack.

[0029] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0031] FIG1 is a schematic diagram of a lower housing of a battery according to an embodiment of the present application;

[0032] FIG2 is a schematic diagram of a battery according to an embodiment of the present application;

[0033] FIG3 is a partial enlarged schematic diagram of circle C in FIG2 ;

[0034] FIG4 is a schematic diagram of a battery according to an embodiment of the present application;

[0035] FIG5 is a partial enlarged schematic diagram of circle D in FIG4;

[0036] 6 is a schematic diagram showing a cylindrical cross-section of a first positive (negative) conductive column or a second positive (negative) conductive column according to an embodiment of the present application;

[0037] 7 is a schematic diagram showing a racetrack-shaped cross-section of a first positive (negative) conductive column or a second positive (negative) conductive column according to an embodiment of the present application;

[0038] FIG8 is a cross-sectional view of a battery according to an embodiment of the present application;

[0039] FIG9 is a partial enlarged schematic diagram of circle E in FIG8 ;

[0040] FIG10 is a partial enlarged schematic diagram of circle H in FIG8;

[0041] FIG11 is a schematic diagram of a first insulating spacer according to an embodiment of the present application;

[0042] FIG12 is a schematic diagram of the cooperation between the second insulating ring and the negative electrode lead-out piece according to an embodiment of the present application;

[0043] FIG13 is a schematic diagram of a positive electrode lead-out sheet according to an embodiment of the present application;

[0044] FIG14 is a schematic diagram of a negative electrode lead-out sheet according to an embodiment of the present application;

[0045] FIG15 is an exploded view of a battery according to an embodiment of the present application;

[0046] FIG16 is a schematic diagram of a battery according to an embodiment of the present application in one direction;

[0047] FIG17 is a schematic diagram of a battery according to an embodiment of the present application in another direction;

[0048] FIG18 is a schematic diagram of a battery according to another embodiment of the present application;

[0049] FIG19 is a schematic diagram of the cooperation between the positive electrode conductive post, the sealing ring and the battery housing of a battery according to another embodiment of the present application;

[0050] FIG20 is a schematic diagram of the coordination of the negative electrode conductive post, the sealing ring, and the battery housing of a battery according to yet another embodiment of the present application;

[0051] FIG21 is a temperature rise curve diagram of the positive electrode conductive column and the negative electrode conductive column of the comparative example and Example 1;

[0052] FIG22 is a temperature rise curve diagram of the positive electrode conductive column and the negative electrode conductive column of the comparative example and Example 2;

[0053] FIG23 is a temperature rise curve diagram of the positive electrode conductive column and the negative electrode conductive column of the comparative example and Example 3;

[0054] FIG24 is a temperature rise curve diagram of the positive electrode conductive column and the negative electrode conductive column of the comparative example and Example 4;

[0055] FIG25 is a temperature rise curve diagram of the positive electrode conductive column and the negative electrode conductive column of the comparative example and Example 5;

[0056] FIG26 is a temperature rise curve diagram of the positive electrode conductive column and the negative electrode conductive column of the comparative example and Example 6;

[0057] FIG27 is a temperature rise curve diagram of the positive electrode conductive column and the negative electrode conductive column of the comparative example and Example 7;

[0058] FIG28 is a temperature rise curve diagram of the positive electrode conductive column and the negative electrode conductive column of the comparative example and Example 8;

[0059] FIG29 is a temperature rise curve diagram of the positive electrode lead-out tab and the negative electrode lead-out tab of the comparative example and Example 1;

[0060] FIG30 is a temperature rise curve diagram of the positive electrode lead-out tab and the negative electrode lead-out tab of the comparative example and Example 2;

[0061] FIG31 is a temperature rise curve diagram of the positive electrode lead-out tab and the negative electrode lead-out tab of the comparative example and Example 3;

[0062] FIG32 is a temperature rise curve diagram of the positive electrode lead-out tab and the negative electrode lead-out tab of the comparative example and Example 4;

[0063] FIG33 is a temperature rise curve diagram of the positive electrode lead-out tab and the negative electrode lead-out tab of the comparative example and Example 5;

[0064] FIG34 is a temperature rise curve diagram of the positive electrode lead-out tab and the negative electrode lead-out tab of the comparative example and Example 6;

[0065] FIG35 is a temperature rise curve diagram of the positive electrode lead-out tab and the negative electrode lead-out tab of the comparative example and Example 7;

[0066] FIG36 is a temperature rise curve diagram of the positive electrode lead-out tab and the negative electrode lead-out tab of the comparative example and Example 8;

[0067] FIG37 is a schematic diagram of a battery pack according to an embodiment of the present application;

[0068] FIG38 is a schematic diagram of a vehicle according to one embodiment of the present application;

[0069] FIG39 is a schematic diagram of a vehicle according to another embodiment of the present application.

[0070] Reference numerals: vehicle 10000, battery pack 1000, battery 100, battery housing 110, first plate 111, second plate 112, third plate 113, fourth plate 114, fifth plate 115, sixth plate 116, pole core 120, positive electrode conductive column 131, first positive electrode conductive column 131a, second positive electrode conductive column 131b, first connector 131c, first insulating plate 131d, positive electrode conductive column flange 131e, negative electrode conductive column 132, first negative electrode conductive column 132a, second negative electrode conductive column 132b, second connector 132c, second insulating plate 132d, negative electrode conductive column flange 131e Pole conductive column flange edge 132e, positive lead-out piece 141, positive first connecting piece 141a, positive second connecting piece 141b, negative lead-out piece 142, negative first connecting piece 142a, negative second connecting piece 142b, first sealing ring 151, second sealing ring 152, first insulating spacer 161, first supporting part 161a, first insulating part vertical plate 161b, first insulating part horizontal plate 161c, second insulating spacer 162, second supporting part 162a, second insulating part vertical plate 162b, second insulating part horizontal plate 162c, electrolyte infiltration through hole 101, via 102. DETAILED DESCRIPTION

[0071] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0072] The battery 100 according to an embodiment of the present application is described below with reference to Figures 1 to 36.

[0073] The battery according to the embodiment of the present application includes a battery housing 110 , a pole core 120 and a conductive column.

[0074] The pole core 120 is disposed inside the battery housing 110. The conductive post is passed through the battery housing 110 so that the inner end of the conductive post is connected to the pole core 120 and the outer end of the conductive post extends out of the battery housing 110. Specifically, the inner end of the conductive post is connected to the tab of the pole core 120. Meanwhile, the cross-sectional area of ​​the conductive post is s, the battery capacity is C, and the relationship between s and C is: C / s≤8, where s is in mm. 2 , the unit of C is Ah.

[0075] It is understood that the cross-sectional area of ​​the conductive column represents the current carrying capacity of the conductive column. The larger the cross-sectional area of ​​the conductive column, the stronger the current carrying capacity of the conductive column. At the same time, the minimum cross-sectional area on the conductive column determines the current carrying capacity of the conductive column. The cross-sectional area of ​​the conductive column is a surface perpendicular to the direction of current flow. If the conductive column is a cylinder and the current flows in the axial direction of the conductive column, the cross-sectional area of ​​the conductive column is a radial cross-sectional area and has a circular shape. When the conductive column adopts a variable cross-sectional design, the cross-sectional area of ​​the conductive column can be understood as the area of ​​the minimum cross-sectional area on the conductive column.

[0076] After a large number of experiments and demonstrations, the inventors of the present application found that satisfying the following relationship: C / s≤8 can ensure the overcurrent capacity of the conductive column of the battery 100 and ensure that the temperature of the battery 100 during use will not be high due to the small overcurrent area, thereby exceeding the operating temperature range of the battery 100 and causing thermal safety problems of the battery 100.

[0077] In some embodiments of the present application, the relationship between the cross-sectional area s of the conductive pillar and the battery capacity C is: 6 / 5 ≤ C / s ≤ 8. The inventors have discovered that the smaller the ratio of battery capacity C to the cross-sectional area s of the conductive pillar, the better. An excessively small ratio can result in an oversized conductive pillar, leading to a redundant design.

[0078] In some embodiments of the present application, the conductive column includes a positive conductive column 131 and a negative conductive column 132. The relationship between the cross-sectional area s1 of the positive conductive column 131 and the battery capacity C is: 6 / 5≤C / s1≤16 / 3, and the relationship between the cross-sectional area s2 of the negative conductive column 132 and the battery capacity C is: 6 / 5≤C / s2≤8, where the units of s1 and s2 are both mm 2 . It can be understood that when the positive conductive column 131 includes multiple positive electrode columns that pass through the battery shell 110 and are connected to the positive electrode ears of the pole core 120, the cross-sectional area s1 of the positive conductive column 131 is the sum of the cross-sectional areas of the multiple positive electrode columns. When the positive electrode column adopts a variable cross-sectional design, the cross-sectional area of ​​the positive electrode column can be understood as the area of ​​the minimum cross-sectional area on the positive electrode column. When the negative conductive column 132 includes multiple negative electrode columns that pass through the battery shell 110 and are connected to the negative electrode ears of the pole core 120, the cross-sectional area s2 of the negative conductive column 132 is the sum of the cross-sectional areas of the multiple negative electrode columns. When the negative electrode column adopts a variable cross-sectional design, the cross-sectional area of ​​the negative electrode column can be understood as the area of ​​the minimum cross-sectional area on the negative electrode column.

[0079] Furthermore, the relationship between the cross-sectional area s1 of the positive electrode conductive column 131 and the battery capacity C is: 8 / 3≤C / s1≤16 / 3, and the relationship between the cross-sectional area s2 of the negative electrode conductive column 132 and the battery capacity C is: 3≤C / s2≤8.

[0080] It should be noted that the positive conductive post 131 of the battery 100 can be made of aluminum, and the negative conductive post 132 can be made of copper. However, aluminum and copper have different conductivity properties. Given the same cross-sectional area, copper has a stronger current carrying capacity than aluminum. Therefore, to ensure that the positive conductive post 131 and the negative conductive post 132 have the same current carrying capacity, the cross-sectional area of ​​the negative conductive post 132, made of copper, can be smaller.

[0081] In some embodiments of the present application, the cross-sectional area s1 of the positive electrode conductive column and the cross-sectional area s2 of the negative electrode conductive column are 12 mm 2 -315mm 2 , battery capacity C is 30Ah~400Ah.

[0082] The following is an illustration of the comparative example (i.e., the prior art) and embodiments 1 to 8 (i.e., the embodiments of the present application) in Table 1. Under the same operating conditions, the batteries in the comparative example and embodiments 1 to 8 are fast charged at a rate of 2C, and the temperature rise curves of the positive conductive column 131 and the negative conductive column 132 are recorded. Among them, the cross-sectional area s1 of the positive conductive column 131, the cross-sectional area s2 of the negative conductive column 132 and the total capacity C of the battery of the comparative example and embodiments 1 to 8 are selected from the data in Table 1 below. Figure 21 is a temperature rise curve diagram of the positive conductive column 131 and the negative conductive column 132 of the comparative example and embodiment 1, Figure 22 is a temperature rise curve diagram of the positive conductive column 131 and the negative conductive column 132 of the comparative example and embodiment 2, Figure 23 is a temperature rise curve diagram of the positive conductive column 131 and the negative conductive column 132 of the comparative example and embodiment 3, and Figure 24 is a temperature rise curve diagram of the positive conductive column 131 and the negative conductive column 132 of the comparative example and embodiment 4. Figure 25 is a temperature rise curve diagram of the positive conductive column 131 and the negative conductive column 132 of the comparative example and Example 5, Figure 26 is a temperature rise curve diagram of the positive conductive column 131 and the negative conductive column 132 of the comparative example and Example 6, Figure 27 is a temperature rise curve diagram of the positive conductive column 131 and the negative conductive column 132 of the comparative example and Example 7, and Figure 28 is a temperature rise curve diagram of the positive conductive column 131 and the negative conductive column 132 of the comparative example and Example 8.

[0083] Table 1

[0084] 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, thereby ensuring that the battery is in a good working condition.

[0085] Further, as shown in Figures 3 and 5, the positive conductive column 131 includes a first positive conductive column 131a, a second positive conductive column 131b and a first connector 131c. The first positive conductive column 131a and the second positive conductive column 131b are both passed through the battery casing 110 to be connected to the positive electrode ear of the electrode core 120. The first connector 131c is provided outside the battery casing 110 and electrically connects the first positive conductive column 131a and the second positive conductive column 131b. The cross-sectional area s1 of the positive conductive column 131 is the sum of the cross-sectional area of ​​the first positive conductive column 131a and the cross-sectional area of ​​the second positive conductive column 131b.

[0086] The negative conductive column 132 includes: a first negative conductive column 132a, a second negative conductive column 132b and a second connecting member 132c. The first negative conductive column 132a and the second negative conductive column 132b are both passed through the battery casing 110 to be connected to the negative electrode ear of the electrode core 120. The second connecting member 132c is arranged outside the battery casing 110 and electrically connects the first negative conductive column 132a and the second negative conductive column 132b. The cross-sectional area s2 of the negative conductive column 132 is the sum of the cross-sectional area of ​​the first negative conductive column 132a and the cross-sectional area of ​​the second negative conductive column 132b.

[0087] The first connecting member 131c is connected between the outer end of the first positive conductive column 131a and the outer end of the second positive conductive column 131b, thereby increasing the contact area between the first positive conductive column 131a and the second positive conductive column 131b, and the positive conductive column 131 can be more easily connected to the outside world; the second connecting member 132c is connected between the outer end of the first negative conductive column 132a and the outer end of the second negative conductive column 132b, thereby increasing the contact area between the first negative conductive column 132a and the second negative conductive column 132b, and the negative conductive column 132 can be more easily connected to the outside world.

[0088] In some embodiments of the present application, the cross-sections of the first positive conductive column 131a and the second positive conductive column 131b are circular or waist-shaped, and the cross-sections of the first negative conductive column 132a and the second negative conductive column 132b are circular or waist-shaped. If the dimension of the battery casing 110 in the thickness direction is large, the first positive conductive column 131a, the second positive conductive column 131b, the first negative conductive column 132a and the second negative conductive column 132b with circular cross-sections can be used. However, if the dimension of the battery casing 110 in the thickness direction is small, the first positive conductive column 131a, the second positive conductive column 131b, the first negative conductive column 132a and the second negative conductive column 132b with waisted circular cross-sections can be used. This ensures that the first positive conductive column 131a, the second positive conductive column 131b, the first negative conductive column 132a and the second negative conductive column 132b will not exceed the dimension of the battery casing 110 in the thickness direction, provided that the positive conductive column 131 and the negative conductive column 132 have sufficient current-carrying capacity.

[0089] In some embodiments of the present application, as shown in Figures 1-4 and 15-20, the battery housing 110 includes: a first plate portion 111 and a second plate portion 112 that face each other in the length direction of the battery 100, a third plate portion 113 and a fourth plate portion 114 that face each other in the width direction of the battery 100, and a fifth plate portion 115 and a sixth plate portion 116 that face each other in the thickness direction of the battery 100. The length of the battery 100 is greater than the width of the battery 100, and the width of the battery 100 is greater than the thickness of the battery 100.

[0090] The first plate portion 111 and the second plate portion 112 are respectively connected to the third plate portion 113 and the fourth plate portion 114 at one end on the same side and the other end on the same side in the length direction of the battery 100. In other words, the first plate portion 111 is connected to the third plate portion 113 and the fourth plate portion 114 at one end on the same side in the length direction of the battery 100, and the second plate portion 112 is connected to the other end on the same side of the third plate portion 113 and the fourth plate portion 114 in the length direction of the battery 100; the fifth plate portion 115 and the sixth plate portion 116 are respectively connected to the third plate portion 113 and the fourth plate portion 114 at one end on the same side in the thickness direction of the battery 100; in other words, the fifth plate portion 115 is connected to the third plate portion 113 and the fourth plate portion 114 at one end on the same side in the thickness direction of the battery 100, and the sixth plate portion 116 is connected to the other end on the same side of the third plate portion 113 and the fourth plate portion 114 in the thickness direction of the battery 100.

[0091] A positive conductive column 131 is provided on the first plate portion 111, a negative conductive column 132 is provided on the second plate portion 112, a first insulating plate 131d is provided between the first plate portion 111 and the first connecting member 131c, and a second insulating plate 132d is provided between the second plate portion 112 and the second connecting member 132c, thereby effectively avoiding electrical connection between the first connecting member 131c and the battery housing 110, and electrical connection between the second connecting member 132c and the battery housing 110.

[0092] Furthermore, the first plate portion 111 is provided with a first through hole for the first positive conductive column 131a to pass through and a second through hole for the second positive conductive column 131b to pass through, and the second plate portion 112 is provided with a third through hole for the first negative conductive column 132a to pass through and a fourth through hole for the second negative conductive column 132b to pass through.

[0093] The interior of the battery shell 110 is also provided with a positive lead-out tab 141 and a negative lead-out tab 142. The positive lead-out tab 141 can be connected to the positive electrode ear of the electrode core 120, and the positive lead-out tab 141 is also connected to the positive electrode conductive column 131. The negative lead-out tab 142 can be connected to the negative electrode ear of the electrode core 120, and the negative lead-out tab 142 is also connected to the negative electrode conductive column 132.

[0094] As shown in Figures 9 and 10, a first sealing ring 151 is sleeved on the positive conductive post 131 and sandwiched between the positive lead tab 141 and the first plate portion 111. A second sealing ring 152 is sleeved on the negative conductive post 132 and sandwiched between the negative lead tab 142 and the second plate portion 112. Thus, the positive conductive post 131 is restrained by the first sealing ring 151 so that it does not contact the inner wall of the through-hole in the first plate portion 111 through which it passes. The negative conductive post 132 is restrained by the second sealing ring 152 so that it does not contact the inner wall of the through-hole in the second plate portion 112 through which it passes.

[0095] A first insulating spacer 161 is also provided between the positive lead-out tab 141 and the first plate portion 111. The positive conductive column 131 passes through the first insulating spacer 161 to be connected to the positive lead-out tab 141. The first insulating spacer 161 is an insulating part. The first insulating spacer 161 can prevent the positive lead-out tab 141 from contacting the battery case 110, thereby improving the safety performance of the battery 100.

[0096] A second insulating spacer 162 is also provided between the negative lead-out tab 142 and the second plate portion 112. The negative conductive column 132 passes through the second insulating spacer 162 to be connected to the negative lead-out tab 142. The second insulating spacer 162 is an insulating part. The second insulating spacer 162 can prevent the negative lead-out tab 142 from contacting the battery case 110, thereby improving the safety performance of the battery 100.

[0097] Furthermore, a first step portion is provided on the outer surface of the first insulating spacer 161, which cooperates with the inner end of the first sealing ring 151. The first step portion can limit the movement of the first sealing ring 151 and the positive conductive column 131, thereby preventing the positive conductive column 131 from directly contacting the battery housing 110; a second step portion is provided on the outer surface of the second insulating spacer 162, which cooperates with the inner end of the second sealing ring 152. The second step portion can limit the movement of the second sealing ring 152 and the negative conductive column 132, thereby preventing the negative conductive column 132 from directly contacting the battery housing 110.

[0098] It can be understood that a portion of the inner end of the positive conductive column 131 cooperates with the step portion on the first insulating spacer 161, and another portion of the positive conductive column 131 stops against the positive lead-out piece 141; a portion of the inner end of the negative conductive column 132 cooperates with the step portion on the second insulating spacer 162, and another portion of the negative conductive column 132 stops against the negative lead-out piece 142.

[0099] In some embodiments of the present application, the dimensions of the first insulating portion vertical plate 161b and the second insulating portion vertical plate 162b in the length direction of the battery shell are both 0.3mm-1.5mm. In order to ensure the insulation between the positive lead-out tab 141, the negative lead-out tab 142 and the battery shell 110, while occupying as little space in the length direction of the battery shell 110 as possible, when the thickness is less than 0.3mm, it is possible that the welding heat will melt the spacer when the tab is welded to the lead-out tab, resulting in insufficient insulation. When the thickness is greater than 1.5mm, too much space is occupied in the pole core 120, resulting in reduced space utilization and affecting the design capacity of the battery 100. Therefore, after multiple experiments and debugging by the inventors of the present application, the dimensions of the first insulating portion vertical plate 161b and the second insulating portion vertical plate 162b in the length direction of the battery shell 110 were both selected to be 0.3mm-1.5mm.

[0100] As shown in Figures 11-12, the first insulating spacer 161 includes: a first supporting portion 161a and a first insulating portion connected to the first supporting portion 161a, the inner end and outer end of the first supporting portion 161a are respectively stopped at the pole core 120 and the first plate portion 111 of the battery 100, and the first insulating portion cooperates with the positive lead-out tab 141 and is arranged between the positive lead-out tab 141 and the battery shell 110; the second insulating spacer 162 includes: a second supporting portion 162a and a second insulating portion connected to the second supporting portion 162a, the inner end and outer end of the second supporting portion 162a are respectively stopped at the end of the pole core 120 and the second plate portion 112, and the second insulating portion cooperates with the negative lead-out tab 142 and is arranged between the negative lead-out tab 142 and the battery shell 110.

[0101] The first insulating part includes: a first insulating part vertical plate 161b and a first insulating part horizontal plate 161c, the first insulating part vertical plate 161b is arranged between the positive first connecting piece 141a and the first plate part 111, and the first insulating part horizontal plate 161c is arranged between the positive second connecting piece 141b and a side plate of the battery shell 110 in the thickness direction; the second insulating part includes: a second insulating part vertical plate 162b and a second insulating part horizontal plate 162c, the second insulating part vertical plate 162b is arranged between the negative first connecting piece 142a and the second plate part 112, and the second insulating part horizontal plate 162c is arranged between the negative second connecting piece 142b and a side plate of the battery shell 110 in the thickness direction.

[0102] In some embodiments of the present application, the first plate portion 111, the second plate portion 112, the third plate portion 113, the fourth plate portion 114, and the fifth plate portion 115 are configured as a lower shell with one side open, and the sixth plate portion 116 is fixedly connected to the lower shell to block the open end of the lower shell. As a result, the pole core 120 does not need to pass through a narrow passage to enter the interior of the battery shell 110, but instead enters the interior of the battery shell 110 through a very wide open end, thereby greatly reducing installation costs and saving installation time.

[0103] Specifically, the first insulating horizontal plate 161 c is disposed between the positive second connecting piece 141 b and the fifth plate portion 115 , and the second insulating horizontal plate 162 c is disposed between the negative second connecting piece 142 b and the fifth plate portion 115 .

[0104] The first support portion 161a is larger than the first insulating vertical plate 161b in the length direction of the battery case 110, and the second support portion 162a is larger than the second insulating vertical plate 162b in the length direction of the battery case 110. Thus, the first support portion 161a and the second support portion 162a can firmly clamp the electrode core 120 inside the battery case 110, preventing the electrode core 120 from moving inside the battery case 110.

[0105] In some embodiments of the present application, the outer end surface of the positive electrode conductive column 131 extends out of the battery housing and is 2 mm to 5 mm away from the outer side surface of the first plate portion 111. The outer side surface of the negative electrode conductive column 132 extends out of the battery housing and is 2 mm to 5 mm away from the outer side surface of the second plate portion 112. This ensures that the positive electrode conductive column 131 and the negative electrode conductive column 132 have sufficient protrusions to connect to external electrical devices. At the same time, when the overall length of the battery 100 is determined, the positive electrode conductive column 131 and the negative electrode conductive column 132 will not occupy too much space in the length direction of the battery 100, thereby ensuring that the battery 100 has sufficient capacity.

[0106] According to the battery 100 of the embodiment of the present application, the pole core 120 and the lead-out tab are both arranged in the battery shell 110, and the lead-out tab is connected to the pole core 120. Specifically, the lead-out tab is connected to the pole ear of the pole core 120. The conductive column passes through the battery shell 110, and the inner end of the conductive column is connected to the lead-out tab, and the outer end of the conductive column extends out of the battery shell 110, so that the conductive column can realize charging and discharging of the pole core 120.

[0107] The cross-sectional area of ​​the lead sheet is s 引 The relationship with the battery capacity C is: C / s 引≤15. It should be noted that the cross-sectional area of ​​the lead-out tab determines the current carrying capacity of the lead-out tab. Therefore, the ratio of the battery capacity to the cross-sectional area of ​​the lead-out tab is used in this relationship to express the current carrying capacity of the lead-out tab. It should be noted that the cross-sectional area of ​​the lead-out tab is a surface perpendicular to the direction of current flow or a plane perpendicular to the thickness of the lead-out tab. When the lead-out tab adopts a variable cross-sectional design, the cross-sectional area of ​​the lead-out tab is the area of ​​the smallest cross-sectional area on the lead-out tab.

[0108] After a large number of experiments, the inventors of this application found that satisfying this relationship can ensure the current-carrying capacity of the lead-out plate, and ensure that the temperature of the lead-out plate will not become high due to the small current-carrying area during use of the battery 100, thereby not affecting the internal temperature distribution of the battery 100, causing the internal temperature of the battery 100 to exceed the operating temperature range of the battery 100, and causing thermal safety problems of the battery 100.

[0109] Furthermore, the cross-sectional area s of the lead sheet 引 The relationship with battery capacity C is: 2≤C / s 引 ≤15. Thus, it can be further ensured that the lead-out plate has sufficient current capacity. The inventors found that the battery capacity C is related to the cross-sectional area s of the lead-out plate. 引 The smaller the ratio, the better. A too small ratio will cause the lead-out piece to be too large, resulting in a redundant design and taking up too much space inside the battery.

[0110] In some embodiments of the present application, as shown in Figures 13-14, the lead-out tabs include: a positive lead-out tab 141 and a negative lead-out tab 142, and the conductive columns include: a positive conductive column 131 and a negative conductive column 132. The positive conductive column 131 passes through the battery case 110 and is connected to the positive lead-out tab 141, the negative conductive column 132 passes through the battery case 110 and is connected to the negative lead-out tab 142, the positive lead-out tab 141 is connected to the positive electrode ear of the electrode core 120, and the negative electrode lead-out tab 142 is connected to the negative electrode ear of the electrode core 120.

[0111] The cross-sectional area s of the positive electrode lead-out tab 141 正引 The relationship with battery capacity C is: 5≤C / s 正引 ≤12, cross-sectional area s of the negative electrode lead-out piece 142 负引 The relationship with battery capacity C is: 6≤C / s 负引 ≤15. The positive lead sheet 141 may be an aluminum sheet, and the negative lead sheet 142 may be a copper sheet. Since the flow capacity of the aluminum sheet is smaller than that of the copper sheet under the same cross-sectional area, the cross-sectional area of ​​the copper sheet can be reduced on the premise that the positive lead sheet 141 and the negative lead sheet 142 have the same flow capacity.

[0112] In some embodiments of the present application, the cross-sectional area of ​​the positive electrode lead-out piece 141 is 14 mm 2 -150mm 2 The cross-sectional area of ​​the negative electrode lead-out piece 142 is 10 mm 2 -130mm 2 , the battery capacity C is 30Ah-400Ah.

[0113] The following is an illustration of the comparative example (i.e., prior art) and Examples 1 to 8 (i.e., examples of the present application) in Table 2. Under the same operating conditions, the batteries in the comparative example and Examples 1 to 8 are fast charged at a rate of 2C, and the temperature rise curves of the positive electrode lead-out tab 141 and the negative electrode lead-out tab 142 are recorded. The cross-sectional area s of the positive electrode lead-out tab 141 in the comparative example and Examples 1 to 8 is 正引 , the cross-sectional area s of the negative electrode lead-out piece 142 负引 and the total capacity C of the battery are selected from the data in Table 2 below. FIG29 is a temperature rise curve diagram of the positive electrode lead-out sheet 141 and the negative electrode lead-out sheet 142 of the comparative example and Example 1, FIG30 is a temperature rise curve diagram of the positive electrode lead-out sheet 141 and the negative electrode lead-out sheet 142 of the comparative example and Example 2, FIG31 is a temperature rise curve diagram of the positive electrode lead-out sheet 141 and the negative electrode lead-out sheet 142 of the comparative example and Example 3, and FIG32 is a temperature rise curve diagram of the positive electrode lead-out sheet 141 and the negative electrode lead-out sheet 142 of the comparative example and Example 4. Figure 33 is a temperature rise curve diagram of the positive lead-out sheet 141 and the negative lead-out sheet 142 of the comparative example and Example 5, Figure 34 is a temperature rise curve diagram of the positive lead-out sheet 141 and the negative lead-out sheet 142 of the comparative example and Example 6, Figure 35 is a temperature rise curve diagram of the positive lead-out sheet 141 and the negative lead-out sheet 142 of the comparative example and Example 7, and Figure 36 is a temperature rise curve diagram of the positive lead-out sheet 141 and the negative lead-out sheet 142 of the comparative example and Example 8.

[0114] Table 2

[0115] Compared with the comparative example, the temperature rise of the positive electrode lead-out tab 141 and the negative electrode lead-out tab 142 in Examples 1 to 8 is relatively low, thereby ensuring that the battery is in a good working condition.

[0116] Furthermore, as shown in Figures 13-14, the positive lead-out piece 141 and the negative lead-out piece 142 have the same structure and both include: a first connecting piece and a second connecting piece connected to each other, the second connecting piece of the positive lead-out piece 141 is opposite to the fifth plate portion 115 and is fixedly connected to the positive pole ear of the pole core 120, the first connecting piece of the positive lead-out piece 141 is opposite to the first plate portion 111 and is connected to the positive conductive column 131, the second connecting piece of the negative lead-out piece 142 is opposite to the fifth plate portion 115 and is fixedly connected to the negative pole ear of the pole core 120, and the first connecting piece of the negative lead-out piece 142 is opposite to the second plate portion 112 and is connected to the negative conductive column 132. For ease of description, the first connecting piece of the positive lead-out piece 141 can be marked as the positive first connecting piece 141a, and the second connecting piece of the positive lead-out piece 141 can be marked as the positive second connecting piece 141b; similarly, the first connecting piece of the negative lead-out piece 142 can be marked as the negative first connecting piece 142a, and the second connecting piece of the negative lead-out piece 142 can be marked as the negative second connecting piece 142b.

[0117] In some embodiments of the present application, the dimensions of the positive first connecting tab 141 a and the negative first connecting tab 142 a in the length direction of the battery housing are both 0.8 mm to 0.2 mm.

[0118] The battery case 110 includes a first plate portion 111 and a second plate portion 112 that are opposite to each other in the length direction, the first connecting piece of the positive lead-out piece 141 (that is, the positive first connecting piece 141a) is parallel to the first plate portion 111, and the first connecting piece of the negative lead-out piece 142 (that is, the negative first connecting piece 142a) is parallel to the second plate portion 112.

[0119] A first insulating spacer 161 is provided between the positive lead-out tab 141 and the first plate portion 111, and the positive conductive column 131 passes through the first insulating spacer 161 and is connected to the positive lead-out tab 141; a second insulating spacer 162 is provided between the negative lead-out tab 142 and the second plate portion 112, and the negative conductive column 132 passes through the second insulating spacer 162 and is connected to the negative lead-out tab 142; thereby, direct contact between the positive lead-out tab 141 and the negative lead-out tab 142 and the battery case 110 can be avoided, thereby improving the overall safety performance of the battery 100.

[0120] At least a portion of the first insulating spacer 161 is disposed between the second connecting tab of the positive lead tab 141 and the fifth plate portion 115, and at least a portion of the second insulating spacer 162 is disposed between the second connecting tab of the negative lead tab 142 and the fifth plate portion 115. In other words, the first insulating spacer 161 not only separates the positive lead tab 141 from the first plate portion 111, but also separates it from the fifth plate portion 115. The second insulating spacer 162 not only separates the negative lead tab 142 from the second plate portion 112, but also separates it from the fifth plate portion 115.

[0121] As shown in Figure 1-14, the first insulating spacer 161 includes: a first supporting portion 161a and a first insulating portion connected to the first supporting portion 161a, the inner end and the outer end of the first supporting portion 161a are respectively stopped at one end of the pole core 120 of the battery 100 and the first plate portion 111, the first insulating portion cooperates with the positive lead-out tab 141 and is arranged between the positive lead-out tab 141 and the battery shell 110; the second insulating spacer 162 includes: a second supporting portion 162a and a second insulating portion connected to the second supporting portion 162a, the inner end and the outer end of the second supporting portion 162a are respectively stopped at one end of the pole core 120 of the battery 100 and the second plate portion 112, the second insulating portion cooperates with the negative lead-out tab 142 and is arranged between the negative lead-out tab 142 and the battery shell 110.

[0122] The first insulating part includes: a first insulating part vertical plate 161b and a first insulating part horizontal plate 161c, the first insulating part vertical plate 161b is arranged between the positive first connecting piece 141a and the first plate part 111, and the first insulating part horizontal plate 161c is arranged between the positive second connecting piece 141b and the fifth plate part 115; the second insulating part includes: a second insulating part vertical plate 162b and a second insulating part horizontal plate 162c, the second insulating part vertical plate 162b is arranged between the negative first connecting piece 142a and the second plate part 112, and the second insulating part horizontal plate 162c is arranged between the negative second connecting piece 142b and the fifth plate part 115.

[0123] The thickness of the first support portion 161a in the length direction of the battery casing 110 is greater than the thickness of the first insulating vertical plate 161b in the length direction of the battery casing 110. Therefore, the first support portion 161a can abut against the end of the pole core 120. The thickness of the second support portion 162a in the length direction of the battery casing 110 is greater than the thickness of the second insulating vertical plate 162b in the length direction of the battery casing 110. Therefore, the second support portion 162a can abut against the other end of the pole core 120. Therefore, the first support portion 161a and the second support portion 162a can together abut the pole core 120 in the length direction of the battery casing 110, preventing the pole core 120 from moving in the length direction of the battery casing 110.

[0124] Specifically, the first insulating part vertical plate 161b is arranged between the positive first connecting piece 141a and the first plate portion 111, the first insulating part horizontal plate 161c is arranged between the positive second connecting piece 141b and the fifth plate portion 115, the second insulating part vertical plate 162b is arranged between the negative first connecting piece 142a and the second plate portion 112, and the second insulating part horizontal plate 162c is arranged between the negative second connecting piece 142b and the fifth plate portion 115.

[0125] The positive lead-out tab 141 and the first insulating portion can both be constructed as an "L"-shaped structure, and the positive lead-out tab 141 can be arranged on the inner side of the first insulating portion and fit together. The negative lead-out tab 142 and the second insulating portion can also both be constructed as an "L"-shaped structure, and the negative lead-out tab 142 can be arranged on the inner side of the second insulating spacer portion and fit together.

[0126] In some embodiments of the present application, the first insulating portion vertical plate 161b and the first positive electrode connecting tab 141a are both 0.3 mm to 1.5 mm in the length direction of the battery housing 110. That is, the first insulating portion vertical plate 161b and the first positive electrode connecting tab 141a are both 0.3 mm to 1.5 mm in thickness.

[0127] In this way, the insulation between the positive lead-out tab 141, the negative lead-out tab 142 and the battery shell 110 can be ensured, while the space in the length direction inside the battery shell 110 is occupied as little as possible. When the thickness is less than 0.3 mm, the welding heat may melt the spacer when the tab and the lead-out tab are welded, resulting in insufficient insulation. When the thickness is greater than 1.5 mm, too much space in the pole core 120 is occupied, resulting in reduced space utilization and affecting the design capacity of the battery 100.

[0128] The battery 100 of the embodiment of the present application also includes a sealing ring, which is sealed between the conductive column and the battery housing 110. The sealing ring is constructed as an elastic member and is an insulating member, so that the lead-out plate can be effectively insulated from the battery housing 110. The initial size of the sealing ring in its axial direction is d1, and the compressed size of the sealing ring in its axial direction is d2. The d1 and d2 satisfy: 0.5≤d2 / d1≤0.9, and the units of d1 and d2 are both mm.

[0129] In some embodiments, the sealing ring is sleeved on the conductive post and clamped between the inner wall of the battery housing 110 and the lead-out tab. It should be noted that the initial axial dimension d1 of the sealing ring can be understood as the axial dimension of the sealing ring after it is released from compression and is elastically reset (d1 is also the distance between the two axially opposite end faces of the sealing ring after it is reset). When the sealing ring is clamped between the inner wall of the battery housing and the lead-out tab, d2 can be understood as the distance between the two axially opposite surfaces of the sealing ring, one of which is the surface of the sealing ring in contact with the inner wall of the battery housing, and the other is the surface of the sealing ring in contact with the lead-out tab.

[0130] The initial axial size of the sealing ring is the axial size of the sealing ring before it is squeezed. After the sealing ring is squeezed, the axial size of the sealing ring will decrease. By limiting the ratio of the compressed size of the sealing ring to the initial size, it can be ensured that the sealing ring can have a certain amount of compression, which is convenient for installing the lead-out plate and the conductive column with a spacer, and at the same time, it can also ensure the sealing performance between the lead-out plate and the battery housing 110, and the sealing performance between the conductive column and the sealing ring, and when the battery size is the same, the battery capacity is improved.

[0131] Since the axial size of the sealing ring is reduced after being compressed, its radial size is naturally increased. The two axial side surfaces of the sealing ring are both constructed in a ring shape. The axial outer end of the sealing ring contacts the inner wall surface of the battery housing 110, and the axial inner end of the sealing ring contacts the lead-out piece, so that the axial ends of the sealing ring are clamped between the battery housing 110 and the lead-out piece.

[0132] At least one of the width of the contact area between the sealing ring and the inner wall surface of the battery shell 110, and the width of the contact area between the sealing ring and the lead-out piece is W, and the W satisfies: 1.2mm≤W≤2.5mm. This ensures the sealing between the sealing ring and the inner wall surface of the battery shell 110, and the sealing between the sealing ring and the lead-out piece. Among them, the width of the contact between the sealing ring and the inner wall surface of the battery shell 110 can be understood as the radial distance between the two outer contours of the contact area between the sealing ring and the inner wall surface of the battery shell 110. The width of the contact area between the sealing ring and the lead-out piece can be understood as the radial distance between the two outer contours of the contact area between the sealing ring and the lead-out piece.

[0133] In other embodiments of the present application, as shown in Figures 19 and 20, a sealing ring is sleeved onto a conductive post, and a flange is further provided on the outer circumference of the conductive post. The flange is connected to the lead-out tab, and at least a portion of the sealing ring is sandwiched between the flange and the inner wall of the battery casing. It should be noted that when the sealing ring is sandwiched between the inner wall of the battery casing and the flange, d2 can be understood as the distance between two axially opposing surfaces of the sealing ring, one of which 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.

[0134] That is, the inner end of the sealing ring no longer rests on the lead-out tab, but instead rests on the flange edge of the conductive post itself. Specifically, the sealing ring includes: a first sealing ring 151 and a second sealing ring 152. The first sealing ring 151 is sleeved onto the positive conductive post, with a portion of the first sealing ring 151 extending into the through-hole 102 of the first plate portion 111, and the other portion of the first sealing ring 151 sandwiched between the positive conductive post flange edge 131e of the positive conductive post and the first plate portion 111. The second sealing ring 152 is sleeved onto the negative conductive post, with a portion of the second sealing ring 152 extending into the through-hole 102 of the second plate portion 112, and the other portion of the second sealing ring 152 sandwiched between the negative conductive post flange edge 132e of the negative conductive post and the second plate portion 112.

[0135] In some embodiments of the present application, a spacer is provided between the lead tab and the battery housing 110. Both the conductive post and the sealing ring are passed through the spacer. The inner end of the conductive post is connected to the lead tab, and the inner end of the sealing ring abuts against the lead tab. The sealing ring is sleeved around the outer circumference of the conductive post and can be inserted together with the conductive post into a via hole in the battery housing 110 through which the conductive post passes. Alternatively, the sealing ring can be positioned outside the via hole, ensuring that the conductive post does not move radially in the via hole and thus avoids contact with the inner circumferential wall of the via hole.

[0136] Specifically, a portion of the inner end of the sealing ring can cooperate with the step portion on the spacer, thereby limiting the radial movement of the sealing ring and the conductive column in the via hole, while another portion of the inner end of the sealing ring can stop on the lead-out plate.

[0137] In some embodiments of the present application, the spacer includes: a supporting portion and an insulating portion connected to the supporting portion, the inner end and the outer end of the supporting portion respectively abut against the pole core 120 of the battery 100 and the battery shell 110, and the insulating portion cooperates with the lead-out piece and is arranged between the lead-out piece and the battery shell 110.

[0138] The structures of the insulating part and the lead-out plate can be roughly the same, for example, both can be constructed in an "L" shape, the insulating part includes: a vertical insulating plate and a horizontal insulating plate vertically connected, the lead-out plate includes: a first connecting plate and a second connecting plate vertically connected, the vertical insulating plate can be arranged between the first connecting plate and a side plate of the shell, and the horizontal insulating plate can be arranged between the second connecting plate and a side plate of the shell.

[0139] In some embodiments of the present application, the battery housing 110 is constructed of an aluminum alloy, and the thickness of the lower housing and the sixth plate portion 116 is 0.2 mm to 0.5 mm. Due to the low hardness of aluminum alloys, the thickness of the lower housing and the sixth plate portion 116 need to be set thicker to ensure the structural strength of the battery housing 110.

[0140] In other embodiments of the present application, the battery housing 110 is constructed of stainless steel or nickel-plated steel, and the thickness of the lower housing and the thickness of the sixth plate portion 116 are 0.05 mm to 0.2 mm. Due to the high hardness of stainless steel or nickel-plated steel, the thickness of the lower housing and the thickness of the sixth plate portion 116 can be set relatively thin, thereby reducing the manufacturing cost of the battery housing 110 while ensuring the structural strength of the battery housing 110.

[0141] It should be noted that the plate thickness of the lower case is the plate thickness of any one of the first plate portion 111 , the second plate portion 112 , the third plate portion 113 , the fourth plate portion 114 , and the fifth plate portion 115 .

[0142] As shown in Figures 16-18, the positive lead-out tab 141 and the negative lead-out tab 142 are disposed within the battery housing 110 and are connected to the positive and negative tabs, respectively, of the electrode core 120. The positive lead-out tab 141 includes a positive first connecting tab 141a, and the negative lead-out tab 142 includes a negative first connecting tab 142a. The positive first connecting tab 141a and the negative first connecting tab 142a are located at opposite ends of the electrode core 120 along the length of the battery housing 110. The distance between the positive first connecting tab 141a and the negative first connecting tab 142a in the length direction of the battery housing 110 is L1. The dimension of the battery 100 in the length direction of the battery housing 110 is L, and L1 and L satisfy the following: 0.95≤L1 / L≤0.99. It is understood that the positive first connecting tab 141a has a first surface facing the negative first connecting tab 142a, and the negative first connecting tab 142a has a second surface facing the positive first connecting tab 141a. The distance between the first surface of the positive first connecting tab 141a and the second surface of the negative first connecting tab 142a in the length direction of the battery casing 110 is L1. The battery casing 110 has a first surface and a second surface that are opposite to each other along its length direction. 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 is consistent with the length direction of the battery 100.

[0143] In some embodiments, since the positive lead-out piece 141 includes: a connected positive second connecting piece 141b and a positive first connecting piece 141a, and the negative lead-out piece 142 includes: a connected negative second connecting piece 142b and a negative first connecting piece 142a, "L1" in this application is the distance between the inner side surface of the positive first connecting piece 141a and the inner side surface of the negative first connecting piece 142a in the length direction of the battery case 110.

[0144] L1 and L satisfy: 0.95≤L1 / L≤0.99, which can ensure that the positive lead-out tab 141 and the negative lead-out tab 142 have sufficient conductivity, while at the same time the positive lead-out tab 141 and the negative lead-out tab 142 will not occupy too much internal space of the battery shell 110, especially will not occupy a large amount of space in the length direction of the battery shell 110.

[0145] In some embodiments of the present application, the thickness of the positive first connecting tab 141a is 0.6 mm to 2 mm, and the thickness of the negative first connecting tab 142a is 0.6 mm to 2 mm. The thickness of the positive first connecting tab 141a refers to the dimension of the positive first connecting tab 141a along the length of the battery casing, while the thickness of the negative first connecting tab 142a refers to the dimension of the negative first connecting tab 142a along the length of the battery casing.

[0146] The positive lead tab 141 is constructed in an L-shape and can be an integrally molded part. The negative lead tab 142 is also constructed in an L-shape and can be an integrally molded part. The thickness of the positive lead tab 141 can be the thickness of the positive first connecting tab 141a, and the thickness of the negative lead tab 142 can be the thickness of the negative first connecting tab 142a. This is because the thickness of the positive first connecting tab 141a and the thickness of the negative first connecting tab 142a affect the extent to which the positive lead tab 141 and the negative lead tab 142 occupy the longitudinal space within the battery case 110. Therefore, the thickness of the positive lead tab 141 is limited to 0.6 mm to 2 mm, and the thickness of the negative lead tab 142 is limited to 0.6 mm to 2 mm. This ensures that the positive lead tab 141 and the negative lead tab 142 do not occupy too much space within the battery case 110, especially a large amount of space in the longitudinal direction of the battery case 110, thereby increasing the battery capacity while maintaining the same battery size. The positive conductive column 131 is disposed on the first plate portion 111 , and the negative conductive column 132 is disposed on the second plate portion 112 . However, the positive conductive column 131 does not directly contact the first plate portion 111 , and the negative conductive column 132 does not directly contact the second plate portion 112 .

[0147] The positive first connecting piece 141a is parallel to the first plate portion 111 and connected to the positive conductive column 131, the negative first connecting piece 142a is parallel to the second plate portion 112 and connected to the negative conductive column 132, and the distance between the inner side surface of the positive first connecting piece 141a and the inner side surface of the negative lead-out plate in the length direction of the battery case 110 is "L1".

[0148] In some embodiments, the pole core 120 has a first end face and a second end face relative to each other, the positive pole ear of the pole core 120 is led out from the first end face, and the negative pole ear of the pole core 120 is led out from the second end face, and the spacing between the first end face of the pole core 120 and the positive first connecting piece 141a in the length direction of the battery shell 110 is 2-12 mm, and the spacing between the second end face of the pole core 120 and the negative first connecting piece 142a in the length direction of the battery shell 110 is 2-12 mm.

[0149] The battery case 110 also includes a third plate portion 113 and a fourth plate portion 114 that face each other in the width direction. The spacing between the inner side surfaces of the third plate portion 113 and the inner side surfaces of the fourth plate portion 114 in the width direction of the battery case 110 is H1. The dimension of the battery 100 in the width direction of the battery case 110 is H. H1 and H satisfy the following: 0.92≤H1 / H≤0.98. This ensures that the thickness of the third plate portion 113 and the fourth plate portion 114 ensures that the battery case 110 has sufficient strength, while also preventing the third plate portion 113 and the fourth plate portion 114 from being too thick, thereby reducing the space inside the battery case 110 and affecting the capacity of the battery 100. It should be noted that the width direction of the battery case 110 is consistent with the width direction of the battery 100.

[0150] In some embodiments of the present application, the battery housing 110 further includes a fifth plate portion 115 and a sixth plate portion 116 that face each other in the thickness direction. The spacing between the inner side surfaces of the fifth plate portion 115 and the inner side surfaces of the sixth plate portion 116 in the width direction of the battery housing 110 is D1. The dimension of the battery 100 in the thickness direction of the battery housing 110 is D, where L>H>D, and D1 and D satisfy the following: 0.93≤D1 / D≤0.99. This prevents the thickness of the fifth plate portion 115 and the sixth plate portion 116 from being excessively large, preventing them from excessively occupying the internal space of the battery housing 110 given a given volume. Furthermore, the thickness of the fifth plate portion 115 and the sixth plate portion 116 also ensures that the battery housing 110 has sufficient structural strength. It should be noted that the thickness direction of the battery housing 110 is consistent with the thickness direction of the battery 100.

[0151] The positive second connecting tab 141b is disposed on the positive first connecting tab 141a and extends toward the interior of the battery housing 110. The negative second connecting tab 142b is connected to the negative first connecting tab 142a and extends toward the interior of the battery housing 110. Both the positive second connecting tab 141b and the negative second connecting tab 142b are parallel to the fifth plate portion 115 and the sixth plate portion 116. Specifically, both the positive second connecting tab 141b and the negative second connecting tab 142b are in contact with the inner side of the fifth plate portion 115.

[0152] The battery of the embodiment of the present application includes a lower shell and an upper shell. The upper shell and the lower shell can be connected together by welding. After the lower shell and the upper shell are fixed together, the upper shell and the lower shell define an accommodating space for accommodating the pole core 120.

[0153] According to some embodiments of the present application, the lower shell includes: a first plate portion 111 and a second plate portion 112, the first plate portion 111 and the second plate portion 112 are opposite to each other in the length direction of the battery 100; a third plate portion 113 and a fourth plate portion 114, the third plate portion 113 and the fourth plate portion 114 are opposite to each other in the width direction of the battery 100, the third plate portion 113 is respectively connected to the first plate portion 111 and the second plate portion 112 on the same side of the width direction of the battery 100, and the fourth plate portion 113 is connected to the first plate portion 111 and the second plate portion 112 on the same side of the width direction of the battery 100. The plate portion 114 is connected to the other ends of the first and second plate portions 111, 112, on the same side of the width direction of the battery 100. The fifth plate portion 115 is connected to the outer periphery of the first, second, third, and fourth plate portions 113, 114, on the same side of the thickness direction of the battery 100. The first, second, third, and fourth plate portions 111, 112, 113, and 114 form the peripheral side walls of the lower housing. As a result, the lower housing has a very large opening, making it easy to install the pole core 120 inside the battery housing 110, improving the installation efficiency of the battery 100.

[0154] Furthermore, the first plate portion 111, the second plate portion 112, the third plate portion 113, the fourth plate portion 114, and the fifth plate portion 115 are integrally formed. The lower housing can be integrally formed by stamping the sheet metal. This greatly increases the molding efficiency of the lower housing and enhances its structural strength. The upper housing is constructed as a sixth plate portion 116, which faces the fifth plate portion 115 in the thickness direction of the battery 100.

[0155] The battery according to the present application includes a battery case 110 , an electrode core 120 , a lead sheet, and a spacer.

[0156] As shown in Figure 1-15, a accommodating space is provided in the battery shell 110, the pole core 120 and the lead-out plate are provided in the battery shell 110, the lead-out plate is connected to the pole ear of the pole core 120, a part of the spacer is clamped between the lead-out plate and the battery shell 110, and the other part of the spacer is clamped between the end of the pole core 120 and the battery shell 110.

[0157] In other words, the spacer of the present application not only separates the lead tab from the battery case 110, preventing short circuits caused by contact between the lead tab and the battery case 110, but also abuts against both ends of the electrode core 120, preventing the electrode core 120 from moving in one direction within the battery case 110, thereby improving the stability of the battery cell. This ensures that the tabs provided on the electrode core 120 will not move, and also improves the stability of the connection between the tabs and the lead tabs.

[0158] In some embodiments of the present application, the spacer includes a support portion and an insulating portion connected to the support portion. The support portion is sandwiched between the end of the pole core 120 and the battery housing 110. The insulating portion cooperates with the lead tab and is sandwiched between the lead tab and the battery housing 110. In fact, not only is the insulating portion itself an insulating portion, but the support portion is also an insulating member. The support portion and the insulating portion can be an integrally formed part.

[0159] The two ends of the support part can respectively stop at the end of the pole core 120 and the inner wall of the battery shell 110, and the insulating part can cooperate with the lead-out piece. At the same time, the insulating part is also spaced between the lead-out piece and the battery shell 110 to avoid direct contact between the lead-out piece and the battery shell 110, which may cause leakage.

[0160] Furthermore, the lead-out piece can be constructed in an "L" shape and include a first connecting piece and a second connecting piece, the first connecting piece and the second connecting piece are connected to each other, the first connecting piece is parallel to the side plate of the battery shell 110 in the length direction, and the second connecting piece is parallel to the side plate of the battery shell 110 in the thickness direction.

[0161] The insulating part is also constructed in an "L" shape and includes an insulating part vertical plate and an insulating part horizontal plate. The insulating part vertical plate is connected to the insulating part horizontal plate. The insulating part vertical plate is arranged between the first connecting plate and the side plate of the battery shell 110 in the length direction. The insulating part horizontal plate is arranged between the second connecting plate and a side plate of the battery shell 110 in the thickness direction.

[0162] The dimension of the support portion in the length direction of the battery shell 110 is larger than the dimension of the vertical plate of the insulating portion in the length direction of the battery shell 110. The support portion protrudes toward the center of the battery shell 110 compared to the vertical plate of the insulating portion, so that the support portion can stop on the end of the pole core 120, and the end of the pole core 120 will not stop on the vertical plate of the insulating portion.

[0163] It is understandable that the L-shaped lead-out piece can be arranged on the inner side of the L-shaped insulating portion, so that the insulating portion can completely wrap the lead-out piece to prevent it from directly contacting the battery housing 110 .

[0164] Furthermore, the outer side of the support portion is flush with the outer side of the vertical insulating plate, and the inner side of the support portion is flush with the inner end of the horizontal insulating plate. In other words, the inward projection of the support portion relative to the vertical insulating plate is the length of the horizontal insulating plate. When the second connecting piece on the horizontal insulating plate is superimposed and connected to the tab of the pole core 120, the support portion abuts against the end of the pole core 120 in the length direction.

[0165] In some embodiments of the present application, an electrolyte infiltration through-hole 101 and a through-hole for a conductive column to pass through are provided on the vertical plate of the insulating portion. The conductive column passes through the through-hole on the insulating portion and is connected to the first connecting piece. The electrolyte infiltration through-hole 101 provided on the insulating portion can facilitate the injection of electrolyte into the interior of the battery housing 110. At the same time, the gas inside the battery housing 110 can also be discharged outward through the electrolyte infiltration through-hole 101. It can be understood that the electrolyte infiltration through-hole 101 and the battery 100 explosion-proof valve and the injection hole on the battery housing 110 are directly opposite in the longitudinal direction of the battery housing 110.

[0166] In some embodiments of the present application, the battery housing 110 includes: a first plate portion 111 and a second plate portion 112 that are opposite to each other in the length direction of the battery housing 110, a third plate portion 113 and a fourth plate portion 114 that are opposite to each other in the width direction of the battery housing 110, and a fifth plate portion 115 and a sixth plate portion 116 that are opposite to each other in the thickness direction of the battery housing 110; the first plate portion 111, the second plate portion 112, the third plate portion 113, the fourth plate portion 114 and the fifth plate portion 115 are constructed as a lower shell with one end open, and the sixth plate portion 116 is fixed to the lower shell to close the open end.

[0167] The lead-out tabs include a positive lead-out tab 141 and a negative lead-out tab 142 . The positive lead-out tab 141 is connected to the positive conductive column 131 and the positive tab of the electrode core 120 , respectively. The negative lead-out tab 142 is connected to the negative conductive column 132 and the negative tab of the electrode core 120 , respectively.

[0168] The spacer includes: a first insulating spacer 161 and a second insulating spacer 162. The vertical plate of the first insulating spacer 161 is arranged between the first plate portion 111 and the first connecting plate of the positive lead-out plate 141, the horizontal plate of the first insulating spacer 161 is arranged between the fifth plate portion 115 and the second connecting plate of the positive lead-out plate 141, the vertical plate of the second insulating spacer 162 is arranged between the second plate portion 112 and the first connecting plate of the negative lead-out plate 142, and the horizontal plate of the second insulating spacer 162 is arranged between the fifth plate portion 115 and the second connecting plate of the negative lead-out plate 142.

[0169] The pole core 120 is directly placed in the lower shell, and then the tabs are welded to the lead-out tabs. The welding method can be laser welding, resistance welding or other welding methods. The lead-out tab is designed to be L-shaped to facilitate welding the tabs thereto. After the pole core 120 is assembled into the shell as a whole, the tabs can be naturally straightened and overlapped with the lead-out tabs, and then the two are welded together, thereby avoiding the risk of positive and negative contact caused by bending of the tabs. At the same time, the tab size can be shortened, the utilization rate of the metal current collector can be increased, the process yield can be improved, and the product cost can be reduced.

[0170] After the tabs of the pole core 120 are welded to the lead-out tabs of the lower shell, the upper shell (sixth plate portion 116) is assembled. After the upper shell and the lower shell are assembled, they are sealed at the edges by laser welding or crimping to form a sealed body.

[0171] After the battery housing 110 is assembled, liquid can be injected through the injection hole. After the injection is completed, the injection hole needs to be sealed. The sealing method is to weld metal sheets or seal with rubber nails. The explosion-proof valve of the battery 100 is set on the first plate portion 111 or the second plate portion 112. One or more explosion-proof valves can be set on the first plate portion 111 or the second plate portion 112.

[0172] The explosion-proof valve is formed by laser scoring or directly stamping the side panel of the battery housing 110. Alternatively, a hole of the same shape and size as the explosion-proof valve can be stamped on the battery housing 110, and then the explosion-proof valve can be welded to the battery housing 110.

[0173] According to some embodiments of the present application, the lead-out piece is constructed in an "L" shape, the second connecting piece is connected to one side of the first connecting piece and extends toward the inside of the shell, and the second connecting piece extending toward the inside of the shell can be welded and fixed to multiple pole ears, so that the multiple pole ears will not bend too much, and the pole ears will be flatter during and after welding.

[0174] In other embodiments of the present application, the lead-out tab is constructed in a "T" shape, and the second connecting tab is connected to the middle area of ​​the first connecting tab and extends toward the inside of the battery housing 110. Since the "T"-shaped lead-out tab still has a second connecting tab extending toward the inside of the housing, the tab can still be welded and fixed flatly to the second connecting tab, and the tab will not bend too much, which greatly improves the connection stability between the tab and the lead-out tab. A portion of the multiple tabs can be welded to one side of the second connecting tab in the thickness direction, and another portion of the multiple tabs can be welded and fixed to the other side of the second connecting tab in the thickness direction.

[0175] The first connecting piece may be parallel to the first plate portion 111 and the second plate portion 112 , and the conductive column may pass through the first plate portion 111 or the second plate portion 112 and be connected to the first connecting piece.

[0176] The conductive posts include a positive conductive post 131 and a negative conductive post 132. The lead tabs include a positive lead tab 141 and a negative lead tab 142. The positive conductive post 131 passes through the first plate portion 111 to connect to the first connecting tab of the positive lead tab 141. The negative conductive post 132 passes through the second plate portion 112 to connect to the first connecting tab of the negative lead tab 142. The second connecting tab is parallel to the fifth plate portion 115 or the sixth plate portion 116.

[0177] It should be noted that the conductive posts in the battery 100 of the present application include a positive conductive post 131 and a negative conductive post 132, the lead tabs include a positive lead tab 141 and a negative lead tab 142, and the tabs include a positive tab and a negative tab. The positive lead tab 141 includes a first positive connecting tab 141a and a second positive connecting tab 141b, and the negative lead tab 142 includes a first negative connecting tab 142a and a second negative connecting tab 142b.

[0178] The spacer is arranged between the lead-out plate and the battery housing 110, and the conductive column passes through the spacer to be connected to the lead-out plate. The spacer can prevent the lead-out plate from directly contacting the battery housing 110, thereby preventing the battery housing 110 from being charged, thereby improving the safety performance of the battery 100.

[0179] In some embodiments of the present application, the spacer includes a support portion and an insulating portion connected to the support portion. The support portion is sandwiched between the end of the pole core 120 and the battery housing 110. The insulating portion cooperates with the lead tab and is sandwiched between the lead tab and the battery housing 110. In fact, not only is the insulating portion itself an insulating portion, but the support portion is also an insulating member. The support portion and the insulating portion can be an integrally formed part.

[0180] The insulating part is also constructed in an "L" shape and includes an insulating part vertical plate and an insulating part horizontal plate. The insulating part vertical plate is connected to the insulating part horizontal plate. The insulating part vertical plate is arranged between the first connecting plate and the side plate of the battery shell 110 in the length direction. The insulating part horizontal plate is arranged between the second connecting plate and a side plate of the battery shell 110 in the thickness direction.

[0181] The following briefly describes the battery pack of an embodiment of the present application.

[0182] As shown in Figure 37, the battery pack 1000 according to the embodiment of the present application includes the above-mentioned battery 100. Since the battery pack 1000 according to the embodiment of the present application is provided with the above-mentioned battery 100, the safety performance of the battery pack 1000 is stronger, and the power of the battery pack 1000 is also further increased.

[0183] The following briefly describes the vehicle 10000 according to an embodiment of the present application.

[0184] As shown in Figure 38, the vehicle 10000 according to the embodiment of the present application includes the above-mentioned battery pack 1000. Since the vehicle 10000 according to the embodiment of the present application is provided with the above-mentioned battery pack 1000, the endurance of the vehicle 10000 is significantly improved, and the electrical safety performance of the vehicle 10000 is also significantly improved.

[0185] In addition, as shown in Figure 39, in another embodiment of the present application, the vehicle 10000 includes the above-mentioned battery 100. By setting the battery 100 of the aforementioned embodiment, the endurance of the vehicle 10000 can be improved, and the electrical safety performance of the vehicle 10000 is also significantly improved.

[0186] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above 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 any one or more embodiments or examples.

[0187] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Images