CN218300174U

CN218300174U - Battery pack

Info

Publication number: CN218300174U
Application number: CN202222854202.5U
Authority: CN
Inventors: 郑娅敏; 郭立立; 黄子崇; 齐紫玉; 廖思航; 董红伟
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2022-10-28
Filing date: 2022-10-28
Publication date: 2023-01-13
Anticipated expiration: 2032-10-28

Abstract

The utility model relates to the technical field of batteries, in particular to battery pack, including box and battery pack, battery pack sets up in the box, and battery pack includes information acquisition subassembly and group battery, and the group battery includes a plurality of battery cells that distribute along the first direction. The single battery comprises a negative terminal, a positive terminal and a shell, wherein the positive terminal and the negative terminal are both positioned on the side face of the shell, and in any two adjacent single batteries, the positive terminal of one single battery is connected to the negative terminal of the other single battery, so that the serial connection of the single batteries is realized. The information acquisition assembly comprises a transmission part and a plurality of detection parts, wherein the transmission part is positioned on the side surface of each single battery, and the detection parts are electrically connected with the transmission part. The detection part is connected to at least one of the positive terminal and the negative terminal of the adjacent single batteries which are connected with each other, so that the information acquisition assembly is connected with the single batteries, and the voltage acquisition precision is higher.

Description

Battery pack

Technical Field

The application relates to the technical field of batteries, in particular to a battery pack.

Background

The electric automobile is more and more widely applied, and the collection of the voltage of the single battery is a common technical means of the battery management system of the electric automobile. At present, a plurality of single batteries are generally included in a battery pack, and the single batteries are connected in series and in parallel through a bus bar. In the related art, the voltage collecting point is arranged on the bus bar, but because the bus bar has a certain resistance value, the voltage of the collecting point has a difference value with the real voltage of the battery, so that the voltage collecting precision is low.

SUMMERY OF THE UTILITY MODEL

The present application is directed to solving at least one of the problems in the prior art. Therefore, the battery pack is provided, and the information acquisition assembly in the battery pack is directly connected with the positive terminal or the negative terminal of the single battery, so that the voltage acquisition precision is improved.

The battery pack according to an embodiment of the present application includes:

the box body is provided with a plurality of box bodies,

the battery pack comprises a plurality of single batteries distributed along a first direction, each single battery comprises a negative terminal, a positive terminal and a shell, the positive terminal and the negative terminal are both positioned on the side surface of the shell, any two adjacent single batteries are arranged, and the positive terminal of one single battery is connected with the negative terminal of the other single battery;

the information acquisition assembly comprises a transmission part and a plurality of detection parts, wherein the detection parts are electrically connected with the transmission part, and the detection parts are connected with at least one of the positive terminal and the negative terminal which are connected with each other and adjacent to the single battery.

According to the battery pack of the embodiment of the application, at least the following beneficial effects are achieved:

in any two adjacent single batteries, the positive terminal of one single battery is connected with the negative terminal of the other single battery, and the detection part of the information acquisition assembly is connected with the positive terminal or the negative terminal of the single battery. Therefore, connect the information acquisition subassembly on the busbar among the traditional art, the detection portion of information acquisition subassembly and the anodal terminal of battery cell or negative terminal lug connection in this embodiment, voltage acquisition precision is higher.

According to some embodiments of the present application, the detection portion is sandwiched between the positive and negative terminals of the two unit batteries that are connected to each other.

According to some embodiments of the present application, one of the positive terminal and the negative terminal of the unit cell has a mating part, and the other has a mating groove;

the positive terminal and the negative terminal of the adjacent single battery are connected with the inserting groove through the inserting part, the inserting part is inserted into the inserting groove, the detection part is further provided with a connecting hole, and the detection part is sleeved on the inserting part through the connecting hole.

According to some embodiments of the present application, the housing has a regular hexagonal prism shape, and the battery pack has a plurality of the battery modules distributed along a second direction, which is perpendicular to the first direction, so that the unit cells are distributed in a honeycomb shape.

According to some embodiments of the present application, the transfer portion is located at a side of each of the unit cells;

the transmission part is arranged in a bending mode and penetrates through gaps between the adjacent single batteries of the battery pack;

or, the information acquisition subassembly still includes the extension, the one end of extension is connected transmission portion, and the other end is connected detection portion, the transmission position is located the side of group battery, the extension stretches into the group battery adjacent battery's clearance, just detection portion is located the group battery adjacent battery's clearance.

According to some embodiments of the application, the battery package still includes the liquid cooling board, the liquid cooling board set up in the box, the top and/or the bottom of group battery are provided with the liquid cooling board.

According to some embodiments of the application, the liquid cooling board is buckled and is set up, and is adjacent all be provided with between the battery pack the liquid cooling board, the liquid cooling board laminating in battery pack's side.

According to some embodiments of the application, along the second direction, the surfaces of the battery assembly at the head end and the battery assembly at the tail end facing away from each other are further provided with the liquid cooling plate.

According to some embodiments of the application, the transmission portion is connected to a side portion of the liquid-cooled panel.

According to some embodiments of the present application, the transmission portion has a heat conduction hole formed therein, the heat conduction hole extending therethrough, and a surface of the liquid-cooled plate is capable of being exposed from the heat conduction hole.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The present application is further described with reference to the following figures and examples, in which:

fig. 1 is a schematic view of a battery pack according to an embodiment of the present application;

FIG. 2 is a schematic view of the battery assembly of FIG. 1;

FIG. 3 is an enlarged view of area A of FIG. 2;

FIG. 4 is a schematic diagram of a battery pack according to an embodiment of the present application with an extension portion of a signal acquisition assembly;

FIG. 5 is an enlarged view of the area B in FIG. 4;

FIG. 6 is a schematic view of the cell of FIG. 1;

FIG. 7 is a schematic view of the battery pack of FIG. 1 further including a liquid cooling plate between adjacent battery modules;

FIG. 8 is an enlarged view of area C of FIG. 7;

FIG. 9 is a schematic view of the battery pack of FIG. 4 further having a liquid cooling plate between adjacent battery modules;

FIG. 10 is an enlarged view of area D of FIG. 9;

fig. 11 is a schematic view of the battery pack of fig. 7 further having liquid cooling plates on both sides in the second direction;

fig. 12 is a schematic view of the battery pack of fig. 9 further having liquid cooling plates at both sides in the second direction.

Reference numerals:

the battery pack 100, the single battery 110, the housing 111, the positive terminal 112, the inserting part 1121, the negative terminal 113, the inserting groove 1131, the information collecting assembly 120, the transmission part 121, the detection part 122 and the extension part 123;

the plate 200 is liquid cooled.

Detailed Description

Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the positional descriptions, such as the directions of up, down, front, rear, left, right, etc., referred to herein are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present application.

In the description of the present application, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present number, and the above, below, within, etc. are understood as including the present number. If there is a description of first and second for the purpose of distinguishing technical features only, this is not to be understood as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.

In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.

In the description of the present application, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The electric automobile is more and more widely applied, and the collection of the voltage of the single battery is a common technical means of the battery management system of the electric automobile. At present, a plurality of single batteries are generally included in a battery pack, and the single batteries are connected in series and in parallel through a bus bar. In the related art, the voltage collecting point is disposed on the bus bar, but since the bus bar has a certain resistance value, a difference exists between the voltage of the collecting point and the actual voltage of the battery, and thus the voltage collecting accuracy is low.

Based on the above problems, the present application provides a battery pack, where fig. 1 is a schematic diagram of a battery pack according to an embodiment of the present application, fig. 2 is a schematic diagram of a battery assembly in fig. 1, fig. 3 is an enlarged schematic diagram of a region a in fig. 2, fig. 4 is a schematic diagram of a battery pack according to an embodiment of the present application where a signal acquisition assembly has an extension portion, fig. 5 is an enlarged schematic diagram of a region B in fig. 4, and referring to fig. 1 to 5, the battery pack according to the present embodiment includes a case and a battery assembly 100.

Wherein, the box has the installation cavity. The battery assembly 100 is disposed in the installation cavity, and the battery assembly 100 includes an information collecting assembly 120 and a battery pack, and the battery pack includes a plurality of unit batteries 110 (as shown in fig. 2) distributed along a first direction. The single battery 110 includes a case 111, a positive terminal 112 and a negative terminal 113, the positive terminal 112 and the negative terminal 113 are both located on a side surface of the case 111, and in any two adjacent single batteries 110, the positive terminal 112 of one single battery 110 is connected to the negative terminal 113 of the other single battery 110, so as to realize series connection of the single batteries 110. The information collecting assembly 120 includes a transmission part 121 and a plurality of detection parts 122, the transmission part 121 is located on a side surface, a bottom surface or a top surface of each battery cell 110, and the detection parts 122 are electrically connected to the transmission part 121. The detection part 122 is connected to at least one of the positive electrode terminal 112 and the negative electrode terminal 113 of the adjacent unit cells 110, which are connected to each other. The information collecting assembly 120 is bent, that is, the transmission part 121 is S-shaped and penetrates through the gaps of the adjacent single batteries 110, the detection parts 122 at the two sides are respectively connected with the terminals of the two single batteries 110 (as shown in fig. 2 and 3), or the information collecting assembly 120 further comprises an extension part 123, one end of the extension part 123 is connected with the transmission part 121, the other end of the extension part 123 is connected with the detection part 122, the transmission part 121 is connected with the side surface of the battery pack, and the extension part 123 can extend into the gaps between the adjacent single batteries 110 of the battery pack (as shown in fig. 4 and 5), so that the information collecting assembly 120 is connected with the single batteries 110. Therefore, compared with the conventional technology in which the information collection assembly is connected to the bus bar, the detection portion 122 of the information collection assembly 120 in the present embodiment is directly connected to the positive electrode terminal 112 or the negative electrode terminal 113 of each unit cell 110, so that the voltage collection accuracy is higher.

Referring to fig. 3, in some embodiments, the detecting portion 122 is sandwiched between the positive terminal 112 and the negative terminal 113 of the two single batteries 110, that is, one surface of the detecting portion 122 along the thickness direction abuts against the positive terminal 112 of the first single battery 110, and the other surface abuts against the negative terminal 113 of the second single battery 110, so that the detecting portion 122 is sandwiched between the negative terminal 113 and the positive terminal 112 to complete the connection between the detecting portion 122 and the single battery 110, which is simpler in process. And since the detection part 122 has conductivity, the negative terminal 113 and the positive terminal 112 can be electrically connected, so that the cells 110 can be connected in series without additionally providing a bus bar or a wire harness for electrical connection. Welding may also be performed between the detection part 122 and the negative and

positive terminals

113 and 112 to improve the reliability of the connection between the detection part 122 and the negative and

positive terminals

113 and 112.

Referring to fig. 3 and 6, fig. 6 is a schematic diagram of the single cell in fig. 1, based on the above embodiment, one of the positive terminal 112 and the negative terminal 113 of the single cell 110 has the insertion part 1121, and the other has the insertion groove 1131, and in two adjacent single cells 110, for example, the positive terminal 112 of the single cell 110 has the insertion part 1121, the insertion part 1121 is located at one end of the positive terminal 112 facing away from the housing 111, the negative terminal 113 has the insertion groove 1131, and the insertion groove 1131 is located at one end of the negative terminal 113 facing away from the housing 111. The insertion part 1121 of the positive terminal 112 of the first unit cell 110 can be inserted into the insertion groove 1131 of the negative terminal 113 of the second unit cell 110, so that the positive terminal 112 and the negative terminal 113 of two adjacent unit cells 110 are connected through the insertion part 1121 and the insertion groove 1131, the detection part 122 further has a connection hole, and the detection part 122 is sleeved on the insertion part 1121 through the connection hole to improve the connection strength between the detection part 122 and the unit cell 110, so as to improve the reliability of the electrical connection between the unit cells 110 of the detection part 122.

In addition, the positive terminal 112 and the negative terminal 113 of the adjacent battery are connected through the plugging portion and the plugging groove 1131, and the contact area of the positive terminal 112 and the negative terminal 113 can be increased, so as to reduce the contact resistance value between the positive terminal 112 and the negative terminal 113.

Referring to fig. 1, in some embodiments, the housing 111 has a regular hexagonal prism shape, the plurality of battery assemblies 100 are distributed in the battery pack along a second direction (the second direction is perpendicular to the first direction), and the plurality of unit batteries 110 of the plurality of battery assemblies 100 are distributed in a honeycomb shape. Since the interior of the case 111 of the regular hexagonal prism has a large remaining space, more electrolyte can be accommodated to extend the service life of the battery. In addition, because the regular hexagon has the shape characteristic that the plane is densely paved, when connecting multiunit group battery, regular hexagonal prism's casing 111 can reduce the interval between the adjacent battery cell 110 for can set up more quantity of battery in the unit area, effectively improve outside space utilization, and make the battery package structurally more stable, difficult emergence is rocked.

Referring to fig. 1 and 4, in some embodiments, the transmission part 121 is located at a side surface of each unit cell 110, two opposite surfaces of the transmission part 121 in the thickness direction are provided with the detection parts 122, and the two detection parts 122 are connected by a via hole provided on the transmission part 121. The transmission portion 121 is bent, and the transmission portion 121 is inserted into the gap between adjacent batteries in an S-shape (as shown in fig. 1), that is, a portion of the transmission portion 121 is located between adjacent single batteries 110 of the battery pack, the detection portions 122 at two sides are respectively connected with the positive terminal 112 and the negative terminal 113 of the two single batteries 110, and the transmission portion 121 is clamped between the two adjacent single batteries 110. Therefore, in the assembling process, the fixing process of the transmission part 121 can be reduced, so that the assembling process is simpler, and the assembling efficiency is improved.

Alternatively, the information collecting assembly 120 further includes an extension portion 123, one end of the extension portion 123 is connected to the transmission portion 121, the other end of the extension portion 123 is connected to the detection portion 122, the transmission portion 121 is connected to the side surface of the battery pack, and the extension portion 123 can extend into between adjacent single batteries 110 of the battery pack (as shown in fig. 4), so that the detection portion 122 is located between the adjacent single batteries 110 and connected to the positive terminal 112 and the negative terminal 113 that are connected to each other. The extension portion 123 may be cut from a portion of the transmission portion 121 to reduce the material consumption of the information collecting assembly 120, thereby saving the manufacturing cost.

On the basis of the above embodiment, the battery pack further comprises the liquid cooling plate 200, and the liquid cooling plate 200 is arranged in the installation cavity and used for reducing the temperature of the single battery 110, preventing the temperature from being too high in the working process, improving the safety of the battery pack, and improving the charging and discharging efficiency of the battery pack under the condition that the battery pack is at a proper working temperature. The liquid cooling plate 200 may be disposed at the top or bottom of the battery pack to cool the unit cells 110. Alternatively, the liquid cooling plates 200 are disposed at the bottom and the top of the battery pack, so as to improve the heat dissipation performance of the unit cells 110.

Referring to fig. 7 to 10, fig. 7 is a schematic view illustrating that a liquid cooling plate is further provided between adjacent battery assemblies of the battery pack in fig. 1, fig. 8 is an enlarged schematic view of a region C in fig. 7, fig. 9 is a schematic view illustrating that a liquid cooling plate is further provided between adjacent battery assemblies of the battery pack in fig. 4, and fig. 10 is an enlarged schematic view of a region D in fig. 9, in some embodiments, the battery pack further includes a liquid cooling plate 200, the liquid cooling plate 200 is bent to fit the profile of the side surface of the battery assembly 100, and the liquid cooling plate 200 is provided between adjacent battery assemblies 100, and the liquid cooling plate 200 is bent to be provided between adjacent battery assemblies and attached to the side surface of the battery assembly 100 to increase the contact area between the liquid cooling plate 200 and the single battery 110, thereby increasing the heat dissipation efficiency of the single battery 110.

In addition, it can be understood that, during the operation of the battery pack, the temperature of the single battery 110 in the central region is higher, and the liquid cooling plate 200 is disposed between the adjacent battery packs in the embodiment, so that at least three sides of the single battery 110 in the central region are in direct contact with the liquid cooling plate 200 along the second direction, so as to improve the heat dissipation performance of the single battery 110 in the central region.

Referring to fig. 11 and 12, fig. 11 is a schematic diagram of the battery pack in fig. 7 having liquid cooling plates on two sides along the second direction, and fig. 12 is a schematic diagram of the battery pack in fig. 9 having liquid cooling plates on two sides along the second direction, on the basis of the above embodiment, along the second direction, the surfaces of the battery assembly 100 at the head end and the battery assembly 100 at the tail end that face away from each other are further provided with the liquid cooling plates 200, so that each single battery 110 has three side surfaces that are in direct contact with the liquid cooling plates 200, and the overall heat dissipation performance of the battery pack is improved.

Referring to fig. 7 to 10, in some embodiments, the transmission part 121 of the information collecting assembly 120 is connected to a side of the liquid cooling plate 200, and when the information collecting assembly 120 is inserted between the gaps of the adjacent unit cells 110 of the battery pack, a portion of the transmission part 121 is connected to one surface of the liquid cooling plate 200 in the thickness direction (as shown in fig. 7 and 8), so that the liquid cooling plate 200 can also cool the information collecting assembly 120, and the service life of the information collecting assembly 120 is prolonged. When the information collecting assembly 120 further includes the extension 123 and the transmission part 121 is connected to the side of the battery pack, the liquid-cooled plate 200 has the same contour as the transmission part 121 of the information collecting assembly 120 (as shown in fig. 9 and 10). Therefore, when the assembling process is performed, the information acquisition assembly 120 can be fixed on the liquid cooling plate 200 by means of adhesive glue and the like to form an integrated structure, the integrated structure of the liquid cooling plate 200 and the information acquisition assembly 120 is installed between the battery packs, and then the extension part 123 is inserted into the gap between the adjacent single batteries 110 of the battery packs to be connected with the terminal, so that the assembling process of the battery pack is simplified, and the assembling efficiency is improved.

On the basis of the above embodiment, the transmission portion 121 has a heat conduction hole, the heat conduction hole penetrates through the transmission portion 121, and the surface of the liquid cooling plate 200 can be exposed from the heat conduction hole, so that the heat of the single battery 110 can be quickly transferred to the liquid cooling plate 200 through the heat conduction hole, thereby reducing the influence of the base material of the information acquisition assembly 120 on the heat transfer between the liquid cooling plate 200 and the single battery 110, and improving the heat dissipation performance of the single battery 110.

On the basis of the above embodiment, the heat conducting potting adhesive is further filled in the heat conducting holes, so that the liquid cooling plate 200 and the single battery 110 can perform heat transfer through the heat conducting potting adhesive. The speed of transferring the heat of the unit cells 110 to the liquid cooling plate 200 is increased, thereby increasing the heat dissipation performance of the heat dissipating unit cells 110.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

Claims

1. A battery pack, comprising:

a box body;

2. The battery pack according to claim 1, wherein the detection portion is sandwiched between the positive electrode terminal and the negative electrode terminal of the two unit batteries that are connected to each other.

3. The battery pack according to claim 2, wherein one of the positive electrode terminal and the negative electrode terminal of the unit battery has a mating part, and the other has a mating groove;

the positive terminal and the negative terminal of the adjacent single battery are connected with the inserting groove through the inserting part, the inserting part is inserted in the inserting groove, the detection part is further provided with a connecting hole, and the detection part is sleeved on the inserting part through the connecting hole.

4. The battery pack of claim 1, wherein the housing has a regular hexagonal prism shape, and the battery pack has a plurality of the battery modules distributed along a second direction perpendicular to the first direction, so that the battery cells are distributed in a honeycomb shape.

5. The battery pack according to claim 4, wherein the transfer portion is located at a side of each of the unit cells;

the transmission part is arranged in a bending mode and penetrates through the gaps between the adjacent single batteries of the battery pack;

6. The battery pack of claim 5, further comprising a liquid cooling plate disposed within the box, wherein the liquid cooling plate is disposed on the top and/or bottom of the battery pack.

7. The battery pack according to claim 5, further comprising a liquid cooling plate, wherein the liquid cooling plate is bent, the liquid cooling plate is arranged between each two adjacent battery assemblies, and the liquid cooling plate is attached to the side surface of each battery assembly.

8. The battery pack according to claim 7, wherein, in the second direction, surfaces of the battery assembly at the head end and the battery assembly at the tail end that face away from each other are further provided with the liquid-cooled plate.

9. The battery pack according to claim 7 or 8, wherein the transmission part is connected to a side of the liquid-cooled plate.

10. The battery pack according to claim 9, wherein the transmission portion has a heat conduction hole formed therein, the heat conduction hole penetrating through the transmission portion, and a surface of the liquid-cooled plate is exposed from the heat conduction hole.