Battery pack

Abstract

The utility model provides a battery and a battery pack, and the battery comprises a shell which comprises a side surface and an end surface; the pole is arranged on the side face and located at the end of the shell in the length direction, the pole comprises a first section and a second section, the first section is connected with the side face, and an angle is formed between the second section and the first section; the conducting bar comprises a welding part and a bridging part which are connected with each other, the welding part is used for being welded with the second section, the bridging part crosses the end face and comprises a transition section, and the transition section is parallel to the side face; and the insulating bracket is arranged at the end part of the shell and comprises an abutting part. The abutting part enables the transition section to be attached towards the side face. Therefore, the whole conducting bar is pressed on the shell and does not move relative to the shell, the second section of the pole and the welding part of the conducting bar can have the maximum contact area, and it is guaranteed that after the second section and the welding part are welded, the maximum binding force exists between the second section and the welding part.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, and particularly relates to a battery pack. Background Art

[0002] The battery pack is a key component in new energy vehicles. The battery pack includes a plurality of battery groups, and each battery group includes a plurality of batteries arranged in sequence. In order to connect a plurality of batteries in series, conductive bars need to be arranged between adjacent batteries. The two sides of the conductive bar are respectively welded to the positive electrode post and the negative electrode post of two batteries, so as to realize the series connection of the plurality of batteries end to end. However, affected by manufacturing errors and assembly errors, the conductive bar is prone to move in the extending direction of the battery group, resulting in a reduction in the contact area between the conductive bar and the electrode post, a reduction in the connection force after welding, and it is easy for the conductive bar to fall off relative to the electrode post after being used for a period of time. Summary of the Utility Model

[0003] Therefore, the technical problem to be solved by the utility model is to overcome the defect that the conductive bar is prone to move relative to the battery in the prior art, resulting in the conductive bar falling off from the electrode post after welding, so as to provide a battery group.

[0004] To solve the above problems, the utility model provides a battery group, including a plurality of batteries. Each battery includes: a housing, the housing includes a side surface and an end surface; an electrode post, arranged on the side surface and located at the end of the length direction of the housing, the electrode post includes a first section and a second section, the first section is connected to the side surface, and the second section is arranged at an angle with the first section; the battery group further includes: a conductive bar, used for connecting the electrode posts of adjacent batteries, or for connecting the electrode post and an external electrical connector, the conductive bar includes a welded part and a bridging part connected to each other, the welded part is used for welding with the second section, the bridging part crosses the end surface, the bridging part includes a transition section, and the transition section is parallel to the side surface; an insulating bracket, arranged at the end of the housing, the insulating bracket includes an abutting part, and the abutting part is used for pressing the transition section to prevent the transition section from moving in the direction away from the side surface.

[0005] Optionally, the abutting part includes a connecting arm and a clamping arm, the connecting arm is connected to the side surface, the clamping arm is arranged at an angle with the connecting arm, and pressing ribs are arranged on the surface of the clamping arm facing the side surface.

[0006] Optionally, in the direction perpendicular to the side surface, the projection dimension of the transition section on the second section and the dimension of the second section are in the range of 0.02 to 0.12.

[0007] Optionally, in the direction perpendicular to the side surface, the thickness of the abutting part is in the range of 0.5 mm to 2 mm.

[0008] Optionally, the thickness of the conductive bar is in the range of 0.5 mm to 2 mm.

[0009] Optionally, in a direction parallel to the side surface and the end surface, the ratio of the length of the abutting portion to the length of the transition section is in the range of 0.05 to 0.1.

[0010] Optionally, in a direction perpendicular to the side surface, the length of the welding portion is greater than or equal to 5 mm; and / or,

[0011] In a direction parallel to the side surface and the end surface, the edge of the welding portion facing the abutting portion is offset from the abutting portion and is located on the side of the abutting portion close to the pole column, or, in a direction parallel to the side surface and the end surface, the welding portion and the abutting portion have an overlapping part, and when the welding portion and the abutting portion have an overlapping part, the distance from the overlapping part to the welding portion is less than or equal to 2 mm.

[0012] Optionally, the insulating bracket further includes an insulating sleeve, the insulating sleeve is sleeved on the end of the housing, the abutting portion is arranged on the insulating sleeve, and the thickness of the part of the insulating sleeve clamped between the side surface and the transition section is in the range of 0.3 mm to 1.5 mm.

[0013] Optionally, the transition section and the welding portion are connected by a rounded corner structure, and the radius of curvature of the rounded corner structure is in the range of 0.3 mm to 2 mm.

[0014] Optionally, in a direction parallel to the side surface and the end surface, there are two oppositely arranged abutting portions, and the transition section is clamped between the two abutting portions.

[0015] Optionally, the pole column includes a first pole column and a second pole column with different polarities, the first pole column and the second pole column are respectively arranged at both ends of the side surface, in the same end of adjacent batteries, the conductive bar includes a first conductive bar and a second conductive bar, the multiple batteries include a first end battery, a second end battery and a middle battery located between the first end battery and the second end battery, the first conductive bar is arranged on the first end battery and is connected to the first pole column of the first end battery, and / or, the first conductive bar is arranged on the second end battery and is connected to the second pole column of the second end battery, an extraction portion is arranged on the first conductive bar, the second conductive bar includes two welding portions, the two welding portions are symmetrically arranged with respect to the bridging portion, and the two welding portions are respectively used for welding the two pole columns at the same end of two adjacent batteries.

[0016] Optionally, in the second conductive bar, one of the welding portions has a first projected area on the pole column, and the other welding portion has a second projected area on the pole column. Among the first projected area and the second projected area, the ratio of the smaller area to the larger area is in the range of 0.8 to 1.

[0017] Optionally, the side surface of the housing includes a first side surface and a second side surface, the pole column is arranged on the first side surface, and a recessed portion is arranged at the end of the second side surface, and the pole columns of adjacent batteries extend into the recessed portion.

[0018] The utility model has the following advantages:

[0019] By using the technical solution of the utility model, an abutting portion is provided on the insulating bracket. The abutting portion is used to press the transition section of the conductive bar against the side surface of the housing, so that the transition section fits against the side surface, preventing the transition section from moving in the direction away from the side surface of the housing. Therefore, the entire conductive bar is pressed tightly on the housing, and the conductive bar does not move relative to the housing. The second section of the pole column and the welding portion of the conductive bar can have the largest contact area. After the second section and the welding portion are welded, the maximum bonding force is ensured between the two, reducing or even eliminating the risk of the welding portion detaching from the second section. Therefore, the technical solution of the utility model solves the defect in the prior art that the conductive bar is prone to move relative to the battery, resulting in the conductive bar falling off from the pole column after welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 Shows a schematic structural diagram of the battery of the battery pack of the present utility model;

[0022] Figure 2 Shows Figure 1 A schematic structural diagram at the first side of the end of the battery in;

[0023] Figure 3 Shows Figure 1 A schematic structural diagram at the second side of the end of the battery in;

[0024] Figure 4 Shows Figure 1 A schematic diagram of the cooperation between the housing of the battery and the conductive bar in;

[0025] Figure 5 Shows Figure 1 A schematic diagram of the top view of the battery in;

[0026] Figure 6 Shows Figure 5 A schematic structural diagram at the abutting portion of the battery pack in;

[0027] Figure 7 Shows Figure 1 A schematic diagram at the pole column of the battery in (the welding portion and the abutting portion are misaligned);

[0028] Figure 8shows Figure 1 a schematic diagram of the battery pole in (the welding part and the abutting part have an overlapping part);

[0029] Figure 9 shows a schematic structural diagram of the battery pack of the present utility model;

[0030] Figure 10 shows Figure 9 a schematic structural diagram of the first end battery and the first conductive bar in ;

[0031] Figure 11 shows Figure 9 a schematic diagram of the connection between the first end battery and the middle battery in through the second conductive bar structure;

[0032] Figure 12 shows Figure 9 a schematic diagram of the connection between adjacent middle batteries in through the second conductive bar;

[0033] Figure 13 shows Figure 9 a schematic structural diagram of the second end battery and the first conductive bar in ;

[0034] Figure 14 shows Figure 9 a schematic diagram of the connection between the second end battery and the middle battery in through the second conductive bar structure;

[0035] Figure 15 shows Figure 9 a schematic diagram of the projections of the two welding parts of the second conductive bar of the battery pack on the first pole and the second pole in (the structure of the insulating bracket is omitted).

[0036] Explanation of reference numerals:

[0037] 10. Housing; 11. Side surface; 111. First side surface; 112. Second side surface; 113. Concave part; 12. End face; 20. Pole; 21. First section; 22. Second section; 201. First pole; 202. Second pole; 30. Conductive bar; 31. Welding part; 32. Cross-connecting part; 321. Transition section; 33. Rounded corner structure; 34. Lead-out part; 301. First conductive bar; 302. Second conductive bar; 40. Insulating bracket; 41. Abutting part; 411. Connecting arm; 412. Clamping arm; 413. Pressing rib; 42. Insulating sleeve; 100. Battery; 101. First end battery; 102. Second end battery; 103. Middle battery. Detailed implementation manners

[0038] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0039] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0040] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0041] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0042] Such as Figures 1 to 8As shown, an embodiment of the battery pack according to the present application includes a plurality of batteries 100. Each battery includes a housing 10 and a terminal 20. The battery pack further includes a conductive busbar 30 and an insulating bracket 40. Among them, the housing 10 includes a side surface 11 and an end surface 12. The terminal 20 is disposed on the side surface 11 and is located at the end of the housing 10 in the length direction. The terminal 20 includes a first section 21 and a second section 22. The first section 21 is connected to the side surface 11, and the second section 22 is disposed at an angle to the first section 21. The conductive busbar 30 is used to connect the terminals 20 of adjacent batteries 100, or to connect the terminal 20 and an external electrical connector. The conductive busbar 30 includes a welded portion 31 and a bridging portion 32 that are connected to each other. The welded portion 31 is used to be welded to the second section 22, and the bridging portion 32 straddles the end surface 12. The bridging portion 32 includes a transition section 321, and the transition section 321 is parallel to the side surface 11. The insulating bracket 40 is disposed at the end of the housing 10. The insulating bracket 40 includes an abutting portion 41, and the abutting portion 41 is used to press against the transition section 321 so that the transition section 321 fits against the side surface 11, that is, to prevent the transition section 321 from moving in a direction away from the side surface 11.

[0043] With the technical solution of this embodiment, the insulating bracket 40 is provided with an abutting portion 41. The abutting portion 41 is used to press the transition section 321 of the conductive busbar 30 against the side surface of the housing 10, so that the transition section 321 fits against the side surface 11, that is, to prevent the transition section 321 from moving in a direction away from the side surface 11 of the housing 10. Therefore, the entire conductive busbar 30 is pressed tightly against the housing 10, and the conductive busbar 30 does not move relative to the housing 10. The second section 22 of the terminal 20 and the welded portion 31 of the conductive busbar 30 can have the largest contact area. After the second section 22 and the welded portion are welded, the two have the largest bonding force, reducing or even eliminating the risk of the welded portion 31 detaching from the second section 22. Therefore, the technical solution of this embodiment solves the defect in the prior art that the conductive busbar is prone to move relative to the battery, resulting in the detachment of the conductive busbar from the terminal after welding.

[0044] It should be noted that the above-mentioned external electrical connector includes an output terminal support and a high-voltage copper busbar.

[0045] As Figure 1 shown, and described in Figure 1 the above-mentioned direction, the left and right surfaces of the housing 10 of the battery are large surfaces, that is, the side surfaces 11. The two side surfaces 11 are respectively a first side surface 111 and a second side surface 112. The front and rear surfaces of the housing 10 of the battery are small surfaces, and the upper and lower surfaces of the housing 10 of the battery are end surfaces 12.

[0046] Of course, those skilled in the art can determine the placement attitude of the housing 10 according to actual needs, and are not limited to Figure 1 the attitude shown. For example, the housing 10 can be arranged in the horizontal direction, that is, the long side of the side surface 11 faces horizontally.

[0047] As Figure 2 and Figure 4 described above, a terminal post 20 is provided on the side surface 11 of the housing 10, and the terminal post 20 is connected to the tab of the battery cell within the housing 10. Among them, the terminal post 20 includes a first section 21 and a second section 22. The first section 21 is connected to the side surface 11 and is located at the end position of the side surface 11. The second section 22 is connected to the first section 21 and extends in a direction away from the side surface 11.

[0048] Optionally, in this embodiment, the second section 22 is perpendicular to the first section 21, that is, the cross-sections of the two are in an "L" shaped structure, and the second section 22 is perpendicular to the side surface 11. Of course, those skilled in the art can adaptively adjust the angle formed by the second section 22 and the first section 21. For example, the two can be at 60°, 75°, etc.

[0049] Furthermore, the conductive busbar 30 is used to connect multiple batteries in series or in parallel, or to connect the terminal post 20 of the battery and an external electrical connector. As Figure 2 and Figure 4 shown, the conductive busbar 30 includes a welding portion 31, a bridging portion 32, and a transition section 321. Among them, the welding portion 31 is parallel to the second section 22 and is welded to the second section 22, that is, the welding portion 31 is perpendicular to the side surface 11. The bridging portion 32 is used to span across the end face 12 of the housing 10. The transition section 321 serves to connect the welding portion 31 and the bridging portion 32, and the transition section 321 is arranged parallel to the side surface 11.

[0050] In this embodiment, the bridging portion 32 is arranged parallel to the welding portion 31, and the transition section 321 is perpendicular to both the bridging portion 32 and the welding portion 31.

[0051] Of course, those skilled in the art can determine the angles formed among the welding portion 31, the bridging portion 32, and the transition section 321 according to actual needs.

[0052] As Figure 2 and Figure 4 shown, the insulating bracket 40 is arranged at the end position of the housing 10 and covers the side surface 11. The insulating bracket 40 is provided with an abutting portion 41. As Figure 5 and Figure 6 can be seen, the abutting portion 41 can press the transition section 321 towards the side surface 11, so that the transition section 321 is closely attached to the side surface 11.

[0053] Furthermore, as Figure 4It can be seen that since the wall thickness of the transition section 321 occupies a certain dimension of the second section 22, the contact area between the welding part 31 and the second section 22 is correspondingly reduced. By providing the abutting part 41, the transition section 321 can be closely attached to the side surface 11 of the housing 10, so that the contact area between the welding part 31 and the second section 22 is maximized, preventing the conductive bar 30 from Figure 4 causing crosstalk in the left-right direction, ensuring a strong connection force after the welding part 31 and the second section 22 are welded, and avoiding their separation.

[0054] As Figure 5 and Figure 6 shown, in the technical solution of this embodiment, the abutting part 41 includes a connecting arm 411 and a clamping arm 412. The connecting arm 411 is connected to the side surface 11, and the clamping arm 412 is arranged at an angle with the connecting arm 411. A pressing rib 413 is provided on the surface of the clamping arm 412 facing the side surface 11.

[0055] Specifically, one end of the connecting arm 411 is connected to the insulating bracket 40, and the other end extends in a direction away from the side surface 11. The clamping arm 412 is connected to the connecting arm 411 and bends inward. The side part of the transition section 321 is inserted into the inner side of the clamping arm 412, and the clamping arm 412 presses the transition section 321 against the insulating bracket 40, that is, against the side surface 11.

[0056] Optionally, in this embodiment, the connecting arm 411 is perpendicular to the side surface 11, and the clamping arm 412 is parallel to the side surface 11, that is, the clamping arm 412 is perpendicular to the connecting arm 411. Of course, those skilled in the art can determine the setting angle between the connecting arm 411 and the clamping arm 412 according to actual needs.

[0057] As Figure 6 can be seen, a pressing rib 413 is provided on the surface of the clamping arm 412 facing the side surface 11. The pressing rib 413 has a pointed structure, and the end of the pressing rib 413 abuts against the transition section 321, so as to better press the transition section 321 against the side surface 11.

[0058] As Figure 4 shown, in the technical solution of this embodiment, in the direction perpendicular to the side surface 11, the projection dimension d1 of the transition section 321 on the second section 22 and the dimension d2 of the second section 22 are in the range of 0.02 to 0.12.

[0059] The direction perpendicular to the side surface 11, that is, Figure 4 the left-right direction shown.

[0060] Figure 4 The d1 described in Figure 4d2 in it, that is, the length of the second section 22 in the direction perpendicular to the side surface 11.

[0061] Furthermore, the value of d1 to d2 mentioned above should neither be too large nor too small. If the ratio is too large, it means that the wall thickness of the transition section 321 occupies too much space of the second section 22, and it is impossible to ensure that there is enough welding area between the second section 22 and the welding part 31, affecting the connection force. If the ratio is too small, it means that the wall thickness of the transition section 321 is too small relative to the size of the second section 22, and the flow-through capacity of the transition section 321 is insufficient.

[0062] Therefore, optionally in this embodiment, the value of d1 to d2 is in the range of 0.02 to 0.12.

[0063] For example, the value of d1 to d2 can be 0.02, 0.04, 0.06, 0.08, 0.1 or 0.12.

[0064] As Figure 6 shown, in the technical solution of this embodiment, in the direction perpendicular to the side surface 11, the thickness d3 of the abutting part 41 is in the range of 0.5 mm to 2 mm.

[0065] From Figure 6 it can be seen that the thickness of the abutting part 41 refers to the thickness value of the clamping arm 412 in the direction perpendicular to the side surface 11.

[0066] Furthermore, the value of d3 mentioned above should neither be too small nor too large. If the value is too small, the strength of the clamping arm 412 is limited, and it is easy to have fatigue fracture when clamping the transition section 321. If the value is too large, the outer end of the clamping arm 412 is too close to the welding position, and it is easy to cause the clamping arm 412 to melt due to heat during welding.

[0067] Therefore, optionally in this embodiment, the value of d3 is in the range of 0.5 mm to 2 mm.

[0068] For example, the value of d3 can be 0.5 mm, 0.7 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm or 2 mm.

[0069] As Figure 4 shown, in the technical solution of this embodiment, the thickness d4 of the busbar 30 is in the range of 0.5 mm to 2 mm.

[0070] Specifically, the value of d4 should neither be too small nor too large. If the value is too small, it will lead to insufficient flow-through capacity of the busbar 30. If the value is too large, it will lead to a relatively large wall thickness at the transition section 321, occupying too much welding space.

[0071] Therefore, optionally in this embodiment, the value of d4 ranges from 0.5 mm to 2 mm.

[0072] For example, the value of d4 can be 0.5 mm, 0.7 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, or 2 mm.

[0073] As Figure 5 shown, in the technical solution of this embodiment, along the direction L parallel to the side surface 11 and the end surface 12, the ratio of the length d5 of the abutting portion 41 to the length d6 of the transition section 321 ranges from 0.05 to 0.1.

[0074] Among them, d5 is the length value of the clamping arm 412 along the direction L. d6 is the length value of the transition section 321 along the direction L.

[0075] Furthermore, the value of d5:d6 cannot be too large or too small. If this ratio is too large, it means that the length of the clamping arm 412 is relatively long compared to the transition section 321, which will affect and interfere with welding. If this ratio is too small, it means that the length of the clamping arm 412 is relatively small compared to the transition section 321, which will reduce the strength of the clamping arm 412 and the connection strength.

[0076] Therefore, optionally in this embodiment, the value of d5:d6 ranges from 0.05 to 0.1.

[0077] For example, the value of d5:d6 can be 0.05, 0.06, 0.07, 0.08, 0.09, or 0.1.

[0078] As Figure 7 shown, in this embodiment, the edge of the welding portion 31 facing the abutting portion 41 is misaligned with the abutting portion 41 and is located on the side of the abutting portion 41 close to the terminal post 20. Specifically, from Figure 5 and Figure 6 it can be seen that along the L direction, the length of the welding portion 31 is less than the length of the transition section 321, and the abutting portion 41 is clamped at the side position of the transition section 321. Along the Figure 7 shown up and down direction (perpendicular to the direction L), the clamping arm 412 of the abutting portion 41 extends downward and has an overlapping portion with the welding portion 31.

[0079] As Figure 8 shown, in another embodiment, along the direction L, the welding portion 31 can have a larger length such that there is an overlapping portion between the welding portion 31 and the clamping arm 412. At this time, the distance d7 between the clamping arm 412 and the welding portion 31 should be as small as possible so that the clamping arm 412 can completely press the transition section 321 against the side surface 11 to prevent the conductive busbar 30 from moving.

[0080] Optionally, the value of d7 is less than or equal to 2 mm, and the value of d7 should be as close to zero as possible.

[0081] As Figure 6 shown, especially when the length d9 of the welding part 31 is greater than or equal to 5 mm (the dimension of the welding part 31 along the direction perpendicular to the side surface 11), it is equivalent to having a longer force arm. At this time, the value of d7 should be as small as possible.

[0082] As Figure 4 shown, in the technical solution of this embodiment, the insulating bracket 40 further includes an insulating sleeve 42. The insulating sleeve 42 is sleeved on the end of the housing 10, and the abutting part 41 is arranged on the insulating sleeve 42. The thickness d8 of the part of the insulating sleeve 42 clamped between the side surface 11 and the transition section 321 is in the range of 0.3 mm to 1.5 mm.

[0083] Specifically, the insulating sleeve 42 is padded under the conductive busbar 30. The part of the insulating sleeve 42 on the side surface plays a role in supporting the transition section 321 and insulation. Therefore, under the condition of meeting the requirements of creepage distance and electrical clearance, the thickness of the part of the insulating sleeve 42 clamped between the side surface 11 and the transition section 321 can be reduced as much as possible, so as to reduce the space of the second section 22 occupied by the thickness of the conductive busbar 30 and the raised part of the insulating sleeve 42, and increase the welding area between the welding part 31 and the second section 22.

[0084] Optionally, the value of d8 is in the range of 0.3 mm to 1.5 mm.

[0085] For example, the value of d8 can be 0.3 mm, 0.5 mm, 0.7 mm, 1 mm, 1.2 mm, 1.4 mm or 1.5 mm.

[0086] As Figure 4 shown, in the technical solution of this embodiment, the transition section 321 and the welding part 31 are connected by a rounded corner structure 33, and the radius of curvature d9 of the rounded corner structure 33 is in the range of 0.3 mm to 2 mm.

[0087] Specifically, the setting of the rounded corner structure 33 prevents the appearance of a sharp corner structure at the connection position between the transition section 321 and the welding part 31, thereby preventing damage to the insulating bracket 40 or the housing 10. Since the rounded corner structure 33 cannot be welded to the second section 22, the value of d9 can be made smaller, so that the size of the rounded corner structure 33 is smaller, and thus the space of the second section 22 is occupied as little as possible.

[0088] Optionally, d9 is in the range of 0.3 mm to 2 mm.

[0089] For example, the value of d9 can be 0.3 mm, 0.6 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, or 2 mm.

[0090] As Figure 5 and Figure 6 shown, in the technical solution of this embodiment, there are two oppositely arranged abutting parts 41, and the transition section 321 is clamped between the two abutting parts 41.

[0091] Specifically, the two abutting parts 41 are arranged at intervals along the direction L, the openings formed by the clamping arms 412 of the two abutting parts 41 face each other, and the two clamping arms 412 are inserted from both sides of the abutting part 41, so as to fix the position of the conductive row 30 in the direction L and prevent the conductive row 30 from moving in the direction L relative to the normal of the housing 10.

[0092] As Figure 9 shown, the battery pack according to the present application includes a plurality of adjacent batteries 100, and the battery 100 is the above-mentioned battery.

[0093] As Figures 10 to 14 shown, further, among the plurality of batteries 100, the first end battery 101 and the second end battery 102 are respectively located at both ends, and the remaining batteries 100 located between the first end battery 101 and the second end battery 102 are middle batteries 103.

[0094] Among any two adjacent batteries 100, the first side surface 111 of one battery 100 is oppositely arranged to the second side surface 112 of the other battery 100.

[0095] In this embodiment, the batteries 100 are connected in series, so the series connection between the batteries 100 will be described first.

[0096] In order to realize the series connection of the plurality of batteries 100 through the conductive row 30 and lead out the pole columns 20 of the batteries 100 at the ends, the batteries 100 and the conductive row in this embodiment are arranged in the following manner.

[0097] From Figure 1 it can be seen that the pole column 20 includes a first pole column 201 and a second pole column 202 with different polarities, and the first pole column 201 and the second pole column 202 are respectively arranged at both ends of the side surface 11. Specifically, one of the first pole column 201 and the second pole column 202 is a positive pole column, and the other is a negative pole column.

[0098] From Figure 12 it can be seen that in the same end of adjacent batteries 100, the polarities of the pole columns 20 are different, that is, between adjacent batteries 100, one battery 100 is in an inverted state relative to the other battery 100.

[0099] Furthermore, the busbar 30 includes a first busbar 301 which is used to connect to the pole 20 of the battery 100 at the end and connect the pole 20 of the battery 100 at the end to an external electrical connector. Therefore, a lead-out portion 34 is provided on the first busbar 301, and the lead-out portion 34 can be connected to structures such as external circuits and terminals.

[0100] In this embodiment, two first busbars 301 are provided.

[0101] As Figure 10 shown, one of the first busbars 301 is disposed on the first end battery 101 and connected to the first pole 201 of the first end battery 101. The welding portion 31 of the first busbar 301 is connected to the first pole 201 of the first end battery 101, and the lead-out portion 34 is provided on the bridging portion 32 of the first busbar 301, so as to connect the first pole 201 of the first end battery 101 to an external electrical connector.

[0102] As Figure 13 shown, the other first busbar 301 is disposed on the second end battery 102 and connected to the second pole 202 of the second end battery 102. The welding portion 31 of the first busbar 301 is connected to the second pole 202 of the second end battery 102, and the lead-out portion 34 is provided on the welding portion 31 of the first busbar 301, so as to connect the second pole 202 of the second end battery 102 to an external electrical connector.

[0103] Furthermore, the second busbar 302 includes two welding portions 31 which are symmetrically arranged with respect to the bridging portion 32. As Figure 2 and Figure 12 shown, the cross-sectional shape of the second busbar 302 is generally in a "J" - shaped structure, and the two welding portions 31 are respectively used for welding to the first pole 201 and the second pole 202 of the adjacent battery 100. The bridging portion 32 straddles the end face 12 of the housing 10 of the battery, so that the two welding portions 31 can respectively cooperate with the second segments 22 of the batteries 100 on both sides.

[0104] In this embodiment, multiple second busbars 302 are provided, and their connection methods include the following three types.

[0105] One type is that the second busbar 302 connects the first end battery 101 and the adjacent middle battery 103. As Figure 11 shown, specifically, the two welding portions 31 of the second busbar 302 are respectively used for welding to the second pole 202 of the first end battery 101 and the first pole 201 of the adjacent middle battery 103.

[0106] Another way is that the two welding parts 31 are respectively used for welding with the first pole column 201 and the second pole column 202 of two adjacent middle batteries 103. As Figure 12 shown, specifically, among two adjacent middle batteries 103, the two welding parts 31 of the second conductive row 302 are respectively used for welding with the first pole column 201 of one middle battery 103 and the second pole column 202 of another middle battery 103.

[0107] The third way is that the second conductive row 302 is connected to the second end battery 102 and the adjacent middle battery 103. As Figure 14 shown, the two welding parts 31 of the second conductive row 302 are respectively used for welding with the first pole column 201 of the second end battery 102 and the second pole column 202 of the adjacent middle battery 103.

[0108] Those skilled in the art can understand that the description is made in Figure 9 the described direction, Figure 10 which is Figure 9 the perspective of the left position at the upper part of Figure 11 which is Figure 9 the perspective of the left position at the bottom of Figure 12 which is Figure 9 the perspective of the middle position at the upper part of Figure 13 which is Figure 9 the perspective of the right position at the upper part of Figure 14 which is Figure 9 the perspective of the right position at the lower part of

[0109] Through the above-mentioned first conductive row 301 and second conductive row 302, the series connection of the heads and tails of multiple batteries 100 is realized (the first pole columns 201 and second pole columns 202 of multiple batteries 100 form a connection similar to an S shape), and the first pole column 201 of the first end battery 101 and the second pole column 202 of the second end battery 102 are connected to external electrical connectors, so as to realize the connection between the battery pack and the electrical equipment.

[0110] Furthermore, the batteries 100 in the above-mentioned battery pack can also be in parallel. In this implementation, the adjacent batteries 100 are not installed upside down, that is, at the same end of the battery pack, the polarities of the pole columns 20 of each battery 100 are the same. For example, in Figure 9 the shown direction, the pole columns 20 at the upper ends of each battery 100 are all the first pole columns 201, and the pole columns 20 at the lower ends of each battery 100 are all the second pole columns 202.

[0111] In the parallel implementation mode of each battery 100, the two welding parts 31 of the second conductive bar 302 are respectively welded to the same-pole electrode columns 20 of two adjacent batteries 100. For example, the two welding parts 31 are respectively welded to the first electrode column 201 of the adjacent battery 100, or the two welding parts 31 are respectively welded to the second electrode column 202 of the adjacent battery 100. With such a setting, the parallel connection of each battery 100 in the battery pack can be realized.

[0112] It can be seen from this that in the above-mentioned second conductive bar 302, the two welding parts 31 are respectively welded to the second section 22 of the electrode column 20 of the adjacent battery 100. According to whether multiple batteries 100 are in series or parallel, the two welding parts 31 are respectively welded to the non-same-pole electrode column 20 or the same-pole electrode column 20 of the adjacent battery 100.

[0113] As Figure 15 shown, in the technical solution of this embodiment, in the second conductive bar 302, one of the welding parts 31 has a first projected area S1 on the electrode column 20, and the other welding part 31 has a second projected area S2 on the electrode column 20. Among the first projected area S1 and the second projected area S2, the ratio of the smaller area to the larger area is greater than or equal to 80%.

[0114] Taking Figure 15 the series implementation mode of each battery shown as an example, as described above, the two welding parts 31 of the second conductive bar 302 are respectively connected to the first electrode column 201 and the second electrode column 202 of two adjacent batteries 100. In Figure 15 , the right welding part 31 has a first projected area S1 on the second section 22 of the first electrode column 201, and the area occupied by the "X" shape shows the range of S1. The left welding part 31 has a second projected area S2 on the second section 22 of the second electrode column 202, and the area occupied by the "X" shape shows the range of S2.

[0115] As Figure 15 shown, in the right welding part 31, since its transition section 321 occupies a part of the space of the second section 22, and there is no situation where the transition section 321 occupies the welding space in the left welding part 31, so S1 is slightly smaller than S2. Further, by providing the abutting part 41 on the insulating bracket 40, the second conductive bar 302 can be clamped on the side surface 11 of the housing 10 of the battery 100 to prevent the second conductive bar 302 from moving relative to the housing 10 of the battery 100. Therefore, the solution of this embodiment can make S1 as large as possible and as close to S2 as possible.

[0116] Therefore, in this embodiment, the ratio of S1 to S2 is in the range of 0.8 to 1 (i.e., more than 80%), so that the welding spaces of the two welding parts 31 and the pole column 20 are substantially equivalent, facilitating welding. Moreover, when the current flows, the overcurrent is uniform, and the consistency between the single cells 100 will not be affected due to uneven heat generation caused by excessive local impedance.

[0117] As Figure 2 , Figures 10 to 14 shown, a recessed portion 113 is provided at the end of the second side surface 112. When assembling the battery pack, the pole columns 20 of adjacent batteries 100 extend into the recessed portion 113, thereby making the assembly between the respective batteries 100 more compact.

[0118] Optionally, recessed portions 113 are provided at both ends of the second side surface 112.

[0119] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A battery pack, characterized in that, Comprising a plurality of batteries (100), the batteries (100) comprising: A housing (10), the housing (10) comprising a side surface (11) and an end surface (12); A pole (20), provided on the side surface (11) and located at an end of the housing (10) in the length direction thereof, the pole (20) comprising a first section (21) and a second section (22), the first section (21) being connected to the side surface (11), and the second section (22) being disposed at an angle to the first section (21); The battery pack further comprises: A conductive busbar (30) for connecting the poles (20) of adjacent batteries (100), or for connecting the pole (20) and an external electrical connector, the conductive busbar (30) comprising a welded portion (31) and a bridging portion (32) connected to each other, the welded portion (31) being used for welding with the second section (22), the bridging portion (32) spanning the end surface (12), the bridging portion (32) comprising a transition section (321), the transition section (321) being parallel to the side surface (11); An insulating bracket (40), provided at an end of the housing (10), the insulating bracket (40) comprising an abutting portion (41), the abutting portion (41) being used for pressing against the transition section (321) to prevent the transition section (321) from moving in a direction away from the side surface (11).

2. The battery pack according to claim 1, wherein, The abutting portion (41) comprises a connecting arm (411) and a clamping arm (412), the connecting arm (411) being connected to the side surface (11), the clamping arm (412) being disposed at an angle to the connecting arm (411), and a pressing rib (413) being provided on a surface of the clamping arm (412) facing the side surface (11).

3. The battery pack according to claim 1, characterized in that, In a direction perpendicular to the side surface (11), a projection dimension (d1) of the transition section (321) on the second section (22) and a dimension (d2) of the second section (22) are in a range of 0.02 to 0.

12.

4. The battery pack according to claim 1, characterized in that, In a direction perpendicular to the side surface (11), a thickness (d3) of the abutting portion (41) is in a range of 0.5 mm to 2 mm.

5. The battery pack according to claim 1, wherein A thickness (d4) of the conductive busbar (30) is in a range of 0.5 mm to 2 mm.

6. The battery pack according to claim 1, wherein, In a direction (L) parallel to the side surface (11) and the end surface (12), a ratio of a length (d5) of the abutting portion (41) to a length (d6) of the transition section (321) is in a range of 0.05 to 0.

1.

7. The battery pack according to claim 1, wherein, In a direction perpendicular to the side surface (11), a length (d9) of the welded portion (31) is greater than or equal to 5 mm; and / or, In the direction (L) parallel to the side surface (11) and the end surface (12), the edge of the welding portion (31) facing the abutting portion (41) is offset from the abutting portion (41) and is located on the side of the abutting portion (41) close to the pole column (20). Or, in the direction (L) parallel to the side surface (11) and the end surface (12), the welding portion (31) and the abutting portion (41) have an overlapping portion. When the welding portion (31) and the abutting portion (41) have an overlapping portion, the distance (d7) from the overlapping portion to the welding portion (31) is less than or equal to 2 mm.

8. The battery pack according to claim 1, characterized in that, The insulating bracket (40) further includes an insulating sleeve (42). The insulating sleeve (42) is sleeved on the end of the housing (10). The abutting portion (41) is provided on the insulating sleeve (42). The thickness (d8) of the portion of the insulating sleeve (42) clamped between the side surface (11) and the transition section (321) is in the range of 0.3 mm to 1.5 mm.

9. The battery pack according to claim 1, wherein The transition section (321) and the welding portion (31) are connected by a rounded corner structure (33). The radius of curvature (d9) of the rounded corner structure (33) is in the range of 0.3 mm to 2 mm.

10. The battery pack according to claim 1, characterized in that, In the direction (L) parallel to the side surface (11) and the end surface (12), there are two oppositely arranged abutting portions (41), and the transition section (321) is clamped between the two abutting portions (41).

11. The battery pack according to claim 1, wherein, The pole column (20) includes a first pole column (201) and a second pole column (202) with different polarities. The first pole column (201) and the second pole column (202) are respectively arranged at both ends of the side surface (11). In the same end of adjacent batteries (100), the conductive bar (30) includes a first conductive bar (301) and a second conductive bar (302). The plurality of batteries (100) include a first end battery (101), a second end battery (102), and a middle battery (103) located between the first end battery (101) and the second end battery (102). The first conductive bar (301) is arranged on the first end battery (101) and is connected to the first pole column (201) of the first end battery (101), and / or the first conductive bar (301) is arranged on the second end battery (102) and is connected to the second pole column (202) of the second end battery (102). An extraction portion (34) is provided on the first conductive bar (301). The second conductive bar (302) includes two welding portions (31). The two welding portions (31) are symmetrically arranged with respect to the bridging portion (32). The two welding portions are respectively used for welding the two pole columns at the same end of two adjacent batteries.

12. The battery pack according to claim 11, wherein, Among the second conductive bars (302), one of the welding parts (31) has a first projected area (S1) on the pole column (20), and the other welding part (31) has a second projected area (S2) on the pole column (20). Among the first projected area (S1) and the second projected area (S2), the ratio of the smaller area to the larger area is in the range of 0.8 to 1.

13. The battery pack according to claim 1, wherein The side surface (11) of the housing (10) includes a first side surface (111) and a second side surface (112). The pole column (20) is disposed on the first side surface (111), and a recess (113) is provided at the end of the second side surface (112). The pole column (20) of the adjacent battery (100) extends into the recess (113).

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