Insulating film, battery cell, battery and electric equipment

Abstract

The utility model relates to an insulating film, a battery cell, a battery and electric equipment, the insulating film is used for coating a pole core, the end part of the insulating film is provided with a first connecting structure, and the first connecting structure is used for being connected with a space ring of the pole core. According to the technical scheme, after the pole core is coated with the insulating film, the insulating film can be fixedly connected with the space ring through the first connecting structure, and the space ring can play a role in fixing the insulating film. Meanwhile, when the two ends of the insulating film are respectively provided with the first connecting structures and are respectively connected with the space rings at the two ends of the pole core, the insulating film fixedly connected by the space rings can be bound on the pole core, and the pole core is further fixed. Therefore, compared with the prior art, the battery does not need to be additionally provided with a side plate for fixing the pole core, and the original space for installing the side plate is saved, so that the volume of the battery is favorably saved, and the preparation process of the battery is simplified.

Description

Technical Field

[0001] The present disclosure relates to the field of batteries, and more particularly, to an insulating film, an electric core, a battery, and an electrical device. Background Art

[0002] When an electric core is assembled with a housing to form a battery, in order to prevent the electrode core in the electric core from contacting the housing and causing a short circuit, an insulating film is usually coated on the electrode core formed by stacking a plurality of electrode sheets. In order to fix the electrode core, in the battery, a side plate is further required to be disposed outside the insulating film to press the electrode core, but this will increase the volume of the battery and make the preparation of the battery more cumbersome. Summary of the Utility Model

[0003] The purpose of the present disclosure is to provide an insulating film, an electric core, a battery, and an electrical device to solve the problem that the existing battery in the related art requires an additional side plate during the manufacturing process, resulting in cumbersome preparation.

[0004] The first purpose of the present disclosure is to provide an insulating film for coating on an electrode core. A first connection structure is provided at an end of the insulating film, and the first connection structure is used to connect with a spacer of the electrode core.

[0005] Optionally, the first connection structure is a first fixing hole opened at the end of the insulating film, or the first connection structure is a first fixing member provided at the end of the insulating film.

[0006] Optionally, a plurality of first bonding points are provided at the end of the insulating film, and the first bonding points are used to connect the insulating film with the spacer.

[0007] Optionally, in the width direction of the insulating film, the insulating film includes a first part, a second part, a third part, a fourth part, and a fifth part arranged in sequence, wherein

[0008] The first part and the fifth part are used to coat one side of the electrode core, and the first part and the fifth part can at least partially overlap and connect with each other;

[0009] The second part and the fourth part are respectively used to coat the top surface and the bottom surface of the electrode core;

[0010] The third part is used to coat the other side of the electrode core.

[0011] Optionally, a plurality of second bonding points are provided on the surface of the first part, and the plurality of second bonding points are spaced apart in the width direction of the insulating film for connecting the first part with the fifth part.

[0012] Optionally, the first connection structure is respectively disposed on the second part and the fourth part.

[0013] Optionally, on the second part and / or the fourth part, a plurality of overflow holes are formed and arranged at intervals along the length direction of the insulating film.

[0014] The second object of the present disclosure is to provide an electric core, including a pole core, a spacer, and the insulating film according to any one of the above, wherein the spacer is disposed at both ends of the pole core, and a second connection structure capable of cooperating with the first connection structure is disposed on the spacer.

[0015] Optionally, the second connection structure is a second fixing hole formed on the spacer, or the second connection structure is a second fixing member disposed on the spacer.

[0016] The third object of the present disclosure is to provide a battery, including the electric core according to any one of the above.

[0017] The fourth object of the present disclosure is to provide an electrical device, including the battery described above.

[0018] Through the above technical solutions, when the insulating film is coated on the pole core, the insulating film provided by the present disclosure can be fixedly connected to the spacer through the first connection structure, and the spacer can play a role in fixing the insulating film. At the same time, when the first connection structures are respectively disposed at both ends of the insulating film and are respectively connected to the spacers at both ends of the pole core, that is, the spacers at both ends of the pole core are also indirectly connected together through the insulating film. In this way, under the connection of the insulating film, the two spacers are more stable, and the effect of clamping the pole core by the spacers at both ends of the pole core to fix the pole core is enhanced. The insulating film fixedly connected by the spacer can be bound on the pole core to further fix the pole core. In this way, different from the related art, the battery no longer needs to additionally install a side plate for fixing the pole core, and since the space for originally installing the side plate is saved, it is beneficial to save the volume of the battery and simplify the manufacturing process of the battery.

[0019] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification, and are used to explain the present disclosure together with the following specific implementation manners, but do not constitute a limitation to the present disclosure. In the drawings:

[0021] Figure 1 is a schematic structural diagram of the insulating film provided by an exemplary embodiment of the present disclosure;

[0022] Figure 2 is a schematic structural diagram of the electric core provided by an exemplary embodiment of the present disclosure;

[0023] Figure 3 is Figure 2 An enlarged view of part A in

[0024] Figure 4 A schematic diagram showing the use of the insulating film provided by an exemplary embodiment of the present disclosure;

[0025] Figure 5 is Figure 4 An enlarged view of part B in

[0026] Figure 6 is Figure 4 An enlarged view of part B in, where the first part and the second part are in an unconnected state;

[0027] Figure 7 A schematic structural diagram of the spacer provided by an exemplary embodiment of the present disclosure.

[0028] Description of reference numerals

[0029] 1 - Insulating film, 11 - First connection structure, 111 - First fixing hole, 12 - First bonding point, 13 - First part, 14 - Second part, 15 - Third part, 16 - Fourth part, 17 - Fifth part, 18 - Second bonding point, 19 - Overflow hole, 2 - Spacer, 21 - Second connection structure, 211 - Second fixing member. Detailed implementation manners

[0030] The following will describe in detail the specific implementation manners of the present disclosure with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only for the purpose of illustration and explanation of the present disclosure, and are not used to limit the present disclosure.

[0031] In the present disclosure, unless otherwise stated, the orientation terms used usually refer to the orientation of the relevant components in the actual use state. "Inside and outside" can refer to the inside and outside of the contour of the corresponding component or its location inside or outside the environment in which it is located according to the specific context. In addition, when the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The terms "first", "second", etc. used in the present disclosure are used to distinguish one element from another, and do not have an order or importance.

[0032] The blade battery is a single lithium iron phosphate battery in the shape of a long and thin blade. Due to its excellent performance, it has been widely used in new energy electric vehicles. In the blade battery, it usually includes a battery housing and battery cells arranged in the housing. The battery cells are usually composed of a pole core formed by stacking multiple pole pieces. Pole tabs are formed at both ends of the pole core. The spacer 2 is arranged on the pole tabs at both ends of the pole core. The spacer 2 isolates the pole tabs from the battery housing to prevent the pole tabs from contacting the battery housing and causing a short circuit in the blade battery. At the same time, the spacer 2 can also clamp the pole core from both ends of the pole core to fix the pole core.

[0033] In order to prevent the pole core from contacting the battery housing and causing a short circuit in the blade battery, an insulating film 1 also needs to be provided in the blade battery. The insulating film 1 is coated on the pole core. Taking the blade battery as an example, the blade battery is usually rectangular, and the pole core is also usually rectangular. The insulating film 1 is coated on the rectangular pole core, and both ends of the pole core are isolated from the battery housing by the spacer 2.

[0034] In order to fix the insulating film 1, in the blade battery, side plates also need to be provided. The side plates are arranged on the insulating film 1 and abut against the insulating film 1 to fix the insulating film 1. At the same time, the force of the side plates abutting against the insulating film 1 can also be transmitted to the pole core to assist in fixing the pole core and prevent the stacked pole pieces from loosening. However, this will increase the volume of the blade battery and make the preparation of the blade battery more cumbersome.

[0035] As Figures 1 to 7 shown, the present disclosure provides an insulating film 1. The insulating film 1 is used to be coated on the pole core. First connection structures 11 are respectively arranged at the end portions of the insulating film 1. The first connection structures 11 are used to connect with the spacers 2 of the pole core.

[0036] Through the above technical solution, after the insulating film 1 is coated on the pole core, the insulating film 1 provided by the present disclosure can be fixedly connected to the spacer 2 through the first connection structure 11, and the spacer 2 plays a role in fixing the insulating film 1. At the same time, when the first connection structures 11 are respectively arranged at both ends of the insulating film 1 and are respectively connected to the spacers 2 at both ends of the pole core, that is, the spacers 2 at both ends of the pole core are also indirectly connected together through the insulating film 1. In this way, under the connection of the insulating film 1, the two spacers 2 are more stable, and the effect of the spacer 2 clamping the pole core from both ends of the pole core to fix the pole core is enhanced. The insulating film 1 fixedly connected by the spacer 2 can be bound on the pole core to further fix the pole core. In this way, different from the related art, the battery no longer needs to additionally install side plates for fixing the pole core, and since the space for originally installing the side plates is saved, it is beneficial to save the volume of the battery and simplify the battery preparation process.

[0037] Generally speaking, the insulating film 1 is usually made of a thermoplastic polymer material and has a certain elasticity. When the insulating film 1 is applied to the battery cell, the insulating film 1 with a certain elasticity is fixedly connected to the spacer 2 through the first connection structure 11. When the spacer 2 pulls the insulating film 1 through the first connection structure 11, the insulating film 1 will be in a taut state, so that the insulating film 1 can directly fit on the electrode core after covering the electrode core, play a binding role on the electrode core, play a fixing role on the electrode core, and prevent the electrode plates stacked in the electrode core from loosening.

[0038] The elastic force generated on the insulating film 1 in the taut state will also be applied to the spacer 2, increasing the force of the spacer 2 for clamping the electrode core, making the spacers 2 at both ends of the electrode core more stable, so as to strengthen the effect of the spacer 2 for fixing the electrode core.

[0039] In some embodiments, the first connection structure 11 may be a first fixing hole 111 opened at the end of the insulating film 1. Correspondingly, a protruding structure may be provided on the spacer 2, and the protruding structure can cooperate with the first fixing hole 111 to connect the insulating film 1 and the spacer 2. For example, the first fixing hole 111 can be sleeved on the protruding structure, so that the hole wall of the first fixing hole 111 and the outer periphery of the protruding structure are in contact with each other, connecting the insulating film 1 and the spacer 2 through the first connection structure 11. In other embodiments, the first connection structure 11 may be a first fixing member provided at the end of the insulating film 1. Here, the first fixing member refers to a protruding structure provided on the insulating film 1. Correspondingly, a notch may be provided on the spacer 2, and the notch can cooperate with the first fixing member to connect the insulating film 1 and the spacer 2.

[0040] Multiple first bonding points 12 may be respectively provided at the ends of the insulating film 1, and the first bonding points 12 are used to connect the insulating film 1 and the spacer 2. Refer to Figures 2 to 5 When the insulating film 1 is applied to the battery cell, a plurality of first bonding points 12 are provided at the end of the insulating film 1 in the length direction of the electrode core. In this way, the relative positions of the insulating film 1 and the spacer 2 are fixed by the first bonding points 12, and the position of the insulating film 1 relative to the spacer 2 will not change, and it also avoids damage caused by local over-tightening of the insulating film 1 due to the displacement of the insulating film 1. Further, the first bonding points 12 can be used to connect the insulating film 1 to the spacer 2 and the electrode core respectively. In this way, the relative positions of the insulating film 1, the spacer 2 and the electrode core are fixed by the first bonding points 12, and the position of the insulating film 1 relative to the spacer 2 and the electrode core will not change, and it also avoids damage caused by local over-tightening of the insulating film 1 due to the displacement of the insulating film 1. In the battery cell, the insulating film 1, the spacer 2 and the electrode core are connected to each other through the first bonding points 12, and the connected structure is used as a whole, making the battery cell more stable.

[0041] Taking the blade battery as an example, the blade battery is usually rectangular. The electrode core of the blade battery usually has two opposite sides, as well as opposite top and bottom surfaces. In the width direction of the insulating film 1, the insulating film 1 may include a first portion 13, a second portion 14, a third portion 15, a fourth portion 16, and a fifth portion 17 arranged in sequence. Among them, the first portion 13 and the fifth portion 17 are used to cover one side of the electrode core, and the first portion 13 and the fifth portion 17 can at least partially overlap and connect with each other; the second portion 14 and the fourth portion 16 are respectively used to cover the top and bottom surfaces of the electrode core; the third portion 15 is used to cover the other side of the electrode core. The extending direction of the insulating film 1 is the same as the extending direction of the electrode core, that is, the length direction of the insulating film 1 is the same as the length direction of the electrode core. The ends of the insulating film 1 mentioned above are also the two ends of the insulating film 1 in the length direction. In Figure 1 In it, the left-right direction of the drawing surface is the extending direction of the insulating film 1 and the length direction of the insulating film 1. The extending direction of the insulating film 1 and the length direction of the insulating film 1 are represented by the second direction in Figure 1 , Figure 2 and Figure 4 . The insulating film 1 has a sufficient length in the second direction to ensure the effect of preventing the electrode core from contacting the battery housing. At the same time, the insulating film 1 also needs to cover the electrode core, that is, the insulating film 1 also needs to cover the side of the electrode core. At this time, the insulating film 1 also needs to have a sufficient width. In Figure 1 , the width direction of the insulating film 1 is represented by the first direction. The first direction is orthogonal to the second direction. The width of the insulating film 1 has a sufficient size to ensure that the insulating film 1 can cover the electrode core and ensure the effect of preventing the electrode core from contacting the battery housing. In this way, the insulating film 1 can cover the side of the electrode core through the first portion 13, the second portion 14, the third portion 15, the fourth portion 16, and the fifth portion 17. At the same time, the first portion 13 and the fifth portion 17 arranged on the same side of the electrode core can overlap and connect with each other, which can prevent the insulating film 1 from spreading and failing during use. At the same time, the overlapping of the first portion 13 and the fifth portion 17 also ensures the connection area and the connection strength between the first portion 13 and the fifth portion 17.

[0042] Continuing to take the blade battery as an example, the blade battery has requirements for the battery thickness. Taking the application of the insulating film 1 in the electrode core of the blade battery as an example, when the first connection structure 11 is provided on the insulating film 1, the influence on the thickness of the blade battery needs to be avoided. Referring to Figure 2 and Figure 3 and taking the drawing direction of Figure 2 as an example, in Figure 2In this case, the blade battery is vertically arranged. At this time, the second part 14 and the fourth part 16 are respectively arranged on the top surface and the bottom surface of the electrode core. When the first connection structure 11 is arranged on the second part 14 and the fourth part 16, the first connection structure 11 only affects the size of the blade battery in the up and down direction, that is, the first connection structure 11 affects the width of the blade battery and does not affect the thickness of the battery. When the insulating film 1 is applied to other batteries, the two ends of the first part 13, the second part 14, the third part 15, the fourth part 16 and the fifth part 17, that is, the two ends of the insulating film 1, can be respectively provided with the first connection structure 11 to increase the contact area between the insulating film 1 and the spacer 2.

[0043] A plurality of second bonding points 18 can be arranged on the surface of the first part 13. The plurality of second bonding points 18 are arranged at intervals along the width direction of the insulating film 1 and are used to connect the first part 13 and the fifth part 17. The first part 13 and the fifth part 17 are fixed through the second bonding points 18. The high-strength bonding helps to ensure that the insulating film 1 remains stable during long-term use and is not easily caused by reasons such as material aging, environmental changes, and mechanical vibrations. Connection failure, extending the service life of the insulating film 1.

[0044] The above-mentioned first bonding points 12 and second bonding points 18 can have various implementation manners. Taking the first bonding point 12 as an example, in some implementation manners, the first bonding point 12 can be composed of an adhesive, that is, the insulating film 1, the spacer 2 and the electrode core are bonded to each other through the adhesive. In addition, in some other implementation manners, taking the second bonding point 18 as an example, the second bonding point 18 can be formed by melting the first part 13 and the fifth part 17. The insulating film 1 is usually made of a non-metallic insulating plastic material. At high temperatures, the insulating film 1 will melt and have viscosity. At this time, through processes such as laser or soldering iron, the first part 13 and the fifth part 17 can be locally melted, and the melted parts are fused with each other and form the second bonding point 18 after cooling to connect the first part 13 and the fifth part 17 to each other.

[0045] The electrolyte is a liquid medium used in the battery and plays the role of electrochemical reaction and conduction. Therefore, in the battery, the electrode core should be immersed in the electrolyte. In order to prevent the insulating film 1 coated on the electrode core from affecting the flow of the electrolyte, an overflow hole 19 can be arranged on the insulating film 1. The overflow hole 19 enables the electrolyte in the shell to penetrate and infiltrate into the electrode core, so that the electrode core can be completely immersed in the electrolyte. It should be noted that in this application, the overflow hole 19 needs to be opened at a position where the electrode core does not contact the shell. Prevent the electrode core from contacting the shell and causing a short circuit.

[0046] Taking the application of the insulating film 1 to the electrode core of the blade battery as an example, in Figure 2 this case, the blade battery is vertically arranged, and the electrode core is formed by stacking a plurality of electrode sheets. Figure 2The left - right direction therein is the stacking direction of the electrode plates. At this time, on the second part 14 and / or the fourth part 16, a plurality of overflow holes 19 arranged at intervals along the length direction of the insulating film 1 can be provided. The overflow holes 19 are used to ensure the flow of the electrolyte. The overflow holes 19 can be provided between two adjacent electrode plates on the second part 14 and the fourth part 16, so that the overflow holes 19 can avoid the electrode plates and prevent the pole core from contacting the housing and causing a short circuit.

[0047] The second object of the present disclosure is to provide an electric core, which includes a pole core, a spacer 2, and the insulating film 1 of any one of the above, and has all its beneficial effects, which will not be elaborated here. Among them, the spacer 2 is arranged at both ends of the pole core, and a second connection structure 21 capable of cooperating with the first connection structure 11 is arranged on the spacer 2.

[0048] In some embodiments, the second connection structure 21 can be a second fixing hole opened on the spacer 2. Correspondingly, the first connection structure 11 can be the first fixing member arranged at the end of the insulating film 1 mentioned above. In other embodiments, the second connection structure 21 can be a second fixing member 211 arranged on the spacer 2. Specifically, reference can be made to Figure 7 , in Figure 7 , the second fixing member 211 can be configured as a protruding structure arranged on the spacer 2. Correspondingly, the first connection structure 11 can be the first fixing hole 111 opened at the end of the insulating film 1 mentioned above. The first fixing hole 111 can be sleeved on the protruding structure, so that the inner wall of the first fixing hole 111 and the outer periphery of the protruding structure are in contact with each other, enabling the insulating film 1 to be connected to the spacer 2 through the first connection structure 11. The end of the protruding structure can have a slightly larger size, so that after the first fixing hole 111 is sleeved on the protruding structure, the end of the protruding structure can play a limiting role on the insulating film 1 to prevent the insulating film 1 from detaching from the protruding structure. In addition, when the installation space and manufacturing process are suitable, the first connection structure 11 and the second connection structure 21 can also adopt other detachable connection structures such as snap - fit connection. For example, the first connection structure 11 can be a snap - fastener, and the second connection structure 21 can be a snap - fastener, and the connection between the insulating film 1 and the spacer 2 is realized through the snap - fastener and the card slot.

[0049] The third object of the present disclosure is to provide a battery, which includes the electric core of any one of the above embodiments and has all its beneficial effects, which will not be elaborated here.

[0050] The fourth object of the present disclosure is to provide an electrical device, which includes the above - mentioned battery and has all its beneficial effects, which will not be elaborated here.

[0051] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0052] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination manners.

[0053] Furthermore, any combination can be made among various different embodiments of the present disclosure as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. An insulating film, characterized in that, A battery cell applicable to a blade battery, the insulating film is used to wrap the electrode core, and a first connection structure is provided at the end of the insulating film, and the first connection structure is used to connect with the spacer of the electrode core.

2. The insulating film according to claim 1, wherein The first connection structure is a first fixing hole opened at the end of the insulating film, or the first connection structure is a first fixing member provided at the end of the insulating film.

3. The insulating film according to claim 1, characterized in that, A plurality of first bonding points are further provided at the end of the insulating film, and the first bonding points are used to connect the insulating film to the spacer.

4. The insulating film according to claim 1, wherein In the width direction of the insulating film, the insulating film includes a first part, a second part, a third part, a fourth part, and a fifth part arranged in sequence, wherein, The first part and the fifth part are used to wrap on one side of the electrode core, and the first part and the fifth part can at least partially overlap and connect with each other; The second part and the fourth part are respectively used to wrap on the top surface and the bottom surface of the electrode core; The third part is used to wrap on the other side of the electrode core.

5. The insulating film according to claim 4, wherein A plurality of second bonding points are provided on the surface of the first part, and the plurality of second bonding points are spaced along the width direction of the insulating film, and are used to connect the first part and the fifth part.

6. The insulating film according to claim 4, wherein The first connection structure is respectively provided on the second part and the fourth part.

7. The insulating film according to claim 4, wherein On the second part and / or the fourth part, a plurality of overflow holes are opened and arranged at intervals along the length direction of the insulating film.

8. A battery cell, characterized in that, It includes an electrode core, a spacer, and the insulating film according to any one of claims 1-7, the spacer is arranged at both ends of the electrode core, wherein, a second connection structure capable of cooperating with the first connection structure is provided on the spacer.

9. The battery cell according to claim 8, characterized in that, The second connection structure is a second fixing hole opened on the spacer, or the second connection structure is a second fixing member provided on the spacer.

10. A battery, characterized in that, It includes the battery cell according to claim 8 or 9.

11. An electrical device, characterized in that, It includes the battery according to claim 10.

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