Busbar and battery pack

Abstract

The utility model belongs to the field of batteries, and particularly relates to a busbar and a battery pack. The busbar comprises a plate-shaped busbar main body; n electric connection areas and n-1 fusing areas are arranged on the plate-shaped busbar main body along the axial direction of the plate-shaped busbar main body; the electric connection areas and the fusing areas are alternately arranged one by one, the n electric connection areas and the n single batteries are in one-to-one correspondence, and each electric connection area is used for being connected with a polar terminal, located on the same side, of the corresponding single battery in the battery pack; and the overcurrent area of the fusing region is smaller than that of the electric connection region. When any single battery is short-circuited, the fusing area connected with the electric connection area of the single battery is rapidly fused at high temperature generated by large current, so that the single battery is disconnected, the influence of short circuit on normal use of other single batteries is avoided, the whole battery pack is protected, and the safety of the battery pack is improved; the whole battery pack does not need to be maintained or replaced due to damage of individual single batteries, so that the maintenance cost is saved.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, in particular to a bus bar and a battery pack. Background Art

[0002] Existing battery packs are usually composed of multiple single cells connected in series, in parallel, or in series-parallel connection. The conductor part used to achieve the series, parallel, or series-parallel connection is called a busbar.

[0003] Due to the differences in single cells, short circuit problems may occur in individual single cells during the operation of the battery pack. If the short-circuited single cell cannot be disconnected in time, the entire battery module will be destroyed. Utility Model Content

[0004] The utility model aims to provide a busbar and a battery pack, which can automatically disconnect any single battery in the battery pack when it is short-circuited, so as to protect the entire battery pack and improve the safety performance of the battery pack.

[0005] The technical solution of the utility model is to provide a busbar for realizing the electrical connection of n single cells in the same battery pack, wherein n is an integer greater than 1; the utility model is special in that: it comprises a plate-shaped busbar body; the plate-shaped busbar body is provided with n electrical connection areas and n-1 fuse areas along its axial direction;

[0006] The electrical connection areas and the fuse areas are arranged alternately one by one, and two adjacent electrical connection areas are connected by a fuse area;

[0007] The n electrical connection areas correspond to the n single cells one by one, and each electrical connection area is used to connect to the polarity terminal located on the same side of the corresponding single cell in the battery pack;

[0008] The flow area of ​​the fuse zone is smaller than the flow area of ​​the electrical connection zone.

[0009] The utility model adopts a plate-shaped busbar to realize the electrical connection of multiple single cells in a battery pack, and forms multiple electrical connection areas corresponding to the single cells one by one and a fuse area located between two adjacent electrical connection areas on the plate-shaped busbar. The structural design makes the flow area of ​​the fuse area smaller than the flow area of ​​the electrical connection area. When any single cell is short-circuited, the fuse area connected to its electrical connection area will quickly melt under the high temperature generated by the large current, so that the single cell is disconnected, avoiding the normal use of other single cells being affected by the short circuit, protecting the entire battery pack, improving the safety of the battery pack, and eliminating the need to repair or replace the entire battery pack due to damage to individual single cells, thereby saving repair costs.

[0010] Furthermore, the utility model has at least the following two structures of the fuse zone:

[0011] A through hole can be opened in the main body area of ​​the plate-shaped busbar between two adjacent electrical connection areas to form a fuse area of ​​the first structure. Preferably, the through hole is located at the geometric center of the fuse area.

[0012] A notch may also be provided in the plate-shaped busbar body region between two adjacent electrical connection regions to form a fuse region of the second structure. Preferably, there are two notches, which are symmetrical with respect to the central axis of the plate-shaped busbar body.

[0013] Furthermore, each electrical connection area is provided with at least one screw hole for fixed connection with the polarity terminal. Compared with other welding, riveting or clamping methods, the screw connection method is easier to connect and has a simpler structure.

[0014] The utility model also provides a battery pack, which is special in that it includes n single batteries and the above-mentioned busbar;

[0015] The n electrical connection areas of the busbar are connected to polarity terminals of the corresponding single cells located on the same side.

[0016] Furthermore, the battery pack further comprises a housing; n single cells are placed side by side in the housing;

[0017] The inner cavity of the shell is connected with the inner cavities of all the single cells;

[0018] The outer shell top plate is provided with avoidance holes corresponding to the polarity terminals of each single battery; each single battery polarity terminal extends out of the corresponding avoidance hole, and the outer shell top plate area corresponding to the avoidance hole is fixedly sealed with the single battery shell;

[0019] The n electrical connection areas of the busbar are connected to the second end surfaces of the polarity terminals of the corresponding single cells located on the same side and extending out of the avoidance holes.

[0020] Furthermore, the battery pack further comprises a heat transfer tube; a heat transfer tube clamping portion is provided at the portion where the polarity terminal of the single battery extends out of the avoidance hole; and the heat transfer tube is fixed in the heat transfer tube clamping portion.

[0021] A heat transfer tube clamping part is provided at the part where the polarity terminal extends out of the avoidance hole, and the heat transfer tube is fixed in the heat transfer tube clamping part, so that the heat transfer tube is directly connected to the polarity terminal of the battery pack, and the heat on the polarity terminal where the heat is relatively concentrated can be timely discharged, thereby improving the heat dissipation effect of the battery pack. In addition, when the temperature of the battery pack is lower than the set threshold, the battery pack is heated by passing a heat transfer medium with a higher temperature into the heat transfer tube; by controlling the temperature of the heat transfer medium, it can be ensured that the battery pack always operates at a normal operating temperature.

[0022] Furthermore, the heat transfer tube clamping portion is a through hole or a through groove provided at a portion where the polarity terminal of the single battery extends out of the avoidance hole.

[0023] The beneficial effects of the utility model are:

[0024] 1. The utility model adopts a plate-shaped busbar with a simple structure to realize the electrical connection of multiple single cells in a battery pack, and forms multiple electrical connection areas corresponding to the single cells one by one on the plate-shaped busbar, as well as a fuse area located between two adjacent electrical connection areas. The structural design makes the flow area of ​​the fuse area smaller than the flow area of ​​the electrical connection area. When any single cell is short-circuited, the fuse area connected to its electrical connection area will quickly melt under the high temperature generated by the large current, thereby disconnecting the single cell, avoiding the normal use of other single cells affected by the short circuit, protecting the entire battery pack, and improving the safety of the battery pack. There is no need to repair or replace the entire battery pack due to damage to individual single cells, thus saving repair costs.

[0025] 2. In a battery pack having a shell, the utility model connects the inner cavity of the shell with the inner cavities of all single cells; the single cells in the battery pack can be placed in a unified electrolyte and / or gas environment, ensuring the uniformity of the single cells; and improving the performance and charge-discharge cycle life of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of the busbar in Example 1;

[0027] Figure 2 It is a partial enlarged structural schematic diagram of the busbar of Example 1;

[0028] Figure 3 This is a schematic diagram of the partial explosion structure of the battery pack of Example 1;

[0029] Figure 4 This is a schematic diagram of the structure in which a busbar is fixed to the polarity terminal on one side of the battery pack of Example 1;

[0030] Figure 5 This is a schematic diagram of the partial structure of the battery pack without the end plate in Example 1;

[0031] Figure 6 It is a schematic diagram of the partial structure of the battery pack of Example 2;

[0032] Figure 7 is a schematic diagram of the structure of a single cell in Example 2;

[0033] Figure 8 This is a schematic diagram of the structure of the busbar in Example 3;

[0034] Fig. 9 It is a partial enlarged structural schematic diagram of the busbar of Example 3;

[0035] Fig.10 This is a schematic diagram of the structure of the battery pack of Example 3;

[0036] Fig.11 This is a schematic diagram of the partial structure of the battery pack of Example 3;

[0037] The accompanying drawings in the figure are marked as follows:

[0038] 1. Busbar; 11. Electrical connection area; 111. Screw hole; 12. Fuse area; 121. Through hole; 122. Notch; 2. Shell; 21. Shell bottom plate; 22. Shell top plate; 3. Single battery; 31. Polarity terminal; 311. First end face; 312. Side wall; 32. Through groove; 33. Pole adapter; 4. Electrolyte shared chamber; 5. Gas shared chamber; 6. Support member; 7. Heat transfer tube. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary persons in the field without creative work should fall within the scope of protection of the utility model.

[0040] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0041] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "top, bottom" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second, etc." are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] The utility model discloses a busbar for realizing the electrical connection of at least two single cells in the same battery pack. The electrical connection here can be in parallel or in series. The utility model mainly takes the parallel connection as an example for explanation. The single cell here usually refers to a square shell battery.

[0043] The main structure of the busbar is plate-shaped, which is relatively simple and easy to process. Multiple electrical connection areas and multiple fuse areas are arranged on the plate-shaped busbar body. The electrical connection areas and the fuse areas are arranged alternately one by one, and two adjacent electrical connection areas are connected by one fuse area. The electrical connection areas correspond to the single cells one by one, and are used to connect to the polarity terminals on the same side of the corresponding single cells in the battery pack.

[0044] Through structural design, the flow area of ​​the fuse zone is made smaller than the flow area of ​​the electrical connection zone. When any single cell is short-circuited, the fuse zone connected to its electrical connection zone will quickly melt under the high temperature generated by the large current, thereby disconnecting the single cell, avoiding the normal use of other single cells affected by the short circuit, protecting the entire battery pack, and improving the safety of the battery pack. There is no need to repair or replace the entire battery pack due to damage to individual single cells, thus saving repair costs.

[0045] The utility model also discloses a battery pack with the bus bar, comprising a battery pack main body and the bus bar.

[0046] The battery pack body may be any battery pack disclosed in the prior art:

[0047] Such a battery pack comprises at least two single cells;

[0048] In this embodiment, each electrical connection area of ​​the busbar is connected to the polarity terminals of the corresponding single cells in the battery module located on the same side.

[0049] The battery pack body may also be a battery pack having the following structure:

[0050] The battery pack includes a shell and a plurality of single cells; the plurality of single cells are arranged in the same direction and placed in the shell, and the inner cavity of the shell is connected with the inner cavities of all the single cells.

[0051] A rectangular shell is usually used. For ease of description, the length direction of the shell is defined as the x direction, the width direction of the shell is defined as the y direction, and the height direction of the shell is defined as the z direction.

[0052] The utility model does not specifically limit the shell structure, and at least the following two structures can be adopted:

[0053] The first structure includes a cylinder with open ends at both ends (i.e., the end parallel to the yz plane is the open end) and end plates respectively fixed to the two open ends of the cylinder (i.e., the end plates are parallel to the yz plane);

[0054] The second structure includes a cylinder with open ends at the top and bottom (i.e., the ports parallel to the xy plane are open ends) and an upper cover plate and a lower cover plate respectively fixed to the open ends at the top and bottom of the cylinder (i.e., the upper cover plate and the lower cover plate are parallel to the xy plane);

[0055] In the following description, the plates in the housing parallel to the xy plane are defined as the housing top plate and the housing bottom plate, respectively.

[0056] Preferably, a shared chamber may be provided in the outer shell so that the inner cavity of the shared chamber is connected to the inner cavities of all the single cells to achieve the above-mentioned connection effect.

[0057] It should be noted that:

[0058] The above-mentioned shared chamber can be an electrolyte shared chamber, through which each single cell can be placed in a unified electrolyte environment, ensuring the uniformity of the electrolyte in each single cell; improving the performance and charge-discharge cycle life of the battery pack. The electrolyte shared chamber described here is a liquid channel extending along the length direction of the shell between the shell bottom plate and each single cell, and the liquid channel can be integrally formed with the shell bottom plate, or formed by arranging a support between the lower cover plate of the single cell and the shell bottom plate.

[0059] The above-mentioned shared chamber may also be a gas shared chamber, through which the gas balance of each single battery is achieved, and the performance and charge-discharge cycle life of the battery pack can also be improved.

[0060] The above-mentioned shared chamber can also be a gas-liquid shared chamber. Through a gas-liquid shared chamber, each single battery can be placed in a unified electrolyte environment and gas environment, thereby improving the performance and charge-discharge cycle life of the battery pack.

[0061] In order to improve the heat dissipation performance of this type of battery pack, avoidance holes are opened on the top plate of the outer shell corresponding to the polarity terminals of each single cell; each single cell polarity terminal extends out of the corresponding avoidance hole as a battery pack polarity terminal (all single cell polarity terminals located on one side serve as the first polarity terminals of the battery pack, and all single cell polarity terminals located on the other side serve as the second polarity terminals of the battery pack, wherein the polarities of the first polarity terminal and the second polarity terminal are opposite), and the area of ​​the top plate of the outer shell corresponding to the avoidance hole is fixedly sealed with the single cell shell, so that the avoidance hole area of ​​the top plate of the outer shell is sealed.

[0062] It should be noted that the single cell polarity terminal described here can be a single cell pole. In order to avoid the single cell pole being unable to smoothly extend out of the avoidance hole as a polarity terminal or the height of the extended avoidance hole does not meet the set requirements, a pole adapter can also be connected to the single cell pole, and the overall structure of the single cell pole and the pole adapter can be used as the single cell polarity terminal.

[0063] The utility model connects n electrical connection areas of the busbar and the first end faces of the polarity terminals of the corresponding single cells of the battery pack located on the same side and extending out of the avoidance holes.

[0064] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0065] Example 1

[0066] like Figure 1 , which is a schematic diagram of the structure of the busbar 1 of this embodiment; it can be seen from the figure that the main body of the busbar 1 of this embodiment is a slender plate-shaped structure; it can usually be made of copper or aluminum. In order to ensure that the fuse area 12 is easier to fuse when the corresponding single battery 3 is short-circuited, this embodiment selects aluminum with a lower melting point or other fusible alloys with a lower melting point to make the main body of the busbar 1.

[0067] In this embodiment, 13 electrical connection areas 11 and 12 fuse areas 12 are provided on the main body of the busbar 1 along its axial direction; in other embodiments, the number of electrical connection areas 11 and fuse areas 12 can be adjusted according to the number of single cells 3 in the corresponding battery pack.

[0068] like Figure 2 As shown, in this embodiment, the electrical connection areas 11 and the fuse areas 12 are arranged alternately one by one, and a fuse area 12 is provided between two electrical connection areas 11 .

[0069] Each electrical connection area 11 is provided with at least one screw hole 111 for fixedly connecting with the polarity terminal 31 of the single battery 3. Compared with other welding, riveting or clamping methods, the screw connection method is easier to connect and has a simpler structure.

[0070] In order to ensure good contact between the busbar 1 and the polarity terminal 31 of the single cell 3, this embodiment opens four screw holes 111 on each electrical connection area 11. When the electrical connection area 11 is a rectangular area, the four screw holes 111 are preferably located at the four diagonal positions of the rectangular area. Based on the four screws, each electrical connection area 11 can be tightly fitted with the first end face of the corresponding polarity terminal 31 of the single cell 3, avoiding poor contact during use and ensuring that the busbar 1 can be used normally. More preferably, the screw holes 111 in this embodiment can be set as long holes. The setting of the long holes can make up for the size error of the polarity terminal 31 of the single cell 3 and ensure the reliability of the connection.

[0071] In this embodiment, a through hole 121 is provided in the main body area of ​​the plate-shaped busbar 1 between two adjacent electrical connection areas 11 to form a fuse area 12. Preferably, the through hole 121 is located at the geometric center of the fuse area 12; in this embodiment, the shape of the through hole 121 is not specifically limited, and can be a circular hole, a square hole, or other polygonal holes.

[0072] In this embodiment, a through hole 121 is opened in the main area of ​​the plate-like busbar 1 between two adjacent electrical connection areas 11, so that the flow area of ​​this area is smaller than the flow area of ​​the two electrical connection areas 11 connected to it. When any single battery 3 is short-circuited, this area is easy to melt rapidly from the plate-like busbar 1 area around the through hole 121 (the plate-like busbar 1 area around the through hole 121 is the fuse area 12) at high temperature, so that the two adjacent electrical connection areas 11 are disconnected, thereby avoiding the normal use of the entire battery pack being affected by the short circuit of an individual single battery 3.

[0073] It should be noted that, in order to ensure the normal operation of the battery pack, the minimum flow area of ​​the fuse zone 12 is not less than the flow area required for standard charging and discharging of the battery, so as to ensure normal charging and discharging of the battery.

[0074] like Figures 3 to 5 , which is a schematic diagram of the structure of the battery pack of this embodiment; it can be seen that the battery pack of this embodiment includes a housing 2 and single cells 3 arranged in the housing 2.

[0075] The single cells 3 in this embodiment are square shell batteries, and the number is 13. In other embodiments, the number of single cells 3 can be adjusted according to actual needs, and the shape of the single cells 3 can also be adjusted according to actual needs.

[0076] The inner cavity of each single cell 3 includes an electrolyte region and a gas region.

[0077] On the bottom plate 21 of the housing, there is provided an electrolyte sharing chamber 4 extending along the x direction (see Figure 5 ), the inner cavity of the electrolyte sharing chamber 4 is connected to the inner cavity electrolyte area of ​​each single battery 3.

[0078] It should be noted that:

[0079] The electrolyte sharing chamber 4 described here is a liquid channel extending along the length direction (x direction) of the shell 2 and located between the shell bottom plate 21 and each single cell 3. The liquid channel can be integrally formed with the shell bottom plate 21, or formed by setting a support member 6 between the lower cover plate of the single cell 3 and the shell bottom plate 21.

[0080] On the top plate 22 of the housing, a gas sharing chamber 5 extending along the x direction is provided (see Figure 5 ), the inner cavity of the gas sharing chamber 5 is connected to the inner cavity gas area of ​​each single battery 3.

[0081] In some other embodiments, only the electrolyte sharing chamber 4 or the gas sharing chamber 5 may be provided.

[0082] In order to improve the heat dissipation performance of such battery packs, a evacuation hole can be opened on the outer shell top plate 22 to allow the polarity terminals 31 of each single battery 3 to extend out; the polarity terminals 31 of each single battery 3 extend out of the evacuation hole and the outer shell top plate 22 area around the evacuation hole is fixedly sealed with the shell of the single battery 3. Figures 3 to 5 It can be seen from the figure that the polarity terminal 31 of the single cell 3 in this embodiment is the pole of the single cell 3.

[0083] In this embodiment, four screws are used to connect the 13 electrical connection areas 11 of the busbar 1 and the first end faces 311 of the polarity terminals 31 of the corresponding single cells 3 located on the same side. The projection of the fuse area 12 between two adjacent electrical connection areas 11 on the top plate 22 of the outer shell is located between the polarity terminals 31 on the same side of the two single cells 3.

[0084] When any single battery 3 is short-circuited, the fuse area 12 connected to its electrical connection area 11 will quickly fuse under the high temperature generated by the large current, thereby disconnecting the single battery 3 to avoid affecting the normal use of other single batteries 3 due to the short circuit.

[0085] Example 2

[0086] In order to further improve the heat dissipation performance of the battery pack in Example 1, Figure 6 As shown, this embodiment is based on the embodiment 1, and a heat transfer tube 7 is added. In order to clearly show the heat transfer tube 7, Figure 6 The busbar 1 is not shown;

[0087] In this embodiment, a heat transfer tube 7 clamping portion is provided at the portion where the polarity terminal 31 extends out of the avoidance hole, and the heat transfer tube 7 is fixed in the heat transfer tube 7 clamping portion, so that the heat transfer tube 7 is directly connected to the polarity terminal 31 of the battery pack, and the heat on the polarity terminal 31 where the heat is relatively concentrated can be timely discharged, thereby improving the heat dissipation effect of the battery pack. In addition, when the temperature of the battery pack is lower than the set threshold, a heat transfer medium with a higher temperature is introduced into the heat transfer tube 7 to heat up the battery pack; by controlling the temperature of the heat transfer medium, it can be ensured that the battery pack always operates at a normal operating temperature.

[0088] Combination Figure 7 It can be seen that in this embodiment, a through groove 32 is provided at the position where the polarity terminal 31 of the single battery 3 extends out of the avoidance hole, which serves as a clamping portion for the heat transfer tube 7; Figure 7 It can be seen that the polarity terminal 31 of the single cell 3 in this embodiment (the polarity terminal here refers to the single cell pole) is a cylinder, including a first end face 311, a second end face and a side wall 312 (the second end face and the first end face 311 are parallel to each other), and the through groove 32 is opened on the side wall 312 of the polarity terminal 31, that is, the opening of the through groove 32 is located on the side wall 312.

[0089] In some other embodiments, a through hole 121 may be further provided on the side wall 312 , that is, the opening of the through hole 121 is located on the side wall 312 .

[0090] In some other embodiments, a through slot 32 may be further provided on the first end surface 311 , that is, the opening of the through slot 32 is located on the first end surface 311 .

[0091] The first end surface 311 is used as the electrical connection part of the polarity terminal 31 to connect with the electrical connection area 11 of the busbar 1 to achieve electrical connection between the individual cells 3; the second end surface is used to electrically connect with the electrode assembly in the shell of the single cell 3.

[0092] In this embodiment, the through groove 32 is provided on the side wall 312. Compared with the through groove 32 provided on the first end surface 311, the contact area between the heat transfer tube 7 in the through groove 32 or through hole 121 and the inner wall of the through groove 32 or through hole 121 is larger, and the heat exchange efficiency is higher. In addition, when the through groove 32 is located on the side wall 312, the entire area of ​​the first end surface 311 can be used as the electrical connection area 11. Two through grooves 32 or through holes 121 can also be provided on the side wall 312 of the polarity terminal 31 at the same time to increase the number of heat transfer tubes 7 placed and further improve the heat exchange efficiency.

[0093] Example 3

[0094] like Figure 8 and Fig. 9 , which is a schematic diagram of the structure of the busbar 1 of this embodiment. Different from the above embodiment, this embodiment has a fuse area 12 with a different structure. The rest of the structure is the same as that of the above embodiment and will not be described in detail in this embodiment.

[0095] In this embodiment, a notch 122 is provided in the main body area of ​​the plate-shaped busbar 1 between two adjacent electrical connection areas 11 to form a fuse area 12. Preferably, two notches 122 are provided, and the two notches 122 are symmetrical with respect to the central axis of the main body of the plate-shaped busbar 1. In this embodiment, the shape of the notch 122 is not specifically limited, and it can be a semicircular notch 122, a rectangular notch 122, or other polygonal notches 122.

[0096] In this embodiment, a notch 122 is provided in the main area of ​​the plate-shaped busbar 1 between two adjacent electrical connection areas 11, so that the flow area of ​​this area is smaller than the flow area of ​​the two electrical connection areas 11 connected to it. When any single battery 3 is short-circuited, this area is easy to melt rapidly from the area of ​​the plate-shaped busbar 1 between the two notches 122 (the area of ​​the plate-shaped busbar 1 between the two notches 122 is the fuse area 12) at high temperature, so that the two adjacent electrical connection areas 11 are disconnected, thereby avoiding the normal use of the entire battery pack being affected by the short circuit of an individual single battery 3.

[0097] The busbar 1 of this embodiment can be applied to any battery pack in the above embodiments.

[0098] like Fig.10 and Fig.11 As shown, this embodiment also provides a schematic diagram of the structure of another battery pack. Different from the battery pack in the above embodiment, the polarity terminal 31 of the single cell 3 in this embodiment is an integral structure of the single cell 3 pole and the pole adapter 33. The through slot 32 is located on the first end surface 311 of the polarity terminal 31. In order to clearly show the pole adapter 33 and the through slot 32, Fig.11 In the embodiment, the heat transfer tube 7 and the bus bar 1 are fixed only on one side of the pole adapter 33 .

[0099] In addition, in this embodiment, fixing the bus 1 on the first end surface 311 of the polarity terminal 31 can also play the role of pressing the heat transfer tube 7. Based on the slight deformation of the bus 1, the heat transfer tube 7 can be tightly pressed into the through groove 32 of the polarity terminal 31, so that the heat transfer tube 7 can be closely contacted with the through groove 32 of the polarity terminal 31, and there is almost no heat conduction gap between the two, thereby increasing the heat exchange effect between the heat transfer tube 7 and the polarity terminal 31.

Claims

1. A busbar for realizing the electrical connection of n single cells in the same battery pack, wherein n is an integer greater than 1; characterized in that: It comprises a plate-shaped busbar body; the plate-shaped busbar body is provided with n electrical connection areas and n-1 fuse areas along its axial direction; The electrical connection areas and the fuse areas are arranged alternately one by one, and two adjacent electrical connection areas are connected by a fuse area; The n electrical connection areas correspond to the n single cells one by one, and each electrical connection area is used to connect to the polarity terminal located on the same side of the corresponding single cell in the battery pack; The flow area of ​​the fuse zone is smaller than the flow area of ​​the electrical connection zone.

2. The busbar according to claim 1, characterized in that: A through hole is provided in the main body area of ​​the plate-shaped busbar between two adjacent electrical connection areas to form a fuse area.

3. The busbar according to claim 2, characterized in that: The through hole is located at the geometric center of the fuse area.

4. The busbar according to claim 1, characterized in that: A notch is provided in the main body area of ​​the plate-shaped busbar between two adjacent electrical connection areas to form a fuse area.

5. The busbar according to claim 4, characterized in that: There are two notches, and the two notches are symmetrical with respect to the central axis of the plate-shaped busbar body.

6. The busbar according to claim 1, characterized in that: Each electrical connection area is provided with at least one screw hole for fixed connection with a polarity terminal.

7. A battery pack, characterized in that: Comprising n single cells and the busbar according to any one of claims 1 to 6; The n electrical connection areas of the busbar are connected to polarity terminals of the corresponding single cells located on the same side.

8. The battery pack according to claim 7, characterized in that: It also includes a housing; n single batteries are placed side by side in the housing; The inner cavity of the shell is connected with the inner cavities of all the single cells; The outer shell top plate is provided with avoidance holes corresponding to the polarity terminals of each single battery; each single battery polarity terminal extends out of the corresponding avoidance hole, and the outer shell top plate area corresponding to the avoidance hole is fixedly sealed with the single battery shell; The n electrical connection areas of the busbar are connected to the second end surfaces of the polarity terminals of the corresponding single cells located on the same side and extending out of the avoidance holes.

9. The battery pack according to claim 8, characterized in that: It also includes a heat transfer tube; a heat transfer tube clamping portion is provided at the position where the polarity terminal of the single battery extends out of the avoidance hole; and the heat transfer tube is fixed in the heat transfer tube clamping portion.

10. The battery pack according to claim 9, characterized in that: The heat transfer tube clamping part is a through hole or a through groove provided on the portion where the polarity terminal of the single battery extends out of the avoidance hole.

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