WO2022088392A1

WO2022088392A1 - Holding plate, battery module, and battery pack

Info

Publication number: WO2022088392A1
Application number: PCT/CN2020/134239
Authority: WO
Inventors: 刘祖勇; 韦银涛; 蒙玉宝; 祝媛; 刘金成
Original assignee: 湖北亿纬动力有限公司
Priority date: 2020-10-26
Filing date: 2020-12-07
Publication date: 2022-05-05
Also published as: CN112117413A

Abstract

A holding plate, a battery module, and a battery pack. The holding plate is held between two adjacent battery cells (2) of the battery module, and comprises multiple main components (11) and a stopper (12). The multiple main components are spaced apart from each other. Each main component is provided with airflow channels (111), and two opposite sides of each main component respectively abut the two adjacent battery cells. The stopper is connected to two ends of each of the multiple main components. The stopper can abut two ends of each battery cell in the length direction of the battery cell, and can abut two ends of each battery cell in the height direction of the battery cell.

Description

Plywood, battery modules and battery packs

This application claims the priority of the Chinese patent application with an application date of October 26, 2020 and an application number of 202011157260.1, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the technical field of energy equipment, such as a splint, a battery module and a battery pack.

Background technique

After a long-term charge-discharge cycle of the battery module, the internal expansion of the cells will reduce its cycle life. Therefore, after the cells are stacked into a group, a pre-tightening force will be applied to the cells through the end plates at both ends to suppress the expansion of the cells. In some cases of high-rate charge and discharge, the cell generates a large amount of heat, and the cell needs to be cooled by air to dissipate heat, or under low temperature conditions, the cell needs to be heated by warm air. Therefore, it is necessary to design gaps between the cells, which are used as air ducts to dissipate heat or heat the cells, so that the temperature of the cells in the entire module is more uniform. Due to the addition of air ducts between the cells, the structure of only squeezing the two ends of the cells to fix the cells is used when fixing the cells, which will cause the middle of the cells to lose the extrusion force. Although it meets the requirements of cell thermal management, the extrusion effect of a single cell is reduced, and the life of the cell cannot be maximized.

SUMMARY OF THE INVENTION

The present application proposes a splint, which can not only better meet the heat dissipation requirements of the cells of the battery module, but also ensure the squeezing effect of a single cell, thereby improving the life of the cell.

The present application proposes a battery module, which can not only meet the requirements of thermal management of battery cells, but also ensure the squeezing effect of a single battery cell, thereby improving the life of the battery cells.

The present application proposes a battery pack, which has better temperature control performance and longer service life.

The embodiment of the present application discloses a splint, which is sandwiched between two adjacent cells of a battery module, the splint includes a plurality of bodies and stoppers, the bodies are arranged at intervals, and each of the bodies is arranged at intervals. The main body is provided with an air flow channel, the opposite sides of each of the main bodies are respectively abutted on the two adjacent battery cells, the stopper is connected to the two ends of the plurality of main bodies, and the The stopper can stop at both ends of the battery cell along the length direction of the battery cell, and the stopper can also stop at both ends of the battery cell along the height direction of the battery cell.

The embodiment of the present application also discloses a battery module, comprising: a plurality of battery cells, the plurality of battery cells are arranged at intervals; the above-mentioned splint, the number of the splint plates, each of the splint plates It is sandwiched between two adjacent battery cores; a binding band is arranged around the battery core, and the binding band is arranged to bind the multiple battery cores and the multiple clamping plates.

The present application also discloses a battery pack, comprising: a casing with an air inlet and an air outlet; the above-mentioned battery module, the plurality of battery modules are arranged along the The length direction of the casing is distributed at intervals; the fan is arranged at the air outlet.

Description of drawings

FIG. 1 is a schematic structural diagram of a splint of a battery module according to an embodiment of the present application.

FIG. 2 is a schematic structural diagram of a battery module according to an embodiment of the present application.

FIG. 3 is a schematic structural diagram of a battery pack according to an embodiment of the present application.

FIG. 4 is a schematic structural diagram of another direction of the battery pack according to the embodiment of the present application.

FIG. 5 is a schematic structural diagram of an elastic layer disposed on the body of the splint in the battery module according to an embodiment.

Reference number:

11. Main body; 111. Air flow channel; 112, First side wall; 113, Second side wall; 12, Stopper; 121, First blocking plate; , vertical plate; 1222, horizontal plate; 13, limit protrusion; 2, battery core; 3, strap; 4, end plate; 100, shell; 110, first air hole; 120, second air hole; 130, the third air hole; 140, the air outlet; 200, the fan; 300, the elastic layer.

Detailed ways

In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Back, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the application and simplifying the description, rather than indicating or implying the indicated device or Elements must have a particular orientation, be constructed and operate in a particular orientation and are therefore not to be construed as limitations on this application.

In addition, the features defined with "first" and "second" may explicitly or implicitly include one or more of the features, which are used to distinguish and describe the features, regardless of order or importance. In the description of this application, unless stated otherwise, "plurality" means two or more.

In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the connection between the inner plates of two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

The specific structure of the splint according to the embodiment of the present application will be described below with reference to FIG. 1 .

As shown in FIGS. 1-2 , the present application discloses a splint. The splint is sandwiched between two adjacent cells 2 . The splint includes a plurality of bodies 11 and stoppers 12 , and the plurality of bodies 11 are arranged at intervals. , each body 11 is provided with an air flow channel 111, the opposite sides of each body 11 are respectively abutted on the two battery cells 2, the stopper 12 is connected to both ends of the body 11, and the stopper 12 can stop the At both ends of the battery cell 2 along its length direction, the stopper 12 can also stop at both ends of the battery core 2 along its height direction.

In the actual assembly, since the main body 11 of the splint is provided with the airflow channel 111 , the airflow can pass through the airflow channel 111 and the battery cell no matter when the cold air is passed to cool the cell 2 or the warm air is passed to heat the cell 2 . 2 is in full contact, so that the cooling or heating of the battery cell 2 is better achieved. At the same time, since the opposite sides of the splint stop against the battery core 2, after the plurality of battery cores 2 and the plurality of splints are bound with the straps 3, each battery core 2 will be subjected to the contacting force against the battery core 2. Extrusion of the splint, thereby increasing the cycle life of the battery cell 2. In addition, the stopper 12 can abut against both ends of the cell 2 in the length direction and both ends of the cell 2 in the height direction. Therefore, the stopper 12 limits the movement of the battery cell 2 along the length direction and the height direction thereof, so as to ensure the stability of the entire battery module.

In the splint of the embodiment of the present application, since the main body 11 of the splint is provided with an air flow channel 111, the hot air or cold air can fully contact the battery cell 2 through the air flow channel 111, which better realizes cooling or heating of electricity. Since the opposite sides of the splint are respectively abutted on the two cells 2, after the multiple cells 2 and the multiple splints are bound by the straps 3, each cell 2 will receive the splint against it. extrusion, thereby increasing the cycle life of the battery cell 2. Since the stopper 12 restricts the movement of the battery cell 2 from two directions of height and length, the occurrence of loosening or wiggling of the battery cell 2 is avoided, and the stability and reliability of the battery module are improved.

In some embodiments, as shown in FIG. 2 and FIG. 5 , an elastic layer 300 is provided on the side wall of the battery core 2 against the body 11 . As a result, the elastic layer 300 can be used for tolerance compensation and can play a buffering role to prevent the battery cell 2 from being bumped, and the elastic layer 300 can also make the battery cell 2 more evenly squeezed, thereby improving the cycle of the battery cell 2. service life.

In some embodiments, as shown in FIG. 2 , the stopper 12 includes two baffle plates, the two baffle plates are respectively connected to two ends of the plurality of bodies 11 , and each baffle plate includes a connected first baffle plate 121 . and the second blocking plate 122, the first blocking plate 121 abuts against one end of the battery cell 2 along its length direction, the second blocking plate 122 abuts on one end of the battery cell 2 along its length direction and the battery cell 2 along its height on one end of the direction. Through the stop action of the first blocking plate 121 and the second blocking plate 122, the fixing effect of the splint on the cell 2 is ensured, on the one hand, the connection stability between the splint and the cell 2 after the binding strap 3 is improved, The deformation of the entire battery module caused by the movement of the battery cell 2 during transportation is avoided.

In some specific embodiments, as shown in FIG. 2 , the body 11 has a first side wall 112 and a second side wall 113 , and the first side wall 112 and the second side wall 113 stop against the two battery cells 2 respectively . The first blocking plate 121 includes a plurality of vertical portions 1211 distributed along the height direction of the battery cell 2 . Both ends of each vertical portion 1211 are connected to the two bodies 11 respectively. One vertical portion 1211 is connected to the first side wall 112 , and the other vertical portion 1211 is connected to the second side wall 113 . After the installation is completed, among the two adjacent vertical portions 1211 , one vertical portion 1211 abuts against one cell 2 , and the other vertical portion 1211 abuts against another cell 2 . Since the first blocking plates 121 are two connected to the two ends of the main body 11 , the use of the technical solution in which the vertical portions 1211 on the same first blocking plate 121 are alternately abutted against each other can improve the edge of each cell 2 to the maximum limit. The contact area between the two ends in the length direction and the two first blocking plates 121 ensures the stability of the battery cell 2 .

In some embodiments, as shown in FIG. 1 and FIG. 2 , the second blocking plate 122 includes two L-shaped plates, and the two L-shaped plates are respectively connected to the first side wall 112 and the second side wall 113 . The horizontal plate 1222 of the plate is connected to the body 11 and stops at one end of the cell 2 along its height direction, and the vertical plate 1221 of the L-shaped plate is connected to the uppermost vertical portion 1211 and stops at the cell 2. 2 on one end along its length. Since the second blocking plate 122 is an L-shaped plate, that is to say, the second blocking plate 122 is fitted at the corner of the battery cell 2 . The stability of the battery core 2 can better avoid the phenomenon of the battery core 2 shaking.

In some embodiments, the airflow channels 111 extend along the height direction of the battery cell 2 , and each body 11 is provided with a plurality of airflow channels 111 spaced along its length direction. The plurality of airflow channels 111 are spaced apart on the main body 11 , which ensures the strength of the main body 11 on the premise of ensuring the smooth flow of air flow, thereby avoiding the occurrence of damage to the main body 11 caused by the expansion of the battery cells 2 .

Example:

The splint according to a specific embodiment of the present application will be described below with reference to FIG. 1 .

As shown in FIG. 1 , the splint includes a main body 11 and a stopper 12 , the main bodies 11 are three spaced apart, and each main body 11 has a first side wall 112 and a second side wall 113 . The two side walls 113 abut against the two battery cells 2 respectively. The stopper 12 includes two baffles, each of which is connected to one end of the three bodies 11 . Each baffle includes a first blocking plate 121 and a second blocking plate 122 which are connected. The first blocking plate 121 includes two vertical portions 1211 distributed along the height direction of the cell 2 , two ends of each vertical portion 1211 are respectively connected with the two bodies 11 , and one of the vertical portions 1211 is connected to the first On the side wall 112 , another vertical portion 1211 is connected to the second side wall 113 . The vertical portions 1211 of the two first blocking plates 121 located at the same height are respectively connected to the first side wall 112 and the second side wall 113 . Exemplarily, the lower vertical portion 1211 of one first blocking plate 121 is connected to the first side wall 112 , the upper vertical portion 1211 is connected to the second side wall 113 , and the other first blocking plate 121 The vertical portion 1211 located below is connected to the second side wall 113 , and the vertical portion 1211 located above is connected to the first side wall 112 . The second blocking plate 122 includes two L-shaped plates. The two L-shaped plates are connected to the first side wall 112 and the second side wall 113 respectively. The horizontal plate 1222 of the L-shaped plate is connected to the main body 11 and stops against the On one end of the core 2 along its height direction, the vertical plate 1221 of the L-shaped plate is connected to the uppermost vertical portion 1211 and abuts on one end of the battery core 2 along its length direction.

The following describes a battery module according to a specific embodiment of the present application with reference to FIG. 2 .

As shown in FIG. 2 , the battery module of the embodiment of the present application includes a battery cell 2 , the aforementioned splint and a strap 3 . There are multiple battery cells 2 , and the multiple battery cells 2 are arranged at intervals; there are multiple splints, and each splint It is sandwiched between two adjacent cells 2 , and the straps 3 are arranged around the cells 2 , and the straps 3 are set to bind a plurality of cells 2 and a plurality of splints.

The battery module of the embodiment of the present application has the aforementioned splint, which can not only meet the requirements of thermal management of the battery cell 2 , but also ensure the squeezing effect of a single battery cell 2 , thereby improving the battery cell 2 . lifespan.

In some embodiments, as shown in FIG. 1 and FIG. 2 , the stopper 12 is provided with a limiting protrusion 13 , and the strap 3 stops against the limiting protrusion 13 . The abutment between the limiting protrusion 13 and the strap 3 can limit the stopper 12 and prevent the stopper from moving along the height direction of the cell 2, thereby avoiding vibration and uneven expansion inside the cell 2 resulting in the splint The phenomenon of sliding out the battery module occurs.

Optionally, the number and quantity of the limiting protrusions 13 can be selected according to actual needs, and the parameters of the limiting protrusions 13 are not limited here.

Example:

The following describes a battery module according to a specific embodiment of the present application with reference to FIGS. 1-2 .

As shown in FIGS. 1-2 , the battery module includes a cell 2 , a splint, a strap 3 and an end plate 4 . The number of the cells 2 is eight, and the eight cells 2 are arranged at intervals, the number of the splints is fourteen, and two adjacent cells 2 are spaced along the height direction of the cells 2. The distributed splint, the number of end plates 4 is two, the two end plates 4 are located outside the eight cells 2, the number of straps 3 is two, and the two straps 3 are along the height direction of the cells 2 Distributed at intervals, each strap 3 is set to bind the cell 2 , the splint and the end plate 4 . The structure of the splint has been described in detail above.

The specific structure of the battery pack according to the embodiment of the present application will be described below with reference to FIGS. 3 to 4 .

As shown in FIGS. 3-4 , the present application also discloses a battery pack, the battery pack includes a casing 100, a battery module and a fan 200, the casing 100 is provided with an air inlet and an air outlet 140, and the battery module The plurality of battery modules are distributed at intervals along the length direction of the casing 100 , and the fan 200 is arranged at the air outlet 140 .

In some embodiments, the air inlet includes a first air hole 110 , the first air hole 110 is arranged on the bottom wall of the housing 100 , and the position of the first air hole 110 is arranged corresponding to the airflow channel 111 . The arrangement of the first air holes 110 corresponding to the air flow channels 111 can increase the contact area between the air flow and the battery cell 2 , thereby improving the heating or cooling effect of the battery cell 2 .

Optionally, the lengths of the plurality of first air holes 110 along the length direction of the casing 100 are different, and the length of the first air holes 110 that are closer to the fan 200 is larger. In the actual heat dissipation process, the fan 200 can extract the heat in the battery module by drawing air outward. Therefore, the heat dissipation or heating effect of the battery cells 2 far away from the fan 200 is better, so that multiple battery cells 2 will appear. Local supercooling or local superheating. However, in this embodiment, the length of the first air hole 110 close to the fan 200 is relatively large, and the length of the first air hole 110 away from the fan 200 is relatively small, so that the heat dissipation or heating effect of the plurality of battery cells 2 can be better. , so as to avoid local overheating or local overcooling in the casing 100 .

In some embodiments, the air inlet further includes second air holes 120 , the second air holes 120 are arranged on two opposite side walls of the housing 100 , and each second air hole 120 corresponds to two adjacent battery molds Gap settings between groups. The second air holes 120 are arranged corresponding to the gaps between two adjacent battery modules, which can improve the uniformity of heating or heat dissipation of the plurality of battery modules by the airflow, thereby ensuring uniform temperature inside the entire battery pack and avoiding battery The phenomenon of local overheating or overcooling inside the package occurs.

In some embodiments, the air inlet further includes a third air hole 130 , the third air hole 130 and the air outlet 140 are provided on the other two opposite side walls of the casing 100 , and the third air hole 130 corresponds to each battery mold The gap between two adjacent battery cells 2 in the group is set. The third air holes 130 are arranged corresponding to the gaps between the two adjacent cells 2 , which can improve the uniformity of heating or heat dissipation of the plurality of cells 2 in the same battery module by the airflow, thereby ensuring the interior of the entire battery pack. The temperature uniformity of the battery pack can be avoided to avoid the occurrence of local overheating or overcooling inside the battery pack.

Optionally, the air inlet includes at least one of a first air hole 110 , a second air hole 120 and a third air hole 130 .

Example:

The battery pack according to the embodiment of the present application will be described below with reference to FIGS. 3-4 .

As shown in FIGS. 3-4 , the battery pack includes a casing 100, a battery module and a fan 200. The casing 100 is provided with an air inlet and an air outlet 140, and there are four battery modules. The housing 100 is distributed at intervals in the longitudinal direction, and the fan 200 is provided at the air outlet 140 . The air outlets 140 are provided on the rear side wall of the housing 100 , and there are two spaced apart, and each air outlet 140 is provided with a fan 200 . The air inlet includes a first air hole 110 , a second air hole 120 and a third air hole 130 . The first air holes 110 are disposed on the bottom wall of the casing 100 , and the first air holes 110 are distributed in seven rows and four columns, and each first air hole 110 is disposed corresponding to an airflow channel 111 of a battery module. There are six second air holes 120 , and three second air holes 120 are respectively provided on the left side wall and the right side wall of the casing 100 , and each second air hole 120 corresponds to the gap between two adjacent battery modules. set up. The third air holes 130 are arranged on the front side wall of the casing 100 , and there are seven spaced apart, and each second air hole 120 is arranged corresponding to a gap between two adjacent cells 2 .

The battery pack of the embodiment of the present application has the aforementioned battery module, which improves the temperature control performance of the battery pack and prolongs the service life of the battery pack.

In the description of this specification, description with reference to the terms "some embodiments", "other embodiments", etc. means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one implementation of the present application example or example. In this specification, schematic representations of the above terms 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.

Claims

A splint is sandwiched between two adjacent cells (2) of a battery module, the splint comprises a plurality of bodies (11) and a stopper (12), the plurality of bodies (11) They are arranged at intervals, each of the main bodies (11) is provided with an air flow channel (111), and the opposite sides of each of the main bodies (11) are respectively abutted on the two adjacent battery cells (2), The stopper (12) is connected to both ends of the plurality of bodies (11), and the stopper (12) can stop against the battery cell (2) along the battery cell (2). At both ends in the length direction, the stopper (12) can also stop against the two ends of the battery cell (2) along the height direction of the battery core (2).
The splint according to claim 1, wherein an elastic layer (300) is provided on the side wall of the battery core (2) for the body (11) to stop.
The splint according to claim 1, wherein the stopper (12) comprises two baffles, the two baffles are respectively connected to both ends of the plurality of bodies (11), each of the The baffle plate includes a first blocking plate (121) and a second blocking plate (122) which are connected, and the first blocking plate (121) stops against the battery cell (2) along the length of the battery core (2). On one end of the direction, the second blocking plate (122) stops at one end of the cell (2) along the length direction of the cell (2) and the cell (2) along the length of the cell (2) (2) on one end in the height direction.
The splint according to claim 3, wherein the body (11) has a first side wall (112) and a second side wall (113), the first side wall (112) and the second side wall (113) respectively stop against the two adjacent battery cells (2);

The first blocking plate (121) includes a plurality of vertical parts (1211) distributed along the height direction of the battery core (2), and two ends of each vertical part (1211) are respectively connected to two of the vertical parts (1211). The main bodies (11) are connected, and among the two adjacent vertical parts (1211), one of the vertical parts (1211) is connected to the first side wall (112), and the other vertical part (1211) is connected to the first side wall (112). A portion (1211) is connected to the second side wall (113).
The splint according to claim 4, wherein the second blocking plate (122) comprises two L-shaped plates, and the two L-shaped plates are respectively connected to the first side wall (112) and the first side wall (112). On the two side walls (113), the horizontal plate (1222) of the L-shaped plate is connected to the main body (11) and abuts against the cell (2) along the height direction of the cell (2). On one end of the L-shaped plate, the vertical plate (1221) of the L-shaped plate is connected to the adjacent vertical portion (1211), and abuts against the cell (2) along the edge of the cell (2). on one end of the length.
The splint according to claim 1, wherein the airflow channel (111) extends along the height direction of the battery core (2), and each of the main bodies (11) is provided with a plurality of along the main body The airflow channels (111) are distributed at intervals along the length direction of (11).
A battery module, comprising:

a battery cell (2), the plurality of battery cells (2), and the plurality of battery cells (2) are arranged at intervals;

The splint according to any one of claims 1-6, wherein the splint is plural, and each of the splints is sandwiched between two adjacent battery cores (2);

A binding tape (3), the binding tape (3) is arranged around the battery cells (2), and the binding tape (3) is arranged to bind the plurality of battery cells (2) and the plurality of splints.
The battery module according to claim 7, wherein a limiting protrusion (13) is provided on the stopper (12), and the strap (3) is stopped on the limiting protrusion (13).
A battery pack comprising:

a casing (100), the casing (100) is provided with air inlets (110, 120, 130) and an air outlet (140);

The battery module according to claim 7 or 8, wherein there are a plurality of battery modules, and the plurality of battery modules are distributed at intervals along the length direction of the casing (100);

A fan (200) is provided at the air outlet (140).
The battery pack according to claim 9, wherein the air inlets (110, 120, 130) comprise at least one of the following:

a plurality of first air holes (110), the plurality of first air holes (110) are provided on the bottom wall of the housing (100) and are provided corresponding to the air flow passages (111); or

A plurality of second air holes (120), the plurality of second air holes (120) are provided on two opposite side walls of the housing (100), each of the second air holes (120) corresponding to the gap between two adjacent battery modules; or

A plurality of third air holes (130), the plurality of third air holes (130) and the air outlet (140) are respectively provided on the other two opposite side walls of the housing (100), each The third air holes (130) are arranged corresponding to the gap between two adjacent battery cells (2) in one of the battery modules.