CN218827319U - Battery and electronic device - Google Patents

Abstract

The application provides a battery and electronic equipment, battery include two at least electric cores, and wherein, electric core includes electrode subassembly, cladding at the shell of electrode subassembly periphery and have the protection piece of detection end, and the one end terminal surface at the shell is installed with the directional electrode subassembly's of detection end to the protection piece. Through the arrangement, the detection end directly points to the electrode assembly, the heating condition of the electrode assembly can be directly detected, and the detection precision can be increased, so that the reliability and safety of product operation are improved, and the risk is reduced.

Description

Battery and electronic device

Technical Field

The application relates to the technical field of lithium ion batteries, in particular to a battery and electronic equipment.

Background

As the light weight of electronic products is higher, the housings of the products are thinner and thinner, and the structural strength of the products is insufficient to protect the built-in lithium battery in extreme environments. Especially, when the electronic product is subjected to an external force (such as falling, treading, etc.) during the use process, the external sharp object is very easy to damage the internal battery cell responsible for energy storage, so that the chemical energy of the electronic product is released instantly, and the electronic product is ignited and exploded. The packaging mode commonly used by the battery in the current notebook computer industry can not ensure the reliability and safety of the product operation. In view of the above, it is urgently needed to develop a new battery to solve the problem that the reliability and safety of the product operation cannot be met in the commonly-used packaged lithium battery.

SUMMERY OF THE UTILITY MODEL

The purpose of this application is in order to solve the problem that the product operational reliability and the security that the current lithium cell exists commonly used encapsulation can not satisfy lightweight increasingly. In view of the above, embodiments of the present application are directed to providing a battery and an electronic device, which improve reliability and safety of product operation by changing a mounting manner of a protection member and a housing.

In order to solve the above problem, in a first aspect, the present application provides a battery, which includes at least two battery cells, each battery cell includes an electrode assembly, a casing covering the periphery of the electrode assembly, and a protection member having a detection end, and the external protection member is mounted on an end face of the casing in a manner that the detection end points to the electrode assembly.

In yet another possible embodiment, the electrode assembly includes a body, and a first tab and a second tab extending outwardly from one end of the body, the case is recessed toward the body between the first tab and the second tab to form a groove, and the protection member is placed in the groove.

In a further possible embodiment the dimension of the groove in the direction from the first tab to the second tab is 3-20 mm and/or the dimension of the groove in the direction of the length extension of the first tab is 2-5 mm.

In a further possible embodiment, the protection member includes a first connection terminal and a second connection terminal, the first connection terminal connects the first tab, and the second connection terminal connects the circuit board assembly.

In a further possible embodiment, the battery cell comprises a first transition portion arranged outside the housing, and the first tab is electrically connected to the first transition portion and is electrically connected to the first connection terminal through the first transition portion.

In another possible embodiment, the battery cell includes a first metal sheet connecting the protection member and the first transition portion, the first metal sheet includes a first flat plate portion and a second flat plate portion distributed in a step shape, the first flat plate portion is located between the second flat plate portion and the body, the first flat plate portion is connected with the protection member, and the second flat plate portion is connected with the first transition portion.

In another possible embodiment, the battery cell includes a second metal sheet connecting the protection member and the circuit board assembly, the second metal sheet includes a first connecting lug connecting the second connecting terminal and a sheet main body, and an end of the sheet main body away from the second connecting terminal is connected to the circuit board assembly.

In a further possible embodiment, an end of the sheet-like body remote from the second connection terminal includes a second engaging lug, and the sheet-like body is connected to the circuit board assembly via the second engaging lug.

In yet another possible embodiment, the battery includes a circuit board assembly and an even number of cells, the even number of cells being symmetrically distributed along the circuit board assembly.

In another possible embodiment, the circuit board assembly includes a control circuit and a circuit board carrying the control circuit, and an even number of the battery cells are distributed on two sides of the circuit board assembly.

In yet another possible embodiment, the battery includes an insulating fastening unit that covers the circuit board assembly and the battery cell.

In a further possible embodiment, the insulating fastening unit comprises an insulating film comprising an insulating film base layer, which is bonded to the circuit board assembly and/or the cell by an insulating film bonding layer.

In yet another possible embodiment, the insulating film includes an insulating film heat conductive layer surrounding an insulating film base layer, and the insulating film includes a plurality of insulating film bonding layers, one of the plurality of insulating film bonding layers being disposed between the insulating film heat conductive layer and the insulating film base layer.

In a further possible embodiment, the insulating fastening unit further comprises a glue fixation bracket arranged between the insulating film and the circuit board assembly and/or the battery cell.

A second aspect of the present application provides an electronic device, wherein the battery is disposed in the electronic device. This application is through adopting the one end terminal surface with the protection piece with the mode installation shell of the directional electrode subassembly of probe end for the direct directional electrode subassembly of probe end, the condition of generating heat of this kind of mode direct probe electrode subassembly, therefore multiplicable detection precision makes detection precision more accurate, thereby has promoted the reliability and the security of product operation, has reduced the risk.

Drawings

Fig. 1 is a schematic structural diagram of a battery according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a battery core unit according to an embodiment of fig. 1.

Fig. 3 is a schematic structural diagram of a battery cell according to an embodiment in fig. 2.

Fig. 4 is a partial cross-sectional view of fig. 3.

Fig. 5 is an enlarged view of the second metal sheet according to one embodiment of fig. 3.

Fig. 6 is an enlarged view of the first metal sheet according to one embodiment of fig. 3.

Fig. 7 is a partial cross-sectional view of a battery of one embodiment of fig. 1.

FIG. 8 is a schematic sectional view of the structure of the insulating film in FIG. 7 according to an embodiment.

FIG. 9 is a cross-sectional view of an insulating film according to still another embodiment of FIG. 7.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In one aspect, the present application provides a battery for electronic equipment, and as shown in fig. 1 to fig. 3, the battery includes at least two battery cells 11, each battery cell 11 includes an electrode assembly 111, a housing 112 covering the periphery of the electrode assembly 111, and a protection member 114 mounted on an end face of one end of the housing 112, where the protection member 114 has a detection end 1141, and the detection end 1141 is directed toward the electrode assembly 111. Here, the battery cells 11 are used to store electrical energy. The number of the battery cells 11 is determined according to the nominal voltage and current required by the battery. This application is through installing the one end terminal surface at electric core with protection piece to with the directional electrode subassembly of probe end, because the direct directional electrode subassembly of probe end, can directly survey the condition of generating heat of electrode subassembly, thereby multiplicable detection precision, and then promoted the reliability and the security of product operation, reduced the risk.

In yet another embodiment, the housing 112 is a metal shell. The metal used for the housing 112 may be alloy steel. The shell can effectively improve the strength and the anti-sharp object piercing capacity of the battery, ensure that the battery can still be sufficiently protected under extreme conditions, and greatly reduce the potential safety hazard. The battery of this application has solved the not enough problem of current battery protection, compares in current soft packet Pack technique, and this application has stronger technical advantage at structural strength and protectiveness.

In another embodiment, the battery includes a circuit board assembly 12 for controlling charging and discharging of the battery cell 11. The circuit board assembly 12 includes a connector 124 for simultaneously connecting a plurality of battery cells 11. The circuit board assembly 12 is used for controlling charging and discharging of the battery cell 11, and the connector 124 is used for connecting an external port to charge and discharge the battery.

In still another embodiment, referring to fig. 3, the case 112 includes a bottom case 1121 having an open cavity and a cover plate 1122 covering the open cavity of the bottom case 1121, and the electrode assembly 111 is received in a space defined by the bottom case 1121 and the cover plate 1122. By doing so, the case 112 may provide sealing and protection for the positive and negative electrode tabs and the electrolyte of the electrode assembly 111; meanwhile, the shell 112 also has an anti-puncture function, so that the space occupied by the battery can be saved, and particularly, the volume ratio of the battery cell 11 is improved.

In yet another embodiment, the thickness of the housing 112 is 0.05mm to 0.15mm.

In yet another embodiment, the housing 112 may be formed from an alloy steel having a tensile modulus up to 193GPa and/or a tensile strength up to 580MPa. The housing 112 with this property has better elasticity and impact resistance. The housing 112 of the present application, compared with the housing packaged by the conventional aluminum-plastic film, has better elasticity and toughness and higher mechanical strength, so that the battery cell 11 is not damaged when bearing a larger external force.

The electrode assembly 111 is formed by winding or superposing pole pieces, each pole piece comprises a positive pole piece and a negative pole piece, and a diaphragm for preventing the positive pole piece and the negative pole piece from being directly communicated is arranged between the positive pole piece and the negative pole piece. The electrode assembly 111 may be combined by winding or stacking the positive and negative electrode sheets to achieve chemical storage.

Referring to fig. 1 and 2, the circuit board assembly 12 includes a circuit board 125, a control circuit 123 disposed on the circuit board 125, and a first nickel brick 121 and a second nickel brick 122 used in pair, where one of the first nickel brick 121 and the second nickel brick 122 is used to connect to a negative electrode of the battery cell 11, and the other is connected to a negative electrode of the battery cell 11.

In one embodiment, referring to fig. 1-2, the battery includes a plurality of cells 11, and each cell 11 has a first tab 1112 and a second tab 1113. The circuit board 125 is provided with first nickel bricks 121 having the same number as the number of the cells 11 and second nickel bricks 122 having the same number as the number of the cells 11. Each first tab 1112 is connected to a corresponding first nickel brick 121 and each second tab 1113 is connected to a corresponding second nickel brick 122. One of the first tab 1112 and the second tab 1113 is a positive electrode, and the other is a negative electrode.

In yet another embodiment, referring to fig. 3-4, the electrode assembly 111 includes a body 1111 and first and second tabs 1112 and 1113 extending outwardly from one end of the body 1111, and the case 112 is recessed into the body 1111 between the first and second tabs 1112 and 1113 to form a groove 113, wherein,

the protector 114 is placed in the groove 113 in such a manner that the probe end 1141 is directed toward the body 1111. In this way, since the probe end 1141 is directly directed to the body 1111, the heat generation of the body 1111 can be directly detected, and the detection accuracy can be increased.

Specifically, the groove 113 includes a bottom wall 1131 extending in a direction from the first tab 1112 to the second tab 1113, and the protection member 114 is placed in the groove 113 in such a manner that the probe end 1141 is directed toward the bottom wall 1131. The pointing of the probe end 1141 toward the body 1111 is accomplished by pointing the probe end 1141 toward the bottom wall 1131. By placing the protection member 114 in this way, the gap between the first tab 1112 and the second tab 1113 is fully utilized, so that the occupied space of the battery cell 11 can be saved, and the volume ratio of the battery cell 11 can be increased. And because the probe end 1141 points to the bottom wall 1131, the probe end 1141 can be tightly attached to the housing 112 of the battery cell 11, which is helpful to increase the detection accuracy. The specific arrangement can be seen with reference to fig. 3-4.

In this application, it is further stated that: the first tab 1112 and the second tab 1113 are led out from different pole pieces in the winding core 111. If the electrode assembly 111 is wound, the first tab 1112 and the second tab 1113 are both single-layered, and if the electrode assembly 111 is laminated, the first tab 1112 and the second tab 1113 are both multi-layered.

In the present application, the protective member 114 includes TCO. The TCO refers to a temperature change-over switch protection piece ThermalCut-Off, which is an overcurrent protection device, so that when the battery is abnormally operated, such as overcharging, and when the temperature is higher than a set temperature, the TCO cuts Off a charging circuit, the battery can not be continuously charged, and the battery is ensured to be in a safe state.

In another embodiment, the size of the groove 113 in the direction from the first tab 1112 to the second tab 1113 is 3-20 mm, which is generally the width direction of the battery cell 11.

In another embodiment, the size of the groove 113 in the length extending direction of the first tab 1112 is 2 to 5mm, and the length extending direction of the first tab 1112 is generally the length direction of the battery cell 11.

Specifically, the groove 113 may be a through groove that is open in the thickness direction of the battery cell 11, as shown in fig. 3 and 4. That is, the bottom wall end of the bottom shell 1121 has a first notch, the cover plate 1122 has a second notch corresponding to the first notch, and the concave groove 113 is recessed from the side wall of the bottom shell 1121 toward the inside of the housing 112 until it abuts against each side of the first notch and the second notch. The side wall and the bottom wall of the bottom shell 1121 may be integrally formed, and a part of the bottom shell 1121 may be welded, for example, the side wall of the bottom shell 1121 is recessed toward the inside of the housing 112 to a position abutting against the first notch may be welded. The side wall and the bottom wall of the bottom shell 1121 may also be formed as separate bodies and then welded.

In another embodiment, referring to fig. 3, the protection member 114 includes a first connection terminal 1142 and a second connection terminal 1143, wherein the first connection terminal 1142 is close to the first tab 1112, the second connection terminal 1143 is far from the first tab 1112, the first connection terminal 1142 is connected to the first tab 1112, and the second connection terminal 1143 is connected to the circuit board assembly 12. In this way, the protection member 114 is connected in series between the first tab 1112 and the circuit board assembly 12, and when the protection member 114 cuts off the connection between the first tab 1112 and the circuit board assembly 12 during overcurrent, the charging circuit is cut off, so that the battery cannot be charged continuously, thereby ensuring that the battery is in a safe state.

In another embodiment, referring to fig. 3 to 4, the battery cell 11 includes a first junction 115 disposed outside the casing 112, a first tab 1112 is electrically connected to the first junction 115, an insulator is disposed between the first tab 1112 and the casing 112 to insulate the first tab 1112 from the casing 112, and the first tab 1112 is electrically connected to the first connection terminal 1142 through the first junction 115. The first transition portion 115 is a conductor, and serves as a connection medium between the electrode assembly 111 and the outside. An insulating member is disposed at a connection between the first junction 115 and the casing 112, so that the casing 112 is connected to the internal pole piece of the battery cell 11 in an insulating manner.

In another embodiment, referring to fig. 3-4 and 6, the battery cell 11 includes a first metal sheet 116 connected to the protection member 114 and the first transition portion 115, wherein the first metal sheet 116 is used to conduct current, and the common metal is nickel, copper, aluminum, or the like.

In still another embodiment, referring to fig. 6, the first metal sheet 116 includes a first plate portion 1161 and a second plate portion 1162 which are arranged in a stepped manner, in an assembled state, in a length extending direction of the first tab 1112, the first plate portion 1161 is located between the second plate portion 1162 and the body 1111, the first plate portion 1161 is connected to the protection member 114, and the second plate portion 1162 is electrically connected to the first tab 1112 by connecting the first transfer portion 115. Since the protection member 114 is located in the groove 113, and the first connection terminal 1142 and the second connection terminal 1143 are also located in the groove 113, the first metal sheet 116 is more suitable for the installation environment by setting the first flat plate portion 1161 and the second flat plate portion 1162 to be distributed in a step manner, so that the first metal sheet 116 can be reliably connected with the first transition portion 115 and the protection member 114, and the structure is compact.

In another embodiment, referring to fig. 3 to 5, the battery cell 11 includes a second metal plate 117 connecting the protection member 114 and the circuit board assembly 12, the second metal plate 117 includes a first connection ear 1171 connecting the second connection terminal 1143 and a plate-shaped main body 1172, the plate-shaped main body 1172 is bent from one end of the first connection ear 1171 far away from the first connection terminal 1142 and extends toward the first connection terminal 1142 through a side of the protection member 114 far away from the detection terminal 1141, and one end of the plate-shaped main body 1172 far away from the second connection terminal 1143 is connected to the circuit board assembly 12. Since the protection member 114 is connected in series between the first tab 1112 and the circuit board assembly 12 and the protection member 114 is placed in the groove 113 between the first tab 1112 and the second tab 1113, the installation environment can be adapted by providing the second metal sheet 117 in a bent shape.

Further, referring to fig. 5 and 3, an end of the plate-like body 1172 away from the second connection terminal 1143 includes a second engagement ear 1173, and the plate-like body 1172 is connected to the circuit board assembly 12 via the second engagement ear 1173. The second metal plate 117 is used to conduct current, and is usually made of metal such as nickel, copper, aluminum, etc.

In yet another embodiment, as shown in FIGS. 3 and 5, the second engaging ears 1173 are perpendicular to the tab body 1172. The second engaging ears 1173 engage the first nickel block 121 in the circuit board assembly 12.

In another embodiment, referring to fig. 2-3, the battery cell 11 includes a second adapter 118 connected to the second pole 1113, the second adapter 118 includes a first conductor 1181 connected to the second pole 1113 and a second conductor 1182 connected to the first conductor 1181, and the second conductor 1182 is connected to the circuit board assembly 12.

The first conductor 1181 is a connection medium between the electrode assembly 111 and the outside, and the connection medium includes a metal conductor. First conductor 1181 is connected to second pole ear 1113 within housing 112 and is provided with an insulating material at its connection to housing 112 to insulate housing 112 from the inner pole piece of core 111. The first conductor 1181 is typically a metal such as nickel, copper, or aluminum. Referring to fig. 2 and 3, first conductor 1181 is connected to second nickel brick 122 in circuit board assembly 12 via second conductor 1182.

The second pole 1113, the first conductor 1181, the second conductor 1182 and the second nickel brick 122 can be mechanically and electrically connected through a laser welding process or a resistance welding or soldering mode so as to realize the energy storage and charging and discharging management functions of the battery.

In another embodiment, referring to fig. 1-2, the battery has a circuit board assembly 12 and an even number of battery cells 11, wherein the even number of battery cells 11 are symmetrically distributed along the circuit board assembly 12.

Specifically, referring to fig. 2, 3, and 5, the battery includes four battery cells 11, two battery cells 11 of the four battery cells 11 are disposed on one side of the circuit board assembly 12, and the other two battery cells 11 are disposed on the other opposite side of the circuit board assembly 12.

The circuit board assembly 12 includes a control circuit 123 and a circuit board 125 carrying the control circuit 123, and the battery cells 11 are distributed on two sides of the circuit board assembly 12.

Further, the cover 1122 of the housing 112 is parallel to the circuit board 125.

As shown in fig. 2, fig. 3, and fig. 5, the circuit board 125 is disposed parallel to the cover 1122, and in this embodiment, the circuit board 125 is disposed parallel to two planes of the battery cell 11 opposite to each other in the thickness direction. In the assembled state, the second engaging lug 1173 is parallel to the circuit board 125 and is soldered to the second nickel bricks 122 distributed on the circuit board 125; the end of the second conductor 1182 remote from the first conductor 1181 is also arranged parallel to the circuit board 125 and soldered to the first nickel bricks 121 distributed on the circuit board 125. Similarly, other cells 11 are also connected to the circuit board assembly 12 in such a manner, so as to form a flat battery core unit 100 suitable for electronic equipment and other devices for implementing the energy storage and charging/discharging management functions of the battery.

In still another embodiment, as shown in fig. 1, the battery includes an insulating fastening unit 200 that covers both the circuit board assembly 12 and the battery cell 11. The insulating fastening unit 200 is used to provide external mounting protection for the battery core unit 100 composed of the circuit board assembly 12 and the battery cell 11.

In yet another embodiment, as shown with reference to fig. 7-8, the insulating fastening unit 200 includes an insulating film 220, the insulating film 220 includes an insulating film base material layer 221, and the insulating film base material layer 221 is bonded to the cell 11 and/or the circuit board assembly 12 through an insulating film bonding layer 222. Among them, the insulating film 220 is mainly used for insulation, printing of a logo, and the like. The insulating film substrate 221 may include any one or more of polyethylene terephthalate (PET). The insulating film adhesive layer 222 may be formed by coating an insulating paste.

In yet another embodiment, referring to fig. 9, the insulation film 220 comprises an insulation film heat conduction layer 223 covering the insulation film base layer 221, the insulation film 220 comprises a plurality of insulation film bonding layers 222, and one of the plurality of insulation film bonding layers 222 is distributed between the insulation film heat conduction layer 223 and the insulation film base layer 221 to fix the insulation film heat conduction layer 223 to the insulation film base layer 221. The insulating heat conductive layer 223 is used for heat equalization and heat dissipation. That is, the insulating film heat conduction layer 223 can not only dissipate heat, but also conduct the heat to other parts of the battery when the battery generates heat locally, so as to prevent local overheating and protect the battery. The insulating heat conducting layer 223 may include any one or more of graphite, copper foil, and aluminum foil.

In still another embodiment, the thickness of the insulating film heat conductive layer 223 may be set to 0.03 to 0.25mm.

In yet another embodiment, the insulating fastening unit 200 further includes a glue-fixing bracket 210 disposed between the insulating film 220 and the battery cell 11 and/or the circuit board assembly 12. The plastic holder 210 is used to form the outline of the battery. The specific position and thickness of the plastic bracket 210 depend on the requirements of the shape. That is, the plastic bracket 210 may completely cover the housing 112, or may partially cover the housing 112, and may have the same thickness or different thicknesses.

A second aspect of the present application provides an electronic device, wherein the battery is disposed in the electronic device. The technical advantages of the electronic device include those of a battery, which are not described in detail herein.

It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. In addition, the "/" in this document generally indicates that the former and latter associated objects are in an "or" relationship, but may also indicate an "and/or" relationship, which may be understood with particular reference to the former and latter text.

In the present application, "at least one" means one or more, "a plurality" means two or more. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c or a-b-c, wherein a, b and c can be single or multiple.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (15)

1. A battery is characterized by comprising at least two battery cells (11), wherein each battery cell (11) comprises an electrode assembly (111), a shell (112) covering the periphery of the electrode assembly (111), and a protection piece (114) with a detection end (1141), and the protection piece (114) is installed on one end face of the shell (112) in a mode that the detection end (1141) points to the electrode assembly (111).

2. The battery according to claim 1, wherein the electrode assembly (111) includes a body (1111) and first and second tabs (1112, 1113) extending outwardly from one end of the body (1111), the case (112) is recessed toward the body (1111) between the first and second tabs (1112, 1113) to form a groove (113), and the protection member (114) is placed in the groove (113).

3. The battery according to claim 2, characterized in that the dimension of the groove (113) in the direction from the first tab (1112) to the second tab (1113) is 3-20 mm and/or the dimension of the groove (113) in the direction of the length extension of the first tab (1112) is 2-5 mm.

4. The battery of claim 2, wherein the protective member (114) comprises a first connection terminal (1142) and a second connection terminal (1143), the first connection terminal (1142) connecting the first tab (1112), the second connection terminal (1143) connecting the circuit board assembly (12).

5. The battery according to claim 4, characterized in that the battery cell (11) comprises a first junction (115) arranged outside the housing (112), the first tab (1112) is electrically connected to the first junction (115), and the first tab (1112) is electrically connected to the first connection terminal (1142) through the first junction (115).

6. The battery according to claim 5, characterized in that the battery cell (11) comprises a first metal sheet (116) connecting the protector (114) and the first transition portion (115), the first metal sheet (116) comprising a first flat plate portion (1161) and a second flat plate portion (1162) in a stepped distribution, the first flat plate portion (1161) being located between the second flat plate portion (1162) and the body (1111);

the first flat plate portion (1161) is connected to the protector (114), and the second flat plate portion (1162) is connected to the first junction portion (115).

7. The battery according to claim 5, wherein the battery cell (11) comprises a second metal sheet (117) connecting the protection member (114) and the circuit board assembly (12), the second metal sheet (117) comprises a first connecting lug (1171) connecting the second connecting terminal (1143) and a sheet-shaped body (1172), and one end of the sheet-shaped body (1172) far away from the second connecting terminal (1143) is connected with the circuit board assembly (12).

8. The battery according to claim 7, wherein an end of the tab body (1172) remote from the second connection terminal (1143) includes a second connection ear (1173), the tab body (1172) being connected to a circuit board assembly (12) via the second connection ear (1173).

9. The battery according to any one of claims 1-8, characterized in that the battery comprises a circuit board assembly (12) and an even number of said cells (11), said even number of cells (11) being symmetrically distributed along said circuit board assembly (12).

10. The battery according to claim 9, wherein the circuit board assembly (12) comprises a control circuit (123) and a circuit board (125) carrying the control circuit (123), and an even number of the cells (11) are distributed on both sides of the circuit board assembly (12).

11. The battery according to claim 9, characterized in that it comprises an insulating fastening unit (200) encasing the electric core (11) and the circuit board assembly (12).

12. The battery according to claim 11, characterized in that the insulating fastening unit (200) comprises an insulating film (220), the insulating film (220) comprising an insulating film substrate layer (221), the insulating film substrate layer (221) bonding the cell (11) and/or the circuit board assembly (12) by an insulating film bonding layer (222).

13. The cell of claim 12, wherein the insulating film (220) comprises an insulating film heat conducting layer (223) encapsulating the insulating film base material layer (221), the insulating film (220) comprising a plurality of insulating film bonding layers (222), one of the plurality of insulating film bonding layers (222) being disposed between the insulating film heat conducting layer (223) and the insulating film base material layer (221).

14. The battery according to claim 12 or 13, characterized in that the insulating fastening unit (200) further comprises a glue fixation bracket (210) arranged between the insulating film (220) and the circuit board assembly (12) and/or the battery cell (11).

15. An electronic device, characterized in that a battery according to any one of claims 1-14 is provided in the electronic device.

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