CN114709534A

CN114709534A - Battery pack and electric device

Info

Publication number: CN114709534A
Application number: CN202210329541.3A
Authority: CN
Inventors: 王慎波; 杨鹏程; 凌先进
Original assignee: Dongguan Poweramp Technology Ltd
Current assignee: Dongguan Poweramp Technology Ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2022-07-05

Abstract

The application discloses a battery pack and a power consumption device. The battery pack of the embodiment of the application comprises a shell, an adapter plate assembly and a battery cell module. The adapter plate assembly is arranged in the shell. The battery cell module is arranged in the shell and comprises a plurality of battery cells, and each battery cell comprises a battery cell main body, an electrode terminal and a conductive piece. The electric core main part sets up along first direction relatively with the keysets subassembly, and the inside of electric core main part is equipped with heating member. The electrode terminal is led out from one end of the cell main body facing the adapter plate assembly and is connected with the adapter plate assembly; the one end of leading to switching board subassembly from electric core main part is led out to electrically conductive, and electrically conductive connects in switching board subassembly and heating member. When the temperature of electric core is less than first threshold value, the heating member can switch on with the power through electrically conductive, in order to heat electric core, improves the performance of electric core.

Description

Battery pack and electric device

Technical Field

The present application relates to the field of batteries, and in particular, to a battery pack and a power consumption device.

Background

A rechargeable battery cell refers to a battery that can be used continuously by activating an active material by charging after the cell is discharged. Rechargeable electric cores are widely used in electronic devices, such as mobile phones, notebook computers, and the like.

A battery pack typically includes a plurality of battery cells to meet voltage requirements of electronic devices. In the development of battery technology, how to improve the working performance of a battery core at a lower temperature is always a research direction in the industry.

Disclosure of Invention

The application provides a battery pack and a power consumption device, which can improve the performance of a battery cell.

In a first aspect, the present application provides a battery pack including a housing, an adapter plate assembly, and a cell module. The adapter plate assembly is arranged in the shell. The battery cell module is arranged in the shell and comprises a plurality of battery cells, and each battery cell comprises a battery cell main body, an electrode terminal and a conductive piece. The electric core main part sets up along first direction relatively with the keysets subassembly, and the inside of electric core main part is equipped with heating member. The electrode terminal is led out from one end of the cell main body facing the adapter plate assembly and is connected with the adapter plate assembly; the one end of leading to switching board subassembly from electric core main part is led out to electrically conductive, and electrically conductive connects in switching board subassembly and heating member.

When the temperature of electric core is less than first threshold value, the heating member can switch on with the power through electrically conductive, in order to heat electric core, improves the performance of electric core. The electrode terminal is used for being electrically connected with an external circuit so as to realize the charging and discharging of the battery cell. The conductive piece and the electrode terminal are led out from the same end of the battery cell main body along the first direction and are connected to the switching board assembly, so that the distance between the conductive piece and the electrode terminal can be reduced, on-off control between the conductive piece and an external circuit and on-off control between the electrode terminal and the external circuit are facilitated, and the structure and the assembly process of the battery pack are simplified.

In some embodiments, the conductive elements include a first conductive element connecting the switching board assembly and the heating element and a second conductive element connecting the switching board assembly and the heating element.

In some embodiments, the plurality of cells are arranged in a third direction. The first conductive pieces of the plurality of battery cells are arranged along the third direction, so that the plurality of first conductive pieces are connected with the adapter plate assembly. The second conductive pieces of the plurality of battery cells are arranged along the third direction, so that the plurality of second conductive pieces are connected with the adapter plate assembly. .

In some embodiments, the electrode terminal and the conductive member are arranged in the second direction.

In some embodiments, the electrode terminals include a first electrode terminal and a second electrode terminal disposed in the second direction. In the second direction, the first conductive piece and the second conductive piece are positioned between the first electrode terminal and the second electrode terminal, so that the positions of the first conductive piece and the second conductive piece can be more concentrated, and the switching board assembly is convenient to connect the first conductive piece and the second conductive piece.

In some embodiments, an interposer assembly includes a first circuit board and first and second bus bars disposed on the first circuit board. The first circuit board is provided with a first through hole and a second through hole, the electrode terminal penetrates through the first through hole and is connected to the first bus piece, and the conductive piece penetrates through the second through hole and is connected to the second bus piece.

In some embodiments, the first bus bar has a first surface on a side facing away from the first circuit board, and the electrode terminal is connected to the first surface. The second bus piece is provided with a second surface on the side departing from the first circuit board, and the conductive piece is connected to the second surface. In the first direction, the distance between the first surface and the second surface is less than or equal to 2mm, so that the height difference between the electrode terminal bent to the first surface and the conductive piece bent to the second surface can be reduced, the difference between the bending position of the electrode terminal and the bending position of the conductive piece in the first direction is reduced, and the connection process is simplified.

In some embodiments, the first surface and the second surface are flush.

In some embodiments, the second bus bar member is provided with a third through hole, and the conductive member is connected to the second bus bar member through the third through hole and the second through hole.

In some embodiments, the first through hole and the second through hole corresponding to the at least one battery cell are arranged along the second direction. The electrode terminal and the conductive piece of the battery cell are arranged along the second direction, the first through hole and the second through hole corresponding to the battery cell are also arranged along the second direction, and the electrode terminal and the conductive piece can conveniently penetrate through the first through hole and the second through hole respectively.

In some embodiments, the battery pack further includes a second circuit board electrically connected to the first bus bar and the second bus bar. The second circuit board is provided with a control module, and the control module is used for controlling the connection between the second confluence piece and the power supply.

In some embodiments, the first bus bar includes a first connection tab and a second connection tab, one of which is connected to the total positive output pole of the cell module and the other of which is connected to the total negative output pole of the cell module. The second circuit board is connected with the first connecting sheet and the second bus piece, and the control module is used for controlling the connection and disconnection of the electrical connection between the second connecting sheet and the second bus piece.

When the temperature of electric core is less than first threshold value, control module converges the electric connection intercommunication between the piece with second connection piece and second, and the electric energy of electric core module converges through first connection piece, second connection piece and second and transmits to heating member to heat electric core, improve the performance of electric core. When the temperature of electric core was higher than the second threshold value, control module cut off the electric connection between second connection piece and the second piece of converging, made heating member stop heating.

In some embodiments, the conductive members include a first conductive member and a second conductive member arranged in the second direction, the first conductive member and the second conductive member being connected to the heating member. The second converges and includes third connection piece and fourth connection piece, and the first electrically conductive piece of at least two electric cores is connected to the third connection piece, and the second electrically conductive piece of at least two electric cores is connected to the fourth connection piece.

The third connecting piece and the fourth connecting piece are used for electrically connecting at least two battery cells, and electric energy can be simultaneously conveyed to heating elements of the at least two battery cells through the third connecting piece and the fourth connecting piece.

In some embodiments, the third connecting piece is connected to the first conductive piece of all battery cores, the fourth connecting piece is connected to the second conductive piece of all battery cores, and the third connecting piece and the fourth connecting piece connect the heating pieces of all battery cores in parallel.

In some embodiments, the battery pack further includes a first wire and a second wire, the first wire connecting the third tab and the second circuit board, the second wire connecting the fourth tab and the second circuit board.

In some embodiments, the battery pack further comprises an insulating member, at least a portion of which is located between the cell body and the adapter plate assembly.

When the group battery receives outside impact force, the part that the insulating part was located between electric core main part and the adapter plate subassembly can restrict the motion of electric core main part for the adapter plate subassembly, reduces electric core main part pressurized deformation, damaged risk, reduces the stress of transmitting the junction of electrode terminal and adapter plate subassembly, reduces electrode terminal deformation, torn possibility to the reliability and the security of group battery have been improved.

In some embodiments, the heating member includes a plurality of heating portions extending in the first direction, and the plurality of heating portions are disposed at intervals in the second direction. At least two adjacent heating portions have different sizes in the second direction. Heating parts with different widths are arranged at different positions of the battery core, so that the change of local heating power and the balanced heating at different positions of the battery core are realized, and the temperature consistency of the battery core is improved.

In some embodiments, the heating member includes a plurality of heating portions extending in the first direction, and the plurality of heating portions are arranged in an unequal-pitch arrangement in the second direction. The change of local heating power and the balanced heating of different positions of the battery cell are realized by changing the arrangement distance of the heating part, and the temperature consistency of the battery cell is improved.

In a second aspect, the present application provides an electric device, comprising an electric main body and the battery pack of any one of the embodiments of the first aspect, wherein the battery pack is connected to the electric main body and is used for supplying electric energy to the electric main body.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is apparent that the drawings described below are only some embodiments of the present application.

Fig. 1 is a schematic structural diagram of a battery pack provided in some embodiments of the present application;

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

fig. 3 is an exploded schematic view of a cell of a battery pack provided in some embodiments of the present application;

fig. 4 is a schematic structural diagram of a battery pack provided in some embodiments of the present application, in which a housing is omitted;

FIG. 5 is a schematic view of the battery pack shown in FIG. 4 at another angle, with the second circuit board omitted;

FIG. 6 is a schematic front view of the battery pack shown in FIG. 5 in a first direction;

fig. 7 is an exploded schematic view of the battery pack shown in fig. 5;

fig. 8 is a schematic structural view of an adapter plate assembly of a battery pack according to some embodiments of the present application;

FIG. 9 is a schematic structural diagram of the first circuit board shown in FIG. 8;

fig. 10 is a schematic circuit diagram of a battery pack provided in some embodiments of the present application;

fig. 11 is a schematic circuit diagram of a battery pack according to further embodiments of the present application;

fig. 12 is a schematic diagram of a cell of a battery pack provided by some embodiments of the present application;

fig. 13 is a schematic view of a cell of a battery pack provided in accordance with further embodiments of the present application;

fig. 14 is a schematic structural diagram of an electrical device according to some embodiments of the present application.

The reference numerals for the specific embodiments are as follows:

1. a housing; 11. an insulating member; 12. a first housing; 13. a second housing;

2. a transfer plate assembly; 21. a first circuit board; 211. a first through hole; 212. a second through hole; 22. a first bus bar; 221. a first connecting piece; 222. a second connecting sheet; 223. a fifth connecting sheet; 22a, a first surface; 23. a second bus bar; 231. a third connecting sheet; 232. a fourth connecting sheet; 23a, a second surface; 23b, a third through hole;

3. a battery cell module; 31. an electric core; 311. a cell main body; 3111. a cell shell; 3112. an electrode assembly; 3113. a first portion; 3113a, a first region; 3113b, a second region; 3114. a second portion; 3114a, a third area; 3114b, fourth region; 312. an electrode terminal; 3121. a first electrode terminal; 3122. a second electrode terminal; 313. a conductive member; 3131. a first conductive member; 3132. a second conductive member; 314. a heating member; 3141. a heating section;

4. a second circuit board; 41. a control module; 42. a sensor; 43. a control switch; 44. a line; 441. an electrode connection end; 442. a connecting end of the conductive piece; 443. a power supply connection end;

5. a first conductive line; 6. a second conductive line; 7. an insulating member;

1000. a battery pack; 2000. a power consumption main body;

x, a first direction; y, a second direction; z, third direction.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments.

The terms "first," "second," and the like in the description and claims of this application or in the foregoing drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order. In the embodiments of the present application, like reference numerals denote like parts, and a detailed description of the same parts is omitted in different embodiments for the sake of brevity.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the embodiments of the present application, "parallel" includes not only the case of absolute parallel but also the case of substantially parallel as conventionally recognized in engineering; meanwhile, "vertical" also includes not only the case of absolute vertical but also the case of substantially vertical as conventionally recognized in engineering. Illustratively, the angle between the two directions is 80 ° -90 °, which can be considered perpendicular; the angle between the two directions is 0 deg. -10 deg., and the two directions can be considered parallel.

The battery pack of the present application is described below with reference to the accompanying drawings.

As shown in fig. 1 to 5, the battery pack according to the embodiment of the present application includes a housing 1, an adapter plate assembly 2, and a cell module 3. The adapter plate assembly 2 is disposed within the housing 1. Electric core module 3 sets up in casing 1 and includes a plurality of electric cores 31, each electric core 31 includes electric core main part 311, electrode terminal 312 and electrically conductive piece 313, electric core main part 311 sets up with adapter plate subassembly 2 along first direction X relatively, the inside of electric core main part 311 is equipped with heating member 314, electrode terminal 312 is drawn forth and is connected in adapter plate subassembly 2 from electric core main part 311's one end towards adapter plate subassembly 2, electrically conductive piece 313 is drawn forth from electric core main part 311's one end towards adapter plate subassembly 2, electrically conductive piece 313 is connected in adapter plate subassembly 2 and heating member 314.

In this embodiment of the application, when the temperature of the battery cell 31 is lower than the first threshold, the heating element 314 can be conducted with the power supply through the conductive element 313 to heat the battery cell 31, so as to improve the performance of the battery cell 31. The electrode terminal 312 is used to electrically connect with an external circuit to achieve charging and discharging of the battery cell 31. The conductive piece 313 and the electrode terminal 312 are led out from the same end of the cell main body 311 along the first direction X and connected to the adapter plate assembly 2, so that the distance between the conductive piece 313 and the electrode terminal 312 can be reduced, on-off control between the conductive piece 313 and an external circuit and on-off control between the electrode terminal 312 and the external circuit can be conveniently realized, and the structure and the assembly process of the battery pack are simplified.

When the temperature of the battery cell 31 is higher than the second threshold, the electrical connection between the heating member 314 and the power supply is disconnected, and the heating member 314 stops heating the battery cell 31, so as to reduce the risk of overheating of the battery cell 31. The second threshold is higher than the first threshold.

In some embodiments, the first threshold is 0 ℃ and the second threshold is 35 ℃.

The casing 1 forms an accommodation chamber for accommodating the cell module 3. The casing 1 can protect the cell module 3 from the outside to restrict the charging or discharging of the liquid or other foreign matter affecting the cell module 3.

The plurality of battery cells 31 may be connected in series, in parallel, or in series-parallel, where the series-parallel refers to that the plurality of battery cells 31 are connected in series or in parallel.

The cell main body 311 includes a cell casing 3111, an electrode assembly 3112, and an electrolyte, and the electrode assembly 3112 and the electrolyte are accommodated in the cell casing 3111. The electrode assembly 3112 includes a positive electrode plate, a negative electrode plate, and a separator, and the battery cell 31 mainly depends on metal ions to move between the positive electrode plate and the negative electrode plate. One end of the electrode terminal 312 protrudes outside the cell casing 3111 and is used for electrical connection with an external circuit, and the other end of the electrode terminal 312 protrudes inside the cell casing 3111 and is used for electrical connection with the electrode assembly 3112. The electrode terminal 312 is used to electrically connect the electrode assembly 3112 with an external circuit to achieve charge and discharge of the battery cell 31.

Illustratively, the cell housing 3111 is made of aluminum plastic film.

The battery cell 31 may be a lithium ion battery cell, a sodium ion battery cell, a magnesium ion battery cell, or other types of battery cells, which is not limited in this application. Optionally, the battery cell 31 is a soft package battery cell.

In some embodiments, the cell housing 3111 includes a first portion 3113 and a second portion 3114, the first portion 3113 is connected to the second portion 3114, and the first portion 3113 and the second portion 3114 can be integrally formed, for example, by folding the same piece of aluminum-plastic film. The first section 3113 and the second section 3114 may be folded along the connection location such that the first section 3113 and the second section 3114 overlap, thereby encasing the electrode assembly 3112. In other embodiments, first section 3113 and second section 3114 may be separated and adhesively attached by an adhesive.

Illustratively, the first section 3113 includes a first zone 3113a and a second zone 3113b extending outwardly from a peripheral side of the first zone 3113a, and the second section 3114 includes a third zone 3114a and a fourth zone 3114b extending outwardly from a peripheral side of the third zone 3114 a. After the first and

second parts

3113 and 3114 are folded along the connection position, the first and

third regions

3113a and 3114a sandwich the electrode assembly 3112 together, and the second and

fourth regions

3113b and 3114b are overlapped and hermetically connected. The electrode terminal 312 passes between the second region 3113b and the fourth region 3114b to be electrically connected with the electrode assembly 3112.

In some embodiments, the electrode terminals 312 include a first electrode terminal 3121 and a second electrode terminal 3122. One of the first electrode terminal 3121 and the second electrode terminal 3122 is used for electrical connection with the positive electrode tab, and the other is used for electrical connection with the negative electrode tab. Exemplarily, the second direction Y is perpendicular to the first direction X.

In some embodiments, the first electrode terminal 3121 and the second electrode terminal 3122 are drawn from the same end of the cell main body 311 in the third direction Z and are disposed in the second direction Y. The second direction Y intersects with the third direction Z, and optionally, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

In an alternative embodiment, the first electrode terminal 3121 and the second electrode terminal 3122 may also be led out from both ends of the cell main body 311 in the third direction Z, respectively.

In some embodiments, the casing 1 includes a first casing 12 and a second casing 13, the first casing 12 and the second casing 13 enclose a receiving chamber, and the cell module 3 and the interposer assembly 2 are received in the receiving chamber.

The first casing 12 and the second casing 13 may be integrated by bonding, fastening, or other means to cover each other and jointly define a receiving cavity for receiving the cell module 3.

In some embodiments, the battery pack further includes an insulating member 7, and at least a portion of the insulating member 7 is located between the cell body 311 and the interposer assembly 2.

When the battery pack is subjected to external impact force, the part of the insulating piece 7, which is arranged between the cell main body 311 and the adapter plate assembly 2, can limit the movement of the cell main body 311 relative to the adapter plate assembly 2, reduce the risks of deformation and damage of the cell main body 311 under pressure, reduce the stress transmitted to the joint of the electrode terminal 312 and the adapter plate assembly 2, and reduce the possibility of deformation and tearing of the electrode terminal 312, so that the reliability and safety of the battery pack are improved.

In some embodiments, when the battery pack is subjected to an external impact force, the insulating member 7 has a cushioning effect, which can reduce an acting force acting on the cell main body 311 by deformation, and reduce the risk of breakage of the cell main body 311. Illustratively, the material of the insulating member 7 includes foam.

In some embodiments, the conductive elements 313 include a first conductive element 3131 and a second conductive element 3132, the first conductive element 3131 connecting the adapter plate assembly 2 and the heating element 314, the second conductive element 3132 connecting the adapter plate assembly 2 and the heating element 314.

One of the first and second

conductive members

3131 and 3132 is electrically connected to a positive pole of a power supply through the interposer assembly 2, and the other is electrically connected to a negative pole of the power supply through the interposer assembly 2. An electric current flows through the heating member 314 via the first and second

conductive members

3131, 3132, so that the heating member 314 heats the electric core 31.

In some embodiments, the first and second

conductive members

3131, 3132 are arranged along the second direction Y.

In some embodiments, the plurality of battery cells 31 are arranged along the third direction Z. Illustratively, the third direction Z is perpendicular to the first direction X and the second direction Y.

In some embodiments, the first conductive members 3131 of the plurality of battery cells 31 are arranged along the third direction Z, so that the first conductive members 3131 are connected to the interposer assembly 2. Alternatively, the first conductive members 3131 of the plurality of battery cells 31 are arranged in alignment along the third direction Z.

In some embodiments, the second conductive members 3132 of the plurality of battery cells 31 are arranged along the third direction Z, so that the second conductive members 3132 are connected with the interposer assembly 2. Alternatively, the second conductive members 3132 of the plurality of battery cells 31 are arranged in alignment along the third direction Z.

In some embodiments, the electrode terminals 312 and the conductive members 313 are arranged in the second direction Y. The electrode terminals 312 include first and

second electrode terminals

3121 and 3122 disposed in the second direction Y. In an example, in the second direction Y, the first and second

conductive pieces

3131 and 3132 may be located between the first and

second electrode terminals

3121 and 3122; in another example, the first electrode terminal 3121, the first conductive piece 3131, the second electrode terminal 3122, and the second conductive piece 3132 are arranged in the second direction Y; in still other examples, the first conductive member 3131, the first electrode terminal 3121, the second electrode terminal 3122, and the second conductive member 3132 are arranged in the second direction Y.

In some embodiments, the electrode terminals 312 include first and

second electrode terminals

3121 and 3122 disposed in the second direction Y. The first and second

conductive members

3131 and 3132 are positioned between the first and

second electrode terminals

3121 and 3122 in the second direction Y, so that the positions of the first and second

conductive members

3131 and 3132 are more concentrated, and the adapting board assembly 2 is convenient to connect the first and second

conductive members

3131 and 3132.

In some embodiments, the interposer assembly 2 includes a first circuit board 21, and a first bus bar 22 and a second bus bar 23 provided on the first circuit board 21, the first bus bar 22 being connected to the electrode terminal 312, and the second bus bar 23 being connected to the conductive member 313.

The first bus bar 22 is connected to the electrode terminals 312 of the plurality of battery cells 31 to connect the plurality of battery cells 31 in series, parallel, or series-parallel. The second bus bar 23 connects the heating elements 314 of the plurality of battery cells 31 in series, in parallel, or in series-parallel through the conductive members 313, so as to energize the heating elements 314 of the plurality of battery cells 31 at the same time.

In some embodiments, the first circuit board 21 comprises a flexible circuit board.

In some embodiments, the first circuit board 21 includes a Printed circuit board (Printed circuit boards).

In some embodiments, the first and second bus bars 22 and 23 are disposed on a side of the first circuit board 21 facing away from the cell main body 311.

In some embodiments, the first circuit board 21 is provided with a first through hole 211 and a second through hole 212, the electrode terminal 312 passes through the first through hole 211 and is connected to the first bus member 22, and the conductive member 313 passes through the second through hole 212 and is connected to the second bus member 23.

The first through hole 211 and the second through hole 212 are each provided in plurality. Exemplarily, the first electrode terminal 3121 passes through one first through hole 211, and the second electrode terminal 3122 passes through the other first through hole 211; the first conductive member 3131 passes through one second through-hole 212, and the second conductive member 3132 passes through the other second through-hole 212.

In some embodiments, the first bus bar 22 includes a first connection piece 221 and a second connection piece 222, one of the first connection piece 221 and the second connection piece 222 is connected to the total positive output pole of the cell module 3, and the other is connected to the total negative output pole of the cell module 3. Illustratively, the first connection piece 221 is connected to the electrode terminal 312 that is the overall negative output pole of the cell module 3, and the second connection piece 222 is connected to the electrode terminal 312 that is the overall positive output pole of the cell module 3.

In some embodiments, the second bus bar 23 includes a third connection piece 231 and a fourth connection piece 232, the third connection piece 231 connects the first conductive pieces 3131 of the at least two battery cells 31, and the fourth connection piece 232 connects the second conductive pieces 3132 of the at least two battery cells 31. In some embodiments, the third and

fourth tabs

231, 232 are arranged along the second direction Y.

In some embodiments, the first bus bar 22 further includes a fifth connecting piece 223, and the fifth connecting piece 223 is used to connect the electrode terminals 312 of the adjacent battery cells 31. Illustratively, the fifth connecting piece 223 is connected to the first electrode terminal 3121 of one battery cell 31 and the second electrode terminal 3122 of another battery cell 31 to connect the two battery cells 31 in series. Alternatively, the first electrode terminal 3121 of one cell 31 passes through one first through hole 211 and is bent onto the fifth connecting piece 223, the second electrode terminal 3122 of another cell 31 passes through another first through hole 211 and is bent onto the first electrode terminal 3121, and the first electrode terminal 3121, the second electrode terminal 3122, and the fifth connecting piece 223 are welded.

In some embodiments, the fifth connecting sheet 223 is provided in a plurality, and the plurality of fifth connecting sheets 223 connect the plurality of battery cells 31 in series, in parallel, or in series-parallel.

In some embodiments, the first bus bar 22 has a first surface 22a on a side facing away from the first circuit board 21, and the electrode terminal 312 is connected to the first surface 22 a. The second bus member 23 has a second surface 23a on a side facing away from the first circuit board 21, and the conductive member 313 is connected to the second surface 23 a. In the first direction X, the distance between the first surface 22a and the second surface 23a is less than or equal to 2mm, so that the height difference between the electrode terminal 312 bent to the first surface 22a and the conductive member 313 bent to the second surface 23a can be reduced, the difference between the bent position of the electrode terminal 312 and the bent position of the conductive member 313 in the first direction X can be reduced, and the connection process can be simplified.

Illustratively, the electrode terminal 312 is welded to the first surface 22a, and the conductive member 313 is welded to the second surface 23 a. The spacing between the first surface 22a and the second surface 23a in the first direction X is less than or equal to 2mm, and the welding uniformity can be improved.

In some embodiments, the first surface 22a and the second surface 23a are spaced apart by less than or equal to 1mm in the first direction X.

In some embodiments, in the first direction X, the first surface 22a and the second surface 23a are flush.

In some embodiments, the fifth coupling tab 223 includes a first surface 22 a. The first surfaces 22a of the plurality of fifth connecting pieces 223 are flush in the first direction X.

In some embodiments, the third tab 231 includes a second surface 23 a. In some embodiments, the second bus bar 23 is provided with a third through hole 23b, and the conductive member 313 passes through the third through hole 23b and the second through hole 212 and is connected to the second bus bar 23. Alternatively, the third through hole 23b is disposed opposite to the second through hole 212 in the first direction X.

In some embodiments, the third through hole 23b is provided in plurality. In the plurality of battery cells 31, the conductive member 313 of at least some of the battery cells 31 passes through the corresponding third through hole 23 b.

In some embodiments, the first through hole 211 and the second through hole 212 corresponding to at least one battery cell 31 are arranged along the second direction Y.

The electrode terminal 312 and the conductive member 313 of the battery cell 31 are disposed along the second direction Y, and the first through hole 211 and the second through hole 212 corresponding to the battery cell 31 are also disposed along the second direction Y, so that the electrode terminal 312 and the conductive member 313 respectively pass through the first through hole 211 and the second through hole 212.

In some embodiments, one cell 31 corresponds to two first through holes 211 and two second through holes 212, the two first through holes 211 are respectively penetrated by the first electrode terminal 3121 and the second electrode terminal 3122, and the two second through holes 212 are respectively penetrated by the first conductive member 3131 and the second conductive member 3132. The two first through holes 211 and the two second through holes 212 are aligned in a line in the second direction Y.

In some embodiments, the first through hole 211 and the second through hole 212 corresponding to at least one battery cell 31 are aligned along the second direction Y.

In some embodiments, the battery pack further includes a second circuit board 4, the second circuit board 4 being electrically connected to the first and

second bus members

22 and 23.

The second circuit board 4 may be used to control the connection between the first bus bar 22 and an external circuit, so as to charge or discharge the battery cell module 3. The second circuit board 4 can also be used to control the connection of the second bus bar 23 to the power supply, so that the heating element 314 operates and heats the battery cell 31. Optionally, the second circuit board 4 includes a battery management system, and can realize control of charging or discharging the battery cell module 3.

In some embodiments, the plurality of battery cells 31 are stacked in the third direction Z. The second circuit board 4 is disposed on one side of the cell module 3 along the third direction Z. Exemplarily, the second circuit board 4 is perpendicular to the first circuit board 21.

In some embodiments, an insulating member 11 is disposed in the first casing 12, and the insulating member 11 is disposed between the cell module 3 and the second circuit board 4. Insulating part 11 can separate electric core module 3 and second circuit board 4 to reduce electric core module 3 and damage the risk of second circuit board 4 when the inflation, improve the insulating effect between electric core module 3 and the second circuit board 4.

In some embodiments, the insulator 11 is plate-shaped.

In some embodiments, the second circuit board 4 is provided with a control module 41, and the control module 41 is used for controlling the connection of the second bus bar 23 with the power supply. The power supply provides electrical power to the heating element 314 to cause the heating element 314 to generate heat. The external power of group battery is as the power of heating member 314, also can electric core module 3 as the power of heating member 314.

In some embodiments, the first bus bar 22 includes a first connection piece 221 and a second connection piece 222, one of the first connection piece 221 and the second connection piece 222 is connected to the total positive output pole of the cell module 3, and the other is connected to the total negative output pole of the cell module 3. The second circuit board 4 connects the first connecting piece 221 and the second bus bar 23, and the control module 41 can be used for controlling the connection and disconnection of the electrical connection between the second connecting piece 222 and the second bus bar 23.

When the temperature of the battery cell 31 is lower than the first threshold value, the control module 41 electrically connects the second connecting piece 222 and the second bus bar 23, and the electric energy of the battery cell module 3 is transmitted to the heating member 314 through the first connecting piece 221, the second connecting piece 222 and the second bus bar 23, so as to heat the battery cell 31, thereby improving the performance of the battery cell 31.

When the temperature of the battery cell 31 is higher than the second threshold value, the control module 41 cuts off the electrical connection between the second connecting piece 222 and the second bus bar 23, so that the heating element 314 stops heating.

As shown in fig. 10, the control module 41 is electrically connected to the cell module 3 through a line 44 of the second circuit board 4. Line 44 may have two electrode connection terminals 441 and two conductor connection terminals 442. One electrode connection terminal 441 is electrically connected to the first connection piece 221, and the other electrode connection terminal 441 is electrically connected to the second connection piece 222; one conductive piece connection end 442 is electrically connected to the third connection piece 231, and the other conductive piece connection end 442 is electrically connected to the fourth connection piece 232. One electrode connection terminal 441 and one conductive member connection terminal 442 are connected through a communication state, and a control switch 43 is provided between the other electrode connection terminal 441 and the other conductive member connection terminal 442.

The battery pack includes a sensor 42, and the sensor 42 detects the temperature of the battery cell 31 in real time and feeds back a temperature signal to the control module 41. The control module 41 adjusts the control switch 43 according to the temperature signal to change the on/off of the line between the other electrode connecting terminal 441 and the other conductive member connecting terminal 442, thereby operating and stopping the heating member 314. In some embodiments, the sensor 42 is provided on the first circuit board 21.

As shown in fig. 11, in other embodiments, the second circuit board 4 is provided with a circuit 44 electrically connected to the cell module 3. Line 44 has two power connection terminals 443 and two conductor connection terminals 442; one power connection terminal 443 for electrical connection with the positive pole of a power supply external to the battery pack, and the other power connection terminal 443 for electrical connection with the negative pole of the power supply external to the battery pack; one conductive connection end 442 is electrically connected to the third connection pad 231, and the other conductive connection end 442 is connected to the fourth connection pad 232.

One power supply connection terminal 443 and one conductor connection terminal 442 are connected, and a control switch 43 is provided between the other power supply connection terminal 443 and the other conductor connection terminal 442.

The sensor 42 detects the temperature of the battery cell 31 in real time and feeds a temperature signal back to the control module 41. The control module 41 adjusts the control switch 43 according to the temperature signal to change the on/off of the line between the other power connection 443 and the other conductive member connection 442, thereby activating and deactivating the heating member 314.

In the present application, the heating element 314 may be connected to a power source in the manner shown in FIG. 10 or in the manner shown in FIG. 11. In some examples, the heating elements 314 of some of the cells 31 may be connected to a power source in the manner shown in fig. 10, and the heating elements 314 of other cells 31 may be connected to a power source in the manner shown in fig. 11.

In some embodiments, the third connecting piece 231 connects the first conductive pieces 3131 of the at least two battery cells 31, and the fourth connecting piece 232 connects the second conductive pieces 3132 of the at least two battery cells 31.

The third connection piece 231 and the fourth connection piece 232 electrically connect the at least two electric cells 31, and electric energy can be simultaneously transmitted to the heating elements 314 of the at least two electric cells 31 through the third connection piece 231 and the fourth connection piece 232.

In some embodiments, the third connecting piece 231 is connected to the first conductive pieces 3131 of all the battery cells 31, the fourth connecting piece 232 is connected to the second conductive pieces 3132 of all the battery cells 31, and the third connecting piece 231 and the fourth connecting piece 232 connect the heating members 314 of all the battery cells 31 in parallel.

In some embodiments, the first conductive members 3131 of the plurality of battery cells 31 are arranged in the third direction Z, so that the first conductive members 3131 of the plurality of battery cells 31 are welded to the third connection pieces 231. The second conductive pieces 3132 of the plurality of battery cells 31 are arranged in the third direction Z so that the second conductive pieces 3132 of the plurality of battery cells 31 are soldered to the fourth connection tab 232.

In some embodiments, the battery pack further includes a first lead 5 and a second lead 6, the first lead 5 connecting the third tab 231 and the second circuit board 4, the second lead 6 connecting the fourth tab 232 and the second circuit board 4.

In some embodiments, the first wire 5 is connected to one end of the third connecting pad 231 near the second circuit board 4 along the third direction Z, and the second wire 6 is connected to one end of the fourth connecting pad 232 near the second circuit board 4 along the third direction Z.

In some embodiments, as shown in fig. 12, the heating member 314 includes a plurality of heating portions 3141 extending in the first direction X, and the plurality of heating portions 3141 are disposed at intervals in the second direction Y. At least two adjacent heating portions 3141 differ in size in the second direction Y.

According to the embodiment of the application, the heating parts 3141 with different widths can be arranged at different positions of the battery cell 31, so that the change of local heating power and the balanced heating of different positions of the battery cell 31 are realized, and the temperature consistency of the battery cell 31 is improved. The width of the heating part 3141 refers to a dimension of the heating part 3141 in the second direction Y.

In some embodiments, the widths of the plurality of heating parts 3141 increase first and then decrease in the second direction Y.

In some embodiments, as shown in fig. 13, the heating member 314 includes a plurality of heating portions 3141 extending in the first direction X, and the plurality of heating portions 3141 are arranged in an unequal interval arrangement in the second direction Y.

According to the embodiment of the application, the arrangement distance of the heating parts 3141 can be changed, so that the change of local heating power and the balanced heating of different positions of the battery cell 31 can be realized, and the temperature consistency of the battery cell 31 can be improved.

In some embodiments, the spacing between adjacent heating portions 3141 increases and then decreases in the second direction Y.

As shown in fig. 14, some embodiments of the present application provide an electric device, which includes an electric main body 2000 and a battery pack 1000. The battery pack 1000 is connected to the power consuming body 2000 and is used to supply electric power to the power consuming body 2000.

The battery pack 1000 may be the battery pack provided in any of the above embodiments.

The electricity main body 2000 can realize a set function by being driven by electric power. The powered device may be a portable device, a laptop computer, an electric toy and tool, an energy storage system, a drone, a cleaning tool, and the like. Power tools include metal cutting power tools, cleaning tools, and the like, such as electric drills, electric wrenches, vacuum cleaners, sweeping robots, and the like. The embodiment of the present application does not specifically limit the above-mentioned electric devices.

While the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and in particular, features shown in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. A battery pack, comprising:

a housing;

the adapter plate assembly is arranged in the shell;

the battery core module is arranged in the shell and comprises a plurality of battery cores, each battery core comprises a battery core main body, an electrode terminal and a conductive piece, the battery core main body and the adapter plate component are oppositely arranged along a first direction, a heating piece is arranged in the battery core main body, the electrode terminal is led out from the battery core main body towards one end of the adapter plate component and is connected with the adapter plate component, the conductive piece is led out from the battery core main body towards one end of the adapter plate component, and the conductive piece is connected with the adapter plate component and the heating piece.

2. The battery as defined in claim 1, wherein the conductive members include a first conductive member connecting the switching board assembly and the heating element, and a second conductive member connecting the switching board assembly and the heating element.

3. The battery pack of claim 2, wherein the plurality of cells are arranged in a third direction;

the first conductive members of the plurality of cells are arranged in the third direction, and the second conductive members of the plurality of cells are arranged in the third direction.

4. The battery pack according to claim 2, wherein the electrode terminals and the conductive members are arranged in the second direction.

5. The battery according to claim 4, wherein the electrode terminals include a first electrode terminal and a second electrode terminal disposed in the second direction;

the first and second conductive members are located between the first and second electrode terminals in the second direction.

6. The battery pack according to any one of claims 1 to 5, wherein the adapter plate assembly includes a first circuit board and first and second bus bars provided to the first circuit board;

the first circuit board is provided with a first through hole and a second through hole, the electrode terminal penetrates through the first through hole and is connected to the first bus piece, and the conductive piece penetrates through the second through hole and is connected to the second bus piece.

7. The battery pack according to claim 6, wherein the second bus member is provided with a third through hole, and the conductive member is connected to the second bus member through the third through hole and the second through hole.

8. The battery pack according to claim 6, further comprising a second circuit board electrically connected to the first bus member and the second bus member;

the second circuit board is provided with a control module, and the control module is used for controlling the connection between the second confluence piece and a power supply.

9. The battery pack of claim 8, wherein the first bus bar comprises a first connection tab and a second connection tab, one of the first connection tab and the second connection tab being connected to a total positive output pole of the cell module and the other of the first connection tab and the second connection tab being connected to a total negative output pole of the cell module;

the second circuit board is connected with the first connecting sheet and the second bus piece, and the control module is used for controlling the on-off of the electric connection between the second connecting sheet and the second bus piece.

10. The battery pack as set forth in claim 8, wherein the conductive members include a first conductive member and a second conductive member arranged in a second direction, the first conductive member and the second conductive member being connected to the heating member;

the second confluence piece comprises a third connecting piece and a fourth connecting piece, the third connecting piece is connected with at least two first conductive pieces of the battery cells, and the fourth connecting piece is connected with at least two second conductive pieces of the battery cells.

11. The battery pack according to claim 1, wherein the heating member includes a plurality of heating portions extending in the first direction, the plurality of heating portions being provided at intervals in a second direction;

at least two adjacent heating portions have different sizes in the second direction.

12. The battery pack according to claim 1, wherein the heating member includes a plurality of heating portions extending in the first direction, the plurality of heating portions being arranged in an unequal-pitch array in the second direction.

13. An electrical device, comprising:

a power consumption main body; and

the battery pack according to any one of claims 1 to 12, which is connected to the electricity using body and is used to supply electric energy to the electricity using body.