CN219873706U - Battery cell assembly, battery pack and electric equipment - Google Patents

Abstract

The utility model relates to the technical field of power batteries, in particular to a battery cell assembly, a battery pack and electric equipment, wherein the battery cell assembly comprises a heat dissipation plate, a heat insulation structure and a battery cell, the two heat dissipation plates are arranged at intervals along a first direction, the heat dissipation plate comprises a main body part, a first folded edge and a second folded edge are arranged on two opposite sides of the main body part along a second direction, a third folded edge is arranged on one side of the main body part along a third direction, and the first folded edge, the second folded edge and the third folded edge are all folded towards the other heat dissipation plate so as to form a containing space by being matched with the main body part in a surrounding manner; the electric core is correspondingly arranged in the accommodating space, and is in thermal contact with the main body part, the first folded edge, the second folded edge and the third folded edge; the heat insulation structure is at least partially arranged between the two battery cells so as to enable the two battery cells to be spaced. The heat dissipation plate is used for half-wrapping the battery cells, so that the heat contact area between the battery cells is increased, and the heat dissipation efficiency of the battery cells is improved; and the folded edge can be in thermal contact with the shell so as to transfer heat to the shell for heat dissipation, and the heat dissipation efficiency of the battery pack is improved.

Description

Battery cell assembly, battery pack and electric equipment

Technical Field

The utility model relates to the technical field of power batteries, in particular to a battery cell assembly, a battery pack and electric equipment.

Background

In recent years, electric bicycles enter into thousands of households and become the first choice transportation means for people to travel daily, but the electric bicycles have the occurrence of fire and explosion accidents, and some electric bicycles even cause casualties, so that the personal safety and property safety of people are seriously affected. The main cause of the electric bicycle firing and explosion is overheating or breakage of the battery pack. The battery pack is a battery that provides a power source for an electric tool, an electric car, or an electric bicycle, and is also called a battery pack.

The electric bicycle has small volume, and the battery pack is difficult to be provided with the heat dissipation device, so that only natural heat dissipation can be adopted, and the heat dissipation of the battery pack is extremely challenging. Under the condition that a battery pack of the electric bicycle is continuously discharged or continuously charged, the heat of the battery pack cannot be dissipated, and the conditions of fire and even explosion are easy to occur. Especially for the cross-country motorcycle with high-rate discharge requirement, the current is larger, so the heating value is larger, and the battery pack is more prone to generating heat.

Disclosure of Invention

The embodiment of the utility model aims to provide a battery cell assembly, a battery pack and electric equipment, which can improve the heat dissipation efficiency of the battery pack.

In order to solve the above technical problems, in a first aspect, an embodiment of the present utility model provides a battery cell assembly, where the battery cell assembly includes a heat dissipation plate, a heat insulation structure, and a battery cell, where the two heat dissipation plates are disposed at intervals along a first direction, the heat dissipation plate includes a main body portion, two opposite sides of the main body portion along a second direction are provided with a first folded edge and a second folded edge, one side of the main body portion along a third direction is provided with a third folded edge, and the first folded edge, the second folded edge, and the third folded edge are all folded towards the other heat dissipation plate to form a containing space in cooperation with the main body portion; the battery cell is correspondingly arranged in the accommodating space, and is in thermal contact with the main body part, the first folded edge, the second folded edge and the third folded edge; the heat insulation structure is at least partially arranged between the two electric cores, and the two electric cores are distributed at intervals through the heat insulation structure.

In some embodiments, one end of the main body, the first folded edge and the second folded edge, which is away from the third folded edge, are enclosed to form a yielding opening; the electrode lugs of the battery core penetrate out of the heat dissipation plate at the abdication port; the battery cell assembly further comprises a top sealing strip, and the top sealing strip fills a gap between the yielding port and the tab.

In some embodiments, the top sealing strips are respectively arranged at two sides of the tab, and the top sealing strips at two sides are matched to clamp the tab.

In a second aspect, an embodiment of the present utility model further provides a battery pack, where the battery pack includes a housing and the cell assembly according to any one of the preceding claims, a plurality of the cell assemblies are arranged in the first direction to form a stack and are disposed in the housing, and the first folded edge, the second folded edge, the third folded edge, and the main body portion at two sides of the stack are in thermal contact with the housing.

In some embodiments, the battery pack further comprises a circuit board disposed within the housing, the circuit board electrically connected with the tabs of the cell assembly; the circuit board is provided with a plurality of groups of pressure relief holes, one group of pressure relief holes are correspondingly communicated with one battery cell, one group of pressure relief holes comprise one or more pressure relief holes, and the shell is provided with a ventilation valve for relieving pressure in the shell.

In some embodiments, the circuit board abuts against one end of the battery cell assembly, where the tab is provided, the circuit board is provided with a plurality of through holes, and one tab correspondingly passes through one through hole; the circuit board is provided with a plurality of conductive pieces, and the battery cells are electrically connected with the conductive pieces through the electrode lugs, so that a plurality of battery cells are connected in series.

In some embodiments, the battery pack further includes a controller and a separator, both disposed within the housing, the controller electrically connected to the circuit board, the separator disposed between the controller and the circuit board.

In some embodiments, a plurality of reinforcing ribs are arranged on the outer side surface of the shell at intervals;

and/or a handle is arranged on the outer side surface of the shell;

and/or, the outer side surface of the shell is provided with a foot pad;

and/or the shell is provided with an electric connector, and the electric connector is electrically connected with the controller;

and/or the material of the shell comprises metal.

In some embodiments, the gap between the cell assemblies and the inner wall of the housing is filled with a thermally conductive material, and the gap between the cell assemblies is also filled with a thermally conductive material.

In some embodiments, the battery pack further comprises a strap that ties at least one of the cell assemblies together.

In a third aspect, an embodiment of the present utility model further provides an electrical device, where the electrical device includes a battery pack as set forth in any one of the above.

Different from the situation of the related art, the battery cell assembly, the battery pack and the electric equipment are provided with the heat dissipation plate, and the heat dissipation plate is used for half-wrapping the battery cell through the main body part, the first folded edge, the second folded edge and the third folded edge so as to increase the thermal contact area between the heat dissipation plate and the battery cell and further improve the heat dissipation efficiency of the battery cell; and when the heating panel is installed in the casing, first hem, second hem and third hem, and the main part of pile both sides position also can be with the casing thermal contact to with heat transfer to the casing and dispel the heat, with the radiating efficiency that improves the battery package.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to scale, unless expressly stated otherwise.

Fig. 1 is a schematic view of a battery pack according to an embodiment of the present utility model;

fig. 2 is an exploded view of the battery pack of fig. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a schematic view of the upper shell of FIG. 2;

fig. 5 is a schematic view of the structure of the bottom chassis of fig. 2;

fig. 6 is an exploded view of the cell assembly of fig. 2;

FIG. 7 is a partial enlarged view at B in FIG. 2;

FIG. 8 is a schematic diagram of the circuit board structure of FIG. 2;

fig. 9 is a schematic diagram of the controller in fig. 2.

Reference numerals in the specific embodiments are as follows:

100. a battery pack;

1. a housing; 11. a cylinder; 111. reinforcing ribs; 112. a connection site; 12. an upper case; 121. a handle; 122. a ventilation valve; 123. an electrical connector; 13. a bottom case; 131. foot pads; 14. a seal ring;

2. a cell assembly; 21. a heat dissipation plate; 211. a main body portion; 212. a first hem; 213. a second flanging; 214. a third flanging; 215. a yielding port; 22. a heat insulating structure; 23. a battery cell; 231. a tab; 24. a top seal;

3. a strap;

4. a circuit board; 41. a first power wire holder; 42. a first communication wire holder; 43. a pressure relief hole; 44. a via hole; 45. a conductive member;

5. a controller; 51. the second power wire holder; 52. a second communication wire holder; 53. the third power wire holder; 54. a third communication wire holder;

6. and a partition plate.

Detailed Description

In order that the utility model may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween.

In the description of the present utility model, it should be noted that, orientation words such as "front, rear, upper, lower, left, right", "transverse, vertical, horizontal", and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and these orientation words do not indicate or imply that the apparatus or elements being referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

In the description of the present utility model, it should be noted that, the terms "first," "second," and the like are used for defining the components, and are merely for convenience in distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, so they should not be construed as limiting the scope of the present utility model. In the description of the embodiments of the present utility model, the meaning of "plurality" is two or more unless otherwise specifically defined.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.

In addition, the technical features mentioned in the different embodiments of the utility model described below can be combined with one another as long as they do not conflict with one another.

An embodiment of the present utility model provides a battery pack 100, as shown in fig. 1 and 2, the battery pack 100 includes a case 1, a battery cell assembly 2, a strap 3, a circuit board 4, a controller 5, and a separator 6. The shell 1 is used for accommodating the battery cell assembly 2, the binding belt 3, the circuit board 4, the controller 5 and the isolation plate 6; the cell assembly 2 is used for storing or releasing electric energy; the binding band 3 is used for binding at least one cell assembly 2 into a whole; the circuit board 4 is used for electrically connecting the plurality of cell assemblies 2; the controller 5 is used for monitoring parameters such as voltage, current, temperature and the like of the battery cell assembly 2 and controlling the charge and discharge of the battery cell assembly 2; the spacer 6 is used to separate the cell assembly 2 from the controller 5.

As shown in fig. 2, the housing 1 includes a cylindrical body 11, an upper case 12, and a bottom case 13, wherein openings are provided at both upper and lower ends of the cylindrical body 11, the upper case 12 seals the opening provided at the upper end of the cylindrical body 11, and the lower case seals the opening provided at the lower end of the cylindrical body 11. The bottom case 13 is fixedly provided to the cylinder 11, and is fixed to the cylinder 11 by welding or bonding, for example. The upper shell 12 is detachably arranged on the cylinder 11, for example, the upper shell 12 is installed on the cylinder 11 through screws, and a sealing ring 14 can be further arranged between the upper shell 12 and the cylinder 11 so as to enhance the sealing effect. In this embodiment, the housing 1 is rectangular, and the inner wall surface is configured as a plane to fit the rectangular battery cell assembly 2, so that the space in the housing 1 is fully utilized, and the energy density of the battery pack 100 is improved.

As shown in fig. 3, the outer circumferential surface of the cylindrical body 11 is provided with a plurality of reinforcing ribs 111, and the plurality of reinforcing ribs 111 are arranged at intervals along the circumferential direction of the cylindrical body 11, that is, the outer circumferential surface of the housing 1 is provided with a plurality of reinforcing ribs 111 at intervals along the axial direction of the cylindrical body 11. By providing the reinforcing ribs 111, the strength of the cylinder 11 can be enhanced, and the outer surface area of the cylinder 11 can be increased, thereby increasing the contact area with air and improving the heat dissipation efficiency of the cylinder 11. Optionally, the cylinder 11 and the bottom shell 13 are made of metal, for example, aluminum, and the bottom shell 13 is directly welded to the cylinder 11, so that the heat conduction efficiency of the bottom shell 13 of the cylinder 11 can be improved by setting the cylinder 11 and the bottom shell 13 to be made of metal, and the heat dissipation of the battery pack 100 is facilitated.

In some embodiments, as shown in fig. 3, a connection site 112 is formed between two adjacent reinforcing ribs 111 in a surrounding manner, and internal threads are provided on two opposite sides, so that after a screw passes through the upper shell 12, the screw can be installed in the connection site 112 to install the upper shell 12 on the cylinder 11, thereby eliminating the need for an additional installation part for installing the screw, simplifying the structure of the cylinder 11, reducing the production cost and the weight; the screw holes do not need to be formed in the wall of the cylinder 11, so that the thickness of the wall can be smaller than the diameter of the screw, which is beneficial to reducing the weight of the shell 1 and the material cost.

As for the upper case 12 described above, as shown in fig. 4, the upper case 12 is provided with a handle 121, an air-permeable valve 122, and an electrical connector 123, i.e., the case 1 is provided with the handle 121, the air-permeable valve 122, and the electrical connector 123. By providing the handle 121, the battery pack 100 is convenient to handle; the ventilation valve 122 is communicated with the inside of the shell 1 and the external environment, and the ventilation valve 122 is arranged, so that the pressure in the shell 1 can be released, and the explosion condition of the battery pack 100 is improved; the electric connector 123 is electrically connected with the battery cell assembly 2, so that an external cable is electrically connected with the battery pack 100 through the electric connector 123, input and output of electric power and communication information are realized, and quick plugging and unplugging can be realized. Optionally, the upper shell 12 is made of plastic, has insulation, can reduce the risk of electric shock to the user, and is easier to manufacture and form, so that the handle 121 is convenient to set, and the mounting positions of the ventilation valve 122 and the electric connector 123 are set.

As shown in fig. 5, the bottom shell 13 is provided with a foot pad 131 on a side of the bottom shell 13 facing away from the cylinder 11, i.e., the outer side of the housing 1 is provided with the foot pad 131. Through setting up callus on sole 131, can support and play battery package 100, reduce the wearing and tearing area of battery package 100 bottom surface, can also make battery package 100 and ground present the multi-point contact, make battery package 100 more stable when placing in ground. Optionally, the foot pad 131 is a protrusion formed by punching the bottom shell 13.

For the above-mentioned cell assemblies 2, as shown in fig. 2, a plurality of cell assemblies 2 are arranged along a first direction X to form a stack and are disposed in the housing 1, the first direction X is a thickness direction of the cell assemblies 2, and the cell assemblies 2 further have a width direction along a second direction Y and a length direction along a third direction Z.

As shown in fig. 6 and 7, the battery cell assembly 2 includes two heat dissipation plates 21, a heat insulation structure 22 and two battery cells 23, the two heat dissipation plates 21 are arranged at intervals along the first direction X, the heat insulation structure 22 is arranged between the two heat dissipation plates 21, the battery cells 23 are rectangular, and one battery cell 23 is correspondingly arranged between one heat dissipation plate 21 and one heat insulation structure 22, that is, the battery cell assembly 2 is arranged in the order of the heat dissipation plate 21-battery cell 23-heat insulation structure 22-battery cell 23-heat dissipation plate 21, and the two heat dissipation plates 21 are matched with the heat insulation structure 22 to respectively clamp the two battery cells 23. Optionally, the material of the heat dissipation plate 21 includes metal, such as aluminum, which has better heat conduction performance.

For the above-mentioned heat dissipation plate 21, as shown in fig. 6, the heat dissipation plate 21 includes a main body 211, two opposite sides of the main body 211 along the second direction Y are provided with a first flange 212 and a second flange 213, one side of the main body 211 along the third direction Z is provided with a third flange 214, and the first flange 212, the second flange 213 and the third flange 214 are all folded towards the other heat dissipation plate 21 to form a containing space in cooperation with the main body 211, so that the containing space of two heat dissipation plates 21 in the same battery module 2 is located on one opposite side, i.e. the inner side, of the two heat dissipation plates 21.

The accommodating space is used for accommodating a battery cell 23 correspondingly, that is, the battery cell 23 is correspondingly arranged in the accommodating space, and the battery cell 23 is in soaking contact with the main body 211, the first folded edge 212, the second folded edge 213 and the third folded edge 214, and is in direct or indirect contact in a plane laminating mode. Taking the battery cell 23 as a cuboid for example, four surfaces of the six surfaces of the battery cell 23 are in thermal contact with the heat dissipation plate 21, and one surface of the battery cell 23 is in thermal contact with the heat insulation structure 22, so that the heat dissipation plate 21 semi-wraps the battery cell 23 through the main body 211, the first folded edge 212, the second folded edge 213 and the third folded edge 214, the thermal contact area between the heat dissipation plate 21 and the battery cell 23 is increased, and the heat dissipation efficiency of the battery cell 23 is improved.

In the embodiment of the utility model, thermal contact refers to that two objects are contacted with each other through a diathermic wall, heat transfer exists between the two objects, the two objects can be free of physical contact, and other mediums can also exist between the two objects.

In some embodiments, the first folded edge 212, the second folded edge 213 and the third folded edge 214 may also be in thermal contact with the inner wall surface of the housing 1, and may directly transfer heat to the housing 1 for heat dissipation, so that the heat of the battery cell 23 is transferred to the housing 1 through the heat dissipation plate 21, and the overall heat dissipation efficiency of the battery pack 100 is improved. I.e. the two sides of each of the first flange 212, the second flange 213 and the third flange 214 are in thermal contact with the cell 23 and the inner wall of the housing 1, respectively, each acting as a heat transfer bridge between the two, and in the embodiment of the utility model, the thermal contact is achieved by direct contact of the flange with the cell 23 and the inner wall of the housing 1 or indirect contact through a heat conducting medium, so that the heat transfer distance is equal to the sum of the thickness of the flange and the thickness of the heat conducting medium. In addition, when the cell assembly 2 includes a plurality of cells arranged in the first direction X to form a cell stack, the main body 211 at both sides of the cell stack is also in thermal contact with the inner wall surface of the case 1, increasing the thermal contact area between the cell assembly 2 and the case 1, and improving the heat conduction efficiency.

In fact, the folded edge is difficult to be completely attached to the battery cell 23 and the housing 1 when in direct contact, and the heat transfer effect is also greatly reduced when the attachment is incomplete, so that a heat transfer medium is preferably arranged between the folded edge and the battery cell 23 and the housing 1 to improve the heat transfer effect, namely, the folded edge is in indirect contact with the battery cell 23 and the housing 1. In some embodiments, the thickness of the heat transfer medium is less than one tenth of the width of the flange, or less than 3mm, when the flange is in indirect contact with the cell 23 or the housing 1. In the utility model, the heat conducting medium is the heat conducting adhesive layer formed by glue filling, so that the heat of the battery cell 23 can be transferred to the shell 1, the battery cell 23 can be fixed in the shell 1 through the heat conducting adhesive, and meanwhile, the heat conducting adhesive is filled in the shell 1, so that the sealing effect of the battery pack can be improved; meanwhile, the battery cell 23 is expanded due to temperature rise during operation, and the heat-conducting glue can play a buffering effect.

In the above embodiment, since the main body 211, the first folded edge 212, the second folded edge 213 and the third folded edge 214 are in direct contact with the battery cell 23 and the inner wall of the housing 1 or indirectly contact with each other through the heat conducting medium, the positions of the battery cell 23 along the second direction Y and the third direction Z and the positions of the heat dissipating plate 21 along the second direction Y and the third direction Z are defined relative to the heat dissipating plate 21, and by providing the first folded edge 212, the second folded edge 213 and the third folded edge 214, the positions of the battery cell 23 and the heat dissipating plate 21 can be defined without using additional positioning parts, thereby reducing the production cost; since the first folded edge 212, the second folded edge 213 and the third folded edge 214 are clamped between the battery cell 23 and the housing 1, the gap between the inner wall of the housing 1 and the battery cell 23 can be shortened, the space occupation ratio of the battery cell 23 in the housing 1 can be increased, the space in the housing 1 can be fully utilized, and the energy density of the battery pack 100 can be further improved.

Further, as shown in fig. 6, the first flange 212, the second flange 213 and the third flange 214 are perpendicular to the main body 211, so as to be in thermal contact with the outer surface of the battery cell 23 and the inner wall of the housing 1, and improve the heat conduction efficiency between the flanges and the housing 1 and the battery cell 23.

Further, as shown in fig. 6, the lengths of the first flange 212 and the second flange 213 along the third direction Z are equal to the length of the main body 211 along the third direction Z, the length of the third flange 214 along the second direction Y is equal to the width of the main body 211 along the second direction Y, and the lengths of the first flange 212, the second flange 213 and the third flange 214 are sufficiently prolonged, so that the thermal contact area with the battery cell 23 and the housing 1 is increased.

Further, a heat conductive layer (not shown) may be further provided between the battery cell 23 and the heat dissipation plate 21, that is, between the battery cell 23 and the heat dissipation plate 21, via indirect contact with a heat conductive medium. The heat conduction layer can be formed by curing the heat conduction glue between the battery cell 23 and the heat dissipation plate 21, so that the problem that the heat conduction efficiency is reduced due to poor bonding effect caused by uneven contact surface between the battery cell 23 and the heat dissipation plate 21 can be solved, and the heat conduction layer formed by curing can also play a role in buffering the battery cell 23.

It should be understood that the above-mentioned case 1 in thermal contact with the flange may be the case 1 according to the embodiment of the present utility model, or may be other cases 1 not belonging to the embodiment of the present utility model, as long as the flange is in thermal contact with the inner wall of the case 1 when the heat dissipating plate 21 is mounted in the case 1.

In other embodiments, the first folded edge 212, the second folded edge 213, and the third folded edge 214 may be in thermal contact with the battery cell 23 or the housing 1 through one or both of them, so that the heat dissipation effect and the limiting effect are reduced.

It can be understood that, as shown in fig. 6 and 7, the main body 211, the first folded edge 212 and the second folded edge 213 enclose one end facing away from the third folded edge 214 to form a relief opening 215, and when a heat dissipation plate 21 cooperates with a heat insulation structure 22 to clamp a battery cell 23, the relief opening 215 cooperates with the heat insulation structure 22 to form an opening at one end of the battery cell assembly 2, and the opening is used for penetrating out a tab 231 of the battery cell 23. For supporting the fixed tab 231, the battery cell assembly 2 further includes a top seal 24, where the top seal 24 is disposed in the opening, and fills the entire opening under the condition of allowing the tab 231 to pass through, so as to play a role in fixing and supporting the tab 231, and in the third direction Z perpendicular to the third direction Z, the tab 231 can be buffer-protected, and in the third direction Z, the battery cell 23 can be buffer-protected.

Since the tab 231 is located at the middle position of the battery cell 23 in the thickness direction, the tab 231 passes through the middle of the top seal 24. In this embodiment, as shown in fig. 6 and 7, top seals 24 are respectively disposed at two sides of each tab 231, and the top seals at two sides of the tab 231 are respectively disposed at one side of the tab 231 facing the heat dissipation plate 21 and one side of the tab 231 facing the heat insulation structure 22, and the two top seals 24 cooperate to clamp the tab 231 to support and fix the tab 231; and the top seal 24 can isolate the battery core 23 from the circuit board 4, so that heat dissipation of the battery core 23 to the circuit board 4 is reduced, and the problem that the circuit board 4 is damaged due to high temperature is solved. It will be appreciated that a strip-shaped through hole may be formed in the middle of the top seal 24 for the tab 231 to pass through. Optionally, the top sealing strip 24 is made of heat-insulating material, such as aerogel or foam.

For the above-mentioned heat insulation structure 22, as shown in fig. 6 and 7, the heat insulation structure 22 is located between two heat dissipation plates 21, that is, the heat insulation structure 22 is located between two accommodating spaces, the length of the heat insulation structure 22 along the third direction Z and the width along the second direction Y may be equal to the length of the accommodating space along the third direction Z and the width along the second direction Y, or may be greater than the length of the accommodating space along the third direction Z and the width along the second direction Y, that is, the heat insulation structure 22 is located at least between two accommodating spaces and two electric cores 23 in the accommodating space, and the two electric cores 23 are distributed at intervals through the heat insulation structure 22. The heat insulation structure 22 is used for blocking heat transfer between two battery cells 23 in the same battery cell assembly 2, reducing mutual influence between the battery cells 23 and delaying thermal runaway propagation. Optionally, the material of the heat insulation structure 22 includes aerogel or foam, which has good heat insulation performance. Optionally, a heat insulation structure 22 may be disposed between two adjacent cell assemblies 2. Preferably, the heat insulation structure 22 is aerogel, so that the heat insulation effect is good, and a certain buffering effect can be achieved when the battery cell 23 expands with heat and contracts with cold.

In some embodiments, the heat insulation structure 22 is formed by pouring aerogel into the housing 1 for curing, or by fixing the aerogel pad between two cells 23 in the same cell assembly 2, so that the heat insulation structure is tightly attached to the cells 23, and can also play a role in fixing and buffering the cells 23.

As for the above-mentioned binding band 3, as shown in fig. 2, the binding band 3 binds at least one cell assembly 2 into one body, and in the embodiment of the present utility model, the binding band 3 binds a plurality of cell assemblies 2 into one body to form a cell stack, and the cell stack is disposed in the housing 1. The binding bands 3 may be steel belts or PET belts, and the number of the binding bands 3 may be one or more.

For the circuit board 4, the circuit board 4 is disposed in the housing 1, and the circuit board 4 is electrically connected with the tab 231 of the battery cell assembly 2, so as to realize charging and discharging of the battery cell assembly 2. As shown in fig. 8, the circuit board 4 is provided with a first power wire holder 41 and a first communication wire holder 42, the first power wire holder 41 is used for connecting a power cable and is electrically connected with the controller 5 through the power cable to transmit power; the first communication wire holder 42 is used for connecting a communication cable, and is electrically connected with the controller 5 through the communication cable, so as to transmit information such as temperature, voltage and the like of the battery cell 23 collected by the circuit board 4.

The circuit board 4 is propped against one end of the battery cell assembly 2, which is provided with the tab 231, so that the battery cell assembly 2 is clamped by the cooperation of the shell 1, and the limit of the battery cell assembly 2 is realized.

As shown in fig. 8, the circuit board 4 is provided with a plurality of groups of pressure relief holes 43, one group of pressure relief holes 43 is correspondingly communicated with one electric core 23, and one group of pressure relief holes 43 comprises one or a plurality of pressure relief holes 43, so that when the electric core 23 leaks, leakage and high-temperature expanded gas can flow out from the pressure relief holes 43 to one side of the circuit board 4 away from the electric core 23, which is not easy to affect the adjacent electric core 23, and the high-temperature expanded gas can also flow out of the shell 1 from the ventilation valve 122 on the upper shell 12 to release the pressure in the shell 1. The cell 23 may have a weak portion at a position corresponding to the pressure release hole 43, and when the internal voltage is too high, the cell 23 may be broken at the weak portion, so that the leakage and the high-temperature expanded gas may flow into the pressure release hole 43 from the broken portion.

In this embodiment, the circuit board 4 at least abuts against the top sealing strip 24, the top sealing strip 24 protrudes from the heat dissipation plate 21 or is flush with the heat dissipation plate 21 along the third direction Z, when the top sealing strip 24 is flush with the heat dissipation plate 21, the circuit board 4 abuts against the top sealing strip 24 and the heat dissipation plate 21 at the same time, so as to cooperate with the battery cell 23 to clamp the top sealing strip 24, and meanwhile, the top sealing strip 24 can play a role of buffering protection for the battery cell 23; and the position of the pressure release hole 43 corresponds to the gap between the two parts of the top sealing strip 24, when the battery cell 23 leaks, the leakage flows out of the gap between the two parts of the top sealing strip 24 and then flows into the pressure release hole 43. Optionally, the pressure release holes 43 are disposed at the edge of the circuit board 4, and one cell 23 corresponds to two pressure release holes 43. In the present utility model, the group of pressure relief holes 43 includes two pressure relief holes 43, and the two pressure relief holes 43 are respectively located at two ends of the circuit board 4 and are all in gap communication with the top seal bars 24 at two sides of the same tab 231.

As shown in fig. 8, the circuit board 4 is further provided with a plurality of through holes 44, and one tab 231 correspondingly passes through one through hole 44, and the through hole 44 may be in a strip shape so as to just pass through the tab 231. The side of the circuit board 4 facing away from the battery core assembly 2 is provided with a plurality of conductive members 45, the battery core 23 is electrically connected with the conductive members 45 through the tabs 231, and the conductive members 45 can be made of metal, for example, copper bars.

As shown in fig. 8, the conductive member 45 is disposed adjacent to the via hole 44 and is used for electrically connecting the tabs 231 of two adjacent cells 23, so that the plurality of cells 23 are connected in series. Specifically, the arrangement directions of the two adjacent electric cores 23 are opposite, that is, in the two adjacent electric cores 23, the positive electrode tab 231 corresponds to the negative electrode tab 231; the adjacent two electric cores 23 are connected in series through a conductive piece 45, and the conductive piece 45 is positioned between one positive electrode tab 231 and one negative electrode tab 231 of the adjacent two electric cores 23, so that the adjacent electric cores 23 are connected in series; the conductive members 45 are staggered on the circuit board 4, for example, in a W shape, and may sequentially connect the positive electrode tab 231 of the previous cell 23 with the negative electrode tab 231 of the next cell 23, or sequentially connect the negative electrode tab 231 of the previous cell 23 with the positive electrode tab 231 of the next cell 23, thereby sequentially connecting the plurality of cells 23 in series. The mode of connecting the plurality of battery cells 23 through the circuit board 4 does not need to be provided with additional wires, so that the production cost and the assembly difficulty are reduced, the integration level of the battery pack 100 can be improved, the volume of the battery pack 100 is reduced, and the energy density of the battery pack 100 is improved. The positive electrode tab 231 and the negative electrode tab 231 may be bent and abutted against the conductive member 45 after passing through the via hole 44, and connected to the conductive member 45 by welding, for example, by laser welding.

As shown in fig. 9, the controller 5 is disposed in the housing 1, and is mounted on a side of the circuit board 4 facing away from the battery cell assembly 2, and is electrically connected to the circuit board 4. Specifically, the controller 5 is provided with a second power wire holder 51 and a second communication wire holder 52 corresponding to the circuit board 4, the second power wire holder 51 being for connecting a power cable and being electrically connected with the first power wire holder 41 of the circuit board 4 through the power cable to transmit power; the second communication wire holder 52 is used for connecting a communication cable, and is electrically connected with the first communication wire holder 42 of the circuit board 4 through the communication cable, so as to receive information such as temperature, voltage and the like of the battery cell 23 collected by the circuit board 4. The controller 5 is further provided with a third power wire holder 53 and a third communication wire holder 54 connected with the electrical connector 123 on the housing 1, a connection cable (not shown) is provided at a side of the electrical connector 123 facing the inside of the housing 1, and the third power wire holder 53 and the third communication wire holder 54 are connected with the connection cable of the electrical connector 123 to electrically connect the controller 5 with the electrical connector 123, thereby inputting and outputting power and communication information with external devices through the electrical connector 123. In this embodiment, the controller 5 is a BMS (battery management system ) capable of protecting the safe use of the battery pack 100, and prolonging the service life of the battery pack 100 while guaranteeing the safety in the process of charging and discharging the battery pack 100.

For the above-mentioned division board 6, as shown in fig. 2, the division board 6 is disposed in the housing 1, and is mounted on one side of the circuit board 4 away from the battery cell assembly 2, and is located between the controller 5 and the circuit board 4, so as to block the leakage of the battery cell 23, and solve the problem that the leakage of the battery cell 23 splashes onto the controller 5 to cause damage to the controller 5. Wherein the controller 5 can be directly mounted to the isolation board 6, thereby being capable of functioning as insulation between the controller 5 and the circuit board 4. Optionally, the isolation plate 6 is made of an insulating material, such as a plastic plate. Specifically, the isolation board 6 is attached to the circuit board 4 and covers all the via holes 44 and the conductive members 45, and two pressure release holes 43 in the same group of pressure release holes 43 are respectively located at two sides of the isolation board 6, so that when splashes generated by damage and explosion of the battery cells 23 are ejected from the pressure release holes 43, the isolation board 6 can prevent the splashes from entering other battery cell assemblies 2 from the via holes 44 and falling onto the conductive members 45, thereby avoiding short circuits.

In some embodiments, the gap between the cell assembly 2 and the inner wall of the housing 1 may be filled with a heat conducting material (not shown), i.e. the cell assembly 2 and the inner wall of the housing 1 may be in thermal contact through indirect contact of a heat conducting medium; gaps among the plurality of battery cell assemblies 2 can also be filled with heat conducting materials, namely, the plurality of battery cell assemblies 2 can be in indirect contact with each other through heat conducting media to realize thermal contact, so that the heat conducting efficiency between the battery cell assemblies 2 and the shell 1 is further increased, the effect of fixing the battery cell assemblies 2 in the shell 1 can be achieved, the overall strength of the battery pack 100 is improved, and the waterproof performance of the battery pack 100 can be improved. Optionally, the heat conducting material is formed by pouring heat conducting glue into the shell 1 and solidifying.

The embodiment of the utility model also provides an electric device, which comprises the battery pack 100, and the electric device has the beneficial effects of the structure of the battery pack 100, and is not repeated here. The electric equipment can be an electric automobile or an electric bicycle, and can also be other electric equipment, and the electric equipment is not limited herein.

According to the battery cell assembly 2, the battery pack 100 and the electric equipment, the heat dissipation plate 21 is arranged, and the heat dissipation plate 21 is used for half-wrapping the battery cell 23 through the main body 211, the first folded edge 212, the second folded edge 213 and the third folded edge 214, so that the thermal contact area between the battery cell 23 is increased, and the heat dissipation efficiency of the battery cell 23 is further improved; when the heat dissipation plate 21 is mounted on the casing 1, the first flange 212, the second flange 213 and the third flange 214, and the main body 211 at two sides of the stack can also be in thermal contact with the casing 1, so that heat is transferred to the casing 1 for heat dissipation, and the heat dissipation efficiency of the battery pack 100 is improved; a heat conduction layer is arranged between the battery cell 23 and the heat dissipation plate 21, so that the heat conduction efficiency between the heat dissipation plate 21 and the battery cell 23 is improved; a heat conducting material is arranged between the battery cell assembly 2 and the shell 1, so that the heat conducting efficiency between the battery cell assembly 2 and the shell 1 is improved; the reinforcing ribs 111 are arranged outside the shell 1, so that the strength of the cylinder 11 can be enhanced, the outer surface area of the cylinder 11 can be increased, the contact area with air can be increased, and the heat dissipation efficiency of the shell 1 can be improved; the casing 1 and the heat dissipation plate 21 are made of metal, so that the heat dissipation performance can be improved, and the overall strength of the battery pack 100 can be ensured.

It should be noted that the description of the present utility model and the accompanying drawings illustrate preferred embodiments of the present utility model, but the present utility model may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are not to be construed as additional limitations of the utility model, but are provided for a more thorough understanding of the present utility model. The above-described features are further combined with each other to form various embodiments not listed above, and are considered to be the scope of the present utility model described in the specification; further, modifications and variations of the present utility model may be apparent to those skilled in the art in light of the foregoing teachings, and all such modifications and variations are intended to be included within the scope of this utility model as defined in the appended claims.

Claims (11)

1. A cell assembly, comprising:

the heat dissipation plate comprises a main body part, wherein a first folded edge and a second folded edge are arranged on two opposite sides of the main body part along a second direction, a third folded edge is arranged on one side of the main body part along a third direction, and the first folded edge, the second folded edge and the third folded edge are folded towards the other heat dissipation plate to form a containing space in a surrounding manner by matching with the main body part;

the battery cell is correspondingly arranged in the accommodating space and is in thermal contact with the main body part, the first folded edge, the second folded edge and the third folded edge; and

the heat insulation structure is at least partially arranged between the two electric cores, and the two electric cores are distributed at intervals through the heat insulation structure.

2. The cell assembly of claim 1, wherein the plurality of cells comprises,

one end of the main body part, the first folded edge and the second folded edge, which is away from the third folded edge, are enclosed to form an abdication opening;

the electrode lugs of the battery core penetrate out of the heat dissipation plate at the abdication port;

the battery cell assembly further comprises a top sealing strip, and the top sealing strip fills a gap between the yielding port and the tab.

3. The cell assembly of claim 2, wherein the plurality of cells are electrically isolated from each other,

the two sides of the tab are respectively provided with the top sealing strips, and the top sealing strips on the two sides are matched with and clamp the tab.

4. A battery pack, comprising:

a housing;

a cell assembly according to any one of claims 1 to 3, a plurality of said cell assemblies being arranged in said first direction to form a stack and being disposed within said housing, said first, second, third folds and said body portion at each side of said stack being in thermal contact with said housing.

5. The battery pack of claim 4, wherein the battery pack comprises a plurality of battery cells,

the battery pack also comprises a circuit board, wherein the circuit board is arranged in the shell and is electrically connected with the lugs of the battery cell assembly;

the circuit board is provided with a plurality of groups of pressure relief holes, one group of pressure relief holes are correspondingly communicated with one battery cell, one group of pressure relief holes comprise one or more pressure relief holes, and the shell is provided with a ventilation valve for relieving pressure in the shell.

6. The battery pack of claim 5, wherein the battery pack comprises a plurality of battery cells,

the circuit board is propped against one end of the battery cell assembly, which is provided with the electrode lug, the circuit board is provided with a plurality of through holes, and one electrode lug correspondingly passes through one through hole;

the circuit board is provided with a plurality of conductive pieces, and the battery cells are electrically connected with the conductive pieces through the electrode lugs, so that a plurality of battery cells are connected in series.

7. The battery pack of claim 5, wherein the battery pack comprises a plurality of battery cells,

the battery pack also comprises a controller and a separation plate, wherein the controller and the separation plate are both arranged in the shell, the controller is electrically connected with the circuit board, and the separation plate is arranged between the controller and the circuit board.

8. The battery pack of claim 4, wherein the battery pack comprises a plurality of battery cells,

a plurality of reinforcing ribs are arranged on the outer side surface of the shell at intervals;

and/or a handle is arranged on the outer side surface of the shell;

and/or, the outer side surface of the shell is provided with a foot pad;

and/or the shell is provided with an electric connector, and the electric connector is electrically connected with the controller;

and/or the material of the shell comprises metal.

9. The battery pack of claim 4, wherein the battery pack comprises a plurality of battery cells,

the gap between the battery cell assembly and the inner wall of the shell is filled with a heat conducting material, and the gap between the battery cell assemblies is filled with the heat conducting material.

10. The battery pack according to any one of claim 4 to 9, wherein,

the battery pack also includes a strap that ties up at least one of the cell assemblies together.

11. A powered device comprising a battery pack as claimed in any one of claims 4 to 10.