阅读说明：本技术 电池、电池组及电子装置 (Battery, battery pack, and electronic device ) 是由 姚明高 于 2021-01-18 设计创作，主要内容包括：一种电池,包括电芯和印刷电路板。所述印刷电路板设置于所述电芯的头部且电连接于所述电芯。所述电池还包括注塑体,所述注塑体包括第一注塑部和第二注塑部,所述第一注塑部覆盖所述印刷电路板,所述第二注塑部覆盖所述第一注塑部的至少一侧。所述第一注塑部的密度为ρ-1,所述第二注塑部的密度为ρ-2,ρ-1<ρ-2。本申请还提供一种具有上述电池的电池组和电子装置。本申请能够减小电池的总重量。(A battery includes a cell and a printed circuit board. The printed circuit board is arranged at the head of the battery cell and electrically connected with the battery cell. The battery further comprises an injection molding body, wherein the injection molding body comprises a first injection molding part and a second injection molding part, the first injection molding part covers the printed circuit board, and the second injection molding part covers at least one side of the first injection molding part. The density of the first injection molding part is rho 1 The density of the second injection molding part is rho 2 ，ρ 1 <ρ 2 . The application also provides a battery pack and an electronic device with the battery. The application can reduce electricityThe total weight of the cell.)

1. A battery, comprising an electric core and a printed circuit board, wherein the printed circuit board is arranged at the head of the electric core and is electrically connected with the electric core,

the battery also comprises an injection molding body, wherein the injection molding body comprises a first injection molding part and a second injection molding part, the first injection molding part covers the printed circuit board, and the second injection molding part covers at least one side of the first injection molding part;

the density of the first injection molding part is rho₁The density of the second injection molding part is rho₂，ρ₁<ρ₂。

2. The battery of claim 1, wherein the first injection molded part has a hardness of H₁The hardness of the second injection molding part is H₂，H₁<H₂。

3. The battery of claim 2, wherein the first injection molded part comprises at least one of foam, silicone, and rubber, and the second injection molded part comprises at least one of polyurethane, nylon, and polyethylene terephthalate.

4. The battery of claim 2, wherein the first injection molded part has a glass transition temperature Tg₁The glass transition temperature of the second injection molding part is Tg₂，Tg₁<Tg₂。

5. The battery of claim 4, wherein Tg is₁<150 degrees.

6. The battery of claim 1, wherein p₁<1g/mm³，ρ₂≥1g/mm³。

7. The battery of claim 1, wherein the first injection-molded part comprises a first bottom surface, a first top surface, two first side surfaces and two second side surfaces, the first bottom surface faces the battery core, the first top surface is opposite to the first bottom surface, the first side surface and the second side surface are both connected between the first bottom surface and the first top surface, the first side surface is connected to the second side surface, and the extending direction of the first side surface is the same as the length direction of the printed circuit board.

8. The battery of claim 7, wherein the second overmold covers the first top surface, the first side surface, and the second side surface.

9. The battery of claim 7, wherein the second overmold covers the first side, the first top surface and the second side surface being exposed to the second overmold.

10. The battery of claim 7, wherein the second overmold covers the second side, and the first top surface and the first side surface are exposed to the second overmold.

11. The battery of claim 1, wherein the cell comprises a housing, an electrode assembly housed in the housing, and tabs electrically connected to the electrode assembly, the tabs extending out of the housing and electrically connected to the printed circuit board, the first molded portion further covering the tabs.

12. The battery of claim 11, wherein the case includes a case body for receiving the electrode assembly and a top seal connected to the case body, the case body including a second top surface, the top seal connected to the second top surface, the tab extending from the top seal, the first injection molded part further covering the top seal and the second top surface.

13. The battery of claim 12, wherein the housing further comprises a side seal coupled to the housing body, the housing body further comprising a second bottom surface, an upper surface, a lower surface, and a third side surface, the second bottom surface being opposite the second top surface, the upper surface being opposite the lower surface, the side seal being disposed on the third side surface, the first and/or second overmold further covering at least one of the second bottom surface, the side seal, the upper surface, and the lower surface.

14. The battery of any of claims 1-13, further comprising a flexible circuit board electrically connected to the printed circuit board and extending out of the injection molded body.

15. The battery of claim 14, wherein the second injection-molded part is provided with a groove, the flexible circuit board comprises a first board part, a bent part and a second board part which are sequentially connected, the first board part is electrically connected to the printed circuit board and is located in the first injection-molded part, the bent part extends out of the first injection-molded part and is located in the groove, and the second board part extends out of the second injection-molded part.

16. A battery comprising a plurality of cells according to any one of claims 1 to 15, arranged side by side or stacked.

17. The battery of claim 16 wherein said first overmold of all of said cells is integrally formed and said second overmold of all of said cells is integrally formed.

18. An electronic device characterized in that the electronic device comprises the battery according to any one of claims 1 to 15.

Technical Field

The present disclosure relates to battery technologies, and particularly to a battery, a battery pack having the same, and an electronic device having the same.

Background

With the development of battery technology, batteries are widely used in electronic devices such as electronic mobile devices, electric tools, and electric vehicles. When the battery is subjected to mechanical abuse (such as collision, extrusion, falling and the like) in the use process, the protection plate at the head of the battery is easily subjected to external impact to cause failure. Therefore, it is often necessary to wrap an insulating tape or an injection molding frame around the battery head.

However, the insulating tape needs to be cut according to the surface shape of the protection board, so that the production efficiency is low, the bonding strength of the insulating tape is limited, and the reliability is poor. The frame of gluing of moulding plastics can fully laminate with the protection shield surface, and improve with the bonding reliability between the protection shield, nevertheless glues the total weight that the frame can show the increase battery, and the increase of weight has not only restricted the range of application of battery, reduces user experience moreover.

Disclosure of Invention

In order to overcome the above disadvantages in the prior art, it is necessary to provide a battery.

In addition, it is also necessary to provide a battery pack and an electronic device having the battery.

The application provides a battery, including electric core and printed circuit board. The printed circuit board is arranged at the head of the battery cell and electrically connected with the battery cell. The battery further comprises an injection molding body, wherein the injection molding body comprises a first injection molding part and a second injection molding part, the first injection molding part covers the printed circuit board, and the second injection molding part covers at least one side of the first injection molding part. The density of the first injection molding part is rho₁The density of the second injection molding part is rho₂，ρ₁<ρ₂. The application sets up the injection molding body and includes that the density is different first portion of moulding plastics and the second portion of moulding plastics. The density of the first injection molded part for covering the printed circuit board is relatively small, and thus the weight of the first injection molded part is also relatively small. Therefore, the first injection molding part is beneficial to reducing the weight of the injection molding body, so that the total weight of the battery is reduced, and the battery can adapt to the development trend of light weight of an electronic device.

In some possible implementations, the first injection molded part has a hardness of H₁The hardness of the second injection molding part is H₂，H₁<H₂. Therefore, when the battery receives mechanical abuse, the first injection molding part with high flexibility can play a certain buffering role, so that the external impact on the printed circuit board is reduced, the problem of battery core failure is avoided, and the falling resistance and the safety of the battery are improved.

In some possible implementations, the first injection molded part includes at least one of foam, silicone, and rubber, and the second injection molded part includes at least one of polyurethane, nylon, and polyethylene terephthalate.

In some possible implementations, the first shot has a glass transition temperature Tg₁The glass transition temperature of the second injection molding part is Tg₂，Tg₁<Tg₂. Therefore, in the injection molding process of the injection molded body, the edge of the first injection molding part and the second injection molding part can be fused into a whole, the occurrence of the mutual separation of the first injection molding part and the second injection molding part is reduced, the bonding strength between the first injection molding part and the second injection molding part is improved, and the falling resistance and the safety of the battery are further improved.

In some possible implementations, Tg₁<150 degrees.

In some possible implementations, ρ₁<1g/mm³，ρ₂≥1g/mm³。

In some possible implementations, the first injection molded part includes a first bottom surface, a first top surface, two first side surfaces, and two second side surfaces. The first bottom surface faces the battery cell, and the first top surface and the first bottom surface are arranged in a back-to-back mode. The first side surface and the second side surface are both connected between the first bottom surface and the first top surface. The first side surface is connected with the second side surface, and the extending direction of the first side surface is the same as the length direction of the printed circuit board.

In some possible implementations, the second injection molded part covers the first top surface, the first side surface, and the second side surface.

In some possible implementations, the second molding covers the first side. The first top surface and the second side surface are exposed to the second injection molding part.

In some possible implementations, the second injection molded part covers the second side surface. The first top surface and the first side surface are exposed to the second injection molding part.

In some possible implementations, the battery cell includes a casing, an electrode assembly housed in the casing, and a tab electrically connected to the electrode assembly. The tabs extend out of the housing and are electrically connected to the printed circuit board. The first injection molding part also covers the lug. Therefore, when the battery is subjected to mechanical abuse, the first injection molding part can also protect the lug, and the falling resistance and the safety of the battery are further improved.

In some possible implementations, the case includes a case body for receiving the electrode assembly and a top sealing edge connected to the case body. The shell body comprises a second top surface, and the top sealing edge is connected with the second top surface. The tab extends out of the top seal edge. The first injection molding part also covers the top sealing edge and the second top surface. Therefore, when the battery is abused by machines, the first injection molding part can also protect the head of the battery core, the risks of top edge sealing damage and battery leakage are reduced, and the falling resistance and the safety of the battery are further improved.

In some possible implementations, the enclosure further includes a side seal joining the enclosure body. The housing body further includes a second bottom surface, an upper surface, a lower surface, and a third side surface. The second bottom surface and the second top surface are arranged in a back-to-back manner, the upper surface and the lower surface are arranged in a back-to-back manner, and the side sealing edge is arranged on the third side surface. The first injection molding part and/or the second injection molding part also cover at least one of the second bottom surface, the side seal edge, the upper surface and the lower surface. Therefore, the first injection molding body and/or the second injection molding body can also protect the tail part, the upper surface and the lower surface and the side surface of the battery cell, and the risks of side edge sealing damage and battery leakage are reduced.

In some possible implementations, the battery further includes a flexible circuit board electrically connected to the printed circuit board and extending out of the injection molded body. The flexible circuit board is used for electrically connecting the battery cell with an external element.

In some possible implementation manners, the second injection molding part is provided with a groove, the flexible circuit board comprises a first board part, a bending part and a second board part which are sequentially connected, the first board part is electrically connected to the printed circuit board and is located in the first injection molding part, the bending part extends out of the first injection molding part and is located in the groove, and the second board part extends out of the second injection molding part.

The present application also provides a battery pack comprising a plurality of cells as described above, a plurality of the cells being arranged side-by-side or stacked.

In some possible implementations, the first injection-molded parts of all the batteries are integrally molded, and the second injection-molded parts of all the batteries are integrally molded, so that the manufacturing process can be simplified, and the manufacturing cost of the battery pack can be reduced.

The application also provides an electronic device comprising the battery.

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 view of the battery shown in fig. 1 with the second injection molded part removed.

Fig. 3 is an exploded view of the battery shown in fig. 1.

Fig. 4 is a cross-sectional view along IV-IV of the battery shown in fig. 1.

Fig. 5 is a schematic structural diagram of a battery according to another embodiment of the present disclosure.

Fig. 6 is a schematic structural diagram of a battery according to still another embodiment of the present disclosure.

Fig. 7 is a schematic structural diagram of a battery pack according to an embodiment of the present application.

Fig. 8 is a schematic structural diagram of a battery pack according to another embodiment of the present application.

Fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Description of the main element symbols:

a battery pack-1; an electronic device-2; a battery core-10; a housing-11; a tab-12; a printed circuit board-20; -21 an electrical connector; injection molding body-30; a first injection molding part-31; a second injection-molded part-32; a flexible circuit board-40; a first plate portion-41; a second plate portion-42; a bent portion-43; batteries-100, 200, 300; a housing body-110; top edge sealing-111; side edge sealing-112; a first bottom surface-310; a first top surface-311; a first side-312; a second side-313; a groove-320; a second top surface-1100; a second bottom surface-1101; upper surface-1102; lower surface-1103.

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

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.

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 application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1 to 4, an embodiment of the present invention provides a battery 100 including a battery cell 10, a printed circuit board 20, and an injection molded body 30.

As shown in fig. 3 and 4, the printed circuit board 20 is disposed at the head of the battery cell 10 and electrically connected to the battery cell 10. In some embodiments, the battery cell 10 includes a casing 11, an electrode assembly (not shown) and an electrolyte (not shown) housed in the casing 11, and tabs 12 electrically connected to the electrode assembly. The tab 12 extends out of the housing 11 and is electrically connected to the printed circuit board 20. In some embodiments, an electrical connector 21 (e.g., a nickel plate) may be disposed on the printed circuit board 20, and the printed circuit board 20 is electrically connected to the tab 12 through the electrical connector 21.

As shown in fig. 1 to 4, the injection molded body 30 includes a first injection molded part 31 and a second injection molded part 32. The first injection molding part 31 covers the printed circuit board 20. The second injection part 32 covers the first injection part 31. Wherein the first injection molding part 31 comprises a first bottom surface 310, a first top surface 311, two first side surfaces 312 and two first side surfacesA second side 313. The first bottom face 310 faces the battery cell 10. The first top surface 311 is opposite to the first bottom surface 310, that is, the first top surface 311 is located at the head of the battery cell 10. The first side surface 312 and the second side surface 313 are connected between the first bottom surface 310 and the first top surface 311. The two first sides 312 are opposite, the second side 313 is opposite, and the first side 312 is connected to the second side 313. The extending direction of the first side surface 312 is the same as the length direction of the printed circuit board 20 (here, the length direction of the printed circuit board 20 is the width direction of the battery cell 10). The second injection molded part 32 covers the first top surface 311, the two first side surfaces 312 and the two second side surfaces 313 of the first injection molded part 31, i.e. the second injection molded part 32 serves as an outer layer of the injection molded body 30. The density of the first injection molding part 31 is ρ₁The density of the second injection molding part 32 is rho₂，ρ₁<ρ₂. In some embodiments, ρ₁<1g/mm³，ρ₂≥1g/mm³。

The injection-molded body 30 includes a first injection-molded part 31 and a second injection-molded part 32 having different densities. The density of the first injection molded part 31 for covering the printed circuit board 20 is relatively small, and thus the weight of the first injection molded part 31 is also relatively small. The first injection molding part 31 is beneficial to reducing the weight of the injection molding body 30, and further reducing the total weight of the battery 100, so that the battery 100 can adapt to the development trend of light weight of electronic devices.

In some embodiments, the first injection molded part 31 has a hardness of H₁The hardness of the second injection-molded part 32 is H₂，H₁<H₂. That is, the first injection molded part 31 has high flexibility and the second injection molded part 32 has high hardness. Therefore, when the battery 100 is subjected to mechanical abuse (such as collision, extrusion, falling, etc.), the first injection molding part 31 with relatively high flexibility can play a certain role in buffering, which is beneficial to reducing external impact on the printed circuit board 20 and avoiding the problem of failure of the battery cell 10, thereby improving the falling resistance and safety of the battery 100. Meanwhile, the second injection molding part 32 with higher hardness is used as the outer layer of the injection molding body 30, and the second injection molding part 32 covers the first top surface 311, the first side surface 312 and the second side surface 313 of the first injection molding part 31, so that the second injection molding part 32 can increase injection molding quantityThe overall stiffness of body 30.

In some embodiments, the first injection molded part 31 includes at least one of a foam rubber, a silicone rubber, and a rubber. The second injection molded part 32 includes at least one of polyurethane, nylon, and polyethylene terephthalate.

In some embodiments, the casing 11 may be a packaging bag packaged by an aluminum plastic film, that is, the battery cell 10 may be a soft-package battery cell. At this time, the case 11 includes a case body 110 for accommodating the electrode assembly and the electrolyte, and a top sealing edge 111 and a side sealing edge 112 connected to the case body 110. The tab 12 extends from the top edge 111. As shown in fig. 3 and 4, the surface of the case body 110 connected to the top sealing edge 111 is a second top surface 1100 of the case body 110. The housing body 110 further includes a second bottom 1101, two third sides (not shown), an upper surface 1102 and a lower surface 1103. The second bottom side 1101 is opposite the second top side 1101. The third side is connected between the second bottom 1101 and the second top 1100, and the side sealing edge 112 is disposed on the third side. The upper surface 1102 and the lower surface 1103 are connected between the second bottom surface 1101 and the second top surface 1100, and the upper surface 1102 and the lower surface 1103 are disposed opposite to each other. An accommodating space (not shown) is defined between the top sealing edge 111 and the second top surface 1100 of the housing body 110, and the printed circuit board 20 is disposed in the accommodating space. The first injection molding part 31 may cover the printed circuit board 20, the tab 12, the electrical connector 21, the partial top sealing edge 111, and a partial second top surface 1100 of the case body 110. Therefore, when the battery 100 is abused mechanically, the first injection molding part 31 can reduce external impact on the printed circuit board 20, protect the tab 12, the electrical connector 21 and the head of the battery cell 10, reduce the risk of damage of the top sealing edge 111 and leakage of the battery 100, and further improve the drop resistance and safety of the battery 100. It is understood that the battery cell 10 is not limited to a soft package battery cell, and may also be a steel-clad battery cell or an aluminum-clad battery cell, and the application is not limited thereto.

Taking a soft package cell as an example, in manufacturing, first, an electrode assembly and an electrolyte are packaged in a case 11, the case 11 forms a case body 110 for housing the electrode assembly, and a top seal edge 111 and a side seal edge 112 connected to the case body 110, and a tab 12 is sealed from the topThe edge 111 extends out. The printed circuit board 20 is electrically connected with the tab 12, and the printed circuit board 20 is folded into the receiving space formed by the second top surface 1100 of the housing body 110 and the top sealing edge 111. Then, the injection molded body 30 is formed by step injection molding, that is, a first injection molded part 31 is formed by low pressure injection molding an insulating material on the surface of the printed circuit board 20 and is cured, and a second injection molded part 32 is formed by low pressure injection molding another insulating material on the surface of the first injection molded part 31 and is cured. In some embodiments, the first injection molded part 31 has a glass transition temperature Tg₁The glass transition temperature of the second injection molding part 32 is Tg₂，Tg₁<Tg₂In this way, in the process of forming the second injection molding part 32, the edge of the first injection molding part 31 and the second injection molding part 32 can be fused into a whole, so that the occurrence of the mutual separation of the first injection molding part 31 and the second injection molding part 32 is reduced, the bonding strength between the first injection molding part 31 and the second injection molding part 32 is improved, and the drop resistance and the safety of the battery 100 are further improved. In some embodiments, Tg₁<150 degrees.

In other embodiments, the injection-molded body 30 may be formed in one step, and in this case, the first injection-molded part 31 and the second injection-molded part 32 are formed simultaneously by two-material injection molding or two-color injection molding.

As shown in fig. 3, the first injection molded body 31 and/or the second injection molded body 32 do not cover the second bottom surface 1101, the upper surface 1102, the lower surface 1103 and the side edge seal 112. In other embodiments, the first injection molded body 31 and/or the second injection molded body 32 may also cover at least one of the second bottom surface 1101, the upper surface 1102, the lower surface 1103 and the side edge seal 112. Specifically, the first injection molded body 31 and/or the second injection molded body 32 may cover the entire area of at least one of the second bottom surface 1101, the upper surface 1102, the lower surface 1103 and the side seal 112, or may cover a partial area of at least one of the second bottom surface 1101, the upper surface 1102, the lower surface 1103 and the side seal 112. At this time, the first injection molding body 31 and/or the second injection molding body 32 can also protect the tail, the upper surface, the lower surface and the side surface of the battery cell 10, and also reduce the risks of damage to the side sealing edge 112 and leakage of the battery 100.

As shown in fig. 3, in some embodiments, battery 100 further includes a flexible circuit board 40. The flexible circuit board 40 is electrically connected to the printed circuit board 20 at one end, and extends out of the injection molded body 30 at the other end for electrical connection with an external component (not shown). Further, the flexible circuit board 40 may be provided with a connector (not shown), and the flexible circuit board 40 electrically connects the battery cell 10 with an external element through the connector.

As shown in fig. 3, in some embodiments, the second injection molded part 32 is provided with a groove 320. The flexible circuit board 40 includes a first plate portion 41, a bent portion 43, and a second plate portion 42 connected in this order. The first plate portion 41 is electrically connected to the printed circuit board 20 and is located inside the first injection portion 31. The bent portion 43 extends out of the first injection molding portion 31 and is located in the groove 320. The second plate portion 42 extends beyond the second injection molded portion 32. A connector for connecting an external element is provided to the second plate portion 42.

Referring to fig. 5, another embodiment of the present application further provides a battery 200. The difference from the above-described battery 100 is that the second injection molded part 32 covers only the first side surface 312, and the first top surface 311 and the second side surface 313 are exposed to the second injection molded part 32.

In this case, the object of reducing the weight of the injection-molded body 30 can be achieved, and the battery 200 can be sufficiently protected. On the other hand, in other embodiments, the upper edge of the printed circuit board 20 away from the battery cell 10 may be exposed to the first top surface 311 of the first injection molded body 30, and the exposure of the first top surface 311 to the second injection molded body 30 is also beneficial to heat dissipation of the printed circuit board 20, so as to improve the heat dissipation performance of the battery 200.

Referring to fig. 6, a battery 300 is further provided according to another embodiment of the present disclosure. The difference from the above-described battery 100 is that the second injection molded part 32 covers only the second side surface 313, and the first top surface 311 and the first side surface 312 are exposed to the second injection molded part 32. In this case, the object of reducing the weight of the injection-molded body 30 can be achieved, and the battery 300 can be sufficiently protected. Similarly, the upper edge of the printed circuit board 20 away from the battery cell 10 may be exposed to the first top surface 311 of the first injection molded body 30, and the exposure of the first top surface 311 to the second injection molded body 30 is also beneficial to heat dissipation of the printed circuit board 20, so as to improve the heat dissipation performance of the battery 300.

Referring to fig. 7 and 8, the present application also provides a battery pack 1. The battery pack 1 includes a plurality of batteries 100. Among them, a plurality of batteries 100 may be arranged in the thickness or width direction of the battery cell 10. As shown in fig. 7, a plurality of batteries 100 are arranged in the width direction of the battery cells 10, that is, a plurality of battery cells 10 are arranged side by side. As shown in fig. 8, a plurality of batteries 100 may be arranged in the thickness direction of the battery core 10, i.e., a plurality of batteries 100 may be stacked.

In some embodiments, the first injection-molded parts 31 (not shown in fig. 7 and 8) of all the batteries 100 are integrally molded, and the second injection-molded parts 32 of all the batteries 300 are integrally molded.

During manufacturing, after each cell 10 is encapsulated and connected to the printed circuit board 20 (not shown in fig. 7 and 8), all the cells 10 are arranged in the thickness or width direction, and the injection molded body 30 is formed by step injection molding, specifically: first, the first injection parts 31 of all the batteries 10 are formed at one time, and then the second injection parts 32 of all the batteries 100 are formed at one time by forming another insulating material on the surfaces of the first injection parts 31, so that the battery pack 1 is obtained. Thus, the manufacturing process can be simplified, and the manufacturing cost of the battery pack 1 can be reduced.

In other embodiments, after each battery cell 10 is packaged and connected to the printed circuit board 20, the first injection molding part 31 and the second injection molding part 32 may be formed separately for each battery cell 10 by step injection molding or one-time injection molding to obtain a plurality of batteries 100, and then the plurality of batteries 100 are arranged along the thickness or width direction of the battery cell 10 to obtain the battery pack 1.

It is to be understood that the above description has been made by taking the example in which the battery pack 1 includes a plurality of batteries 100, but it is to be understood that the battery pack 1 may include a plurality of batteries 200 or a plurality of batteries 300, or a combination of at least two of the batteries 100, 200, and 300.

With reference to fig. 3 and 7, when a plurality of battery cells 10 are arranged side by side, the first injection molded body 31 and/or the second injection molded body 32 may further cover at least one of the second bottom 1101, the upper surface 1102, the lower surface 1103 and the outermost side edge sealing 112 of the battery pack 1 of each battery cell 10. In this way, the first injection-molded part 31 and/or the second injection-molded part 32 can also protect the rear and the side of the entire battery pack 1. It is understood that the first injection molded body 31 and/or the second injection molded body 32 may also cover two side edge seals 112 facing each other in two adjacent battery cells 10.

With combined reference to fig. 3 and 8, when a plurality of battery cells 10 are stacked, the first injection-molded body 31 and/or the second injection-molded body 32 may further cover at least one of the second bottom surface 1101, the side sealing edge 112, and the outermost upper surface 1102 and lower surface 1103 of the battery pack 1 of each battery cell 10. It is understood that the first injection molded body 31 and/or the second injection molded body 32 may also cover the upper surface 1102 and the lower surface 1103 of two adjacent battery cells 10 that are facing each other.

Referring to fig. 9, the present application further provides an electronic device 2, where the electronic device 2 includes the battery 100 (or the batteries 200 and 300) as above. In one embodiment, the electronic device 2 of the present invention may be, but is not limited to, a notebook computer, a pen-input computer, a mobile computer, an electronic book player, a cellular phone, a portable facsimile machine, a portable copier, a portable printer, a headphone, a video recorder, a liquid crystal television, a portable cleaner, a portable CD player, a mini-disc, a transceiver, an electronic organizer, a calculator, a memory card, a portable recorder, a radio, a backup power source, a motor, an automobile, a motorcycle, a power-assisted bicycle, a lighting fixture, a toy, a game machine, a clock, an electric power tool, a flashlight, a camera, a large household battery, a lithium ion capacitor, and the like.

Although the present application has been described in detail with reference to preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present application.