CN220604939U - Battery core structure, battery cell, energy storage device and electricity utilization device - Google Patents

Abstract

The present disclosure relates to a battery core structure, a battery cell, an energy storage device and an electrical device. The battery core structure includes an electrode assembly and an insulating tape. The electrode assembly includes a main body and positive and negative electrode tabs located at both ends of the main body. part, the insulating tape surrounds the outer circumferential side of the pole lug part, the insulating tape has an adhesive area and a non-adhesive area, the adhesive area is bonded to the outer circumferential side of at least one of the main body part and the pole lug part, and the non-adhesive area It is located on the side of the bonding area away from the main body, and the boundary line between the non-bonding area and the bonding area is lower than the end surface of the tab part or flush with the end surface of the tab part.

Description

Cell structure, battery cells, energy storage devices and power consumption devices

Technical field

The present disclosure relates to the field of energy storage technology, and specifically, to a battery core structure, a battery cell, an energy storage device, and an electrical device.

Background technique

At present, all-pole lug batteries have become the key development direction of today's power lithium-ion batteries due to their typical advantages such as low internal connection resistance, strong connection reliability, and strong heat dissipation effect. However, in all-pole lug batteries, the two-pole lugs of the battery are easily At the same time, it comes into contact with the aluminum shell, causing the risk of internal shortage of the battery.

Utility model content

A main purpose of the present disclosure is to provide a battery cell structure, battery cells, energy storage devices and power consumption devices that can effectively reduce the risk of short circuits inside the battery.

The present disclosure provides a battery core structure, which includes:

An electrode assembly includes a main body and bipolar ears located at opposite ends of the main body. One of the two polar ears is a positive electrode and the other is a negative electrode;

Insulating tape, the outer peripheral side of at least one of the tab parts is surrounded by the insulating tape.

In the embodiment of the present disclosure, the pole lug part and the casing can be insulated by the insulating tape, thereby preventing the casing from overlapping the two pole lugs at the same time, resulting in the positive and negative poles of the battery cell being connected and causing the battery cell to be short. occur.

The insulating tape has an adhesive area and a non-adhesive area, the adhesive area is adhered to the outer peripheral side of at least one of the main body part and the tab part, and the non-adhesive area is located on the The side of the bonding area away from the main body part, the surface of the non-bonding area away from the bonding area is higher than the end surface of the tab part, and the distance between the non-bonding area and the bonding area The boundary line is lower than the end surface of the pole lug part or flush with the end surface of the pole lug part.

In the embodiment of the present disclosure, the side of the insulating tape away from the main body is protruded from the end surface of the tab portion to prevent the tab portion from directly overlapping the inner wall of the case when the battery cell shakes, causing an internal short circuit. risk.

In addition, the present disclosure also provides the insulating tape with a semi-adhesive structure, that is, the insulating tape is provided with a sticky bonding area and a non-sticky non-adhesive area, and the bonding area is connected to at least one of the main body part and the tab part. The outer peripheral sides of the adhesive tape are bonded to each other so that the insulating tape is fixed on the electrode assembly, and the non-adhesive area is arranged on the side of the adhesive area away from the main body, and the surface of the non-adhesive area away from the adhesive area is higher than the tab part. The end surface of the insulating tape, and the boundary line between the non-bonding area and the bonding area is set lower than the end surface of the pole lug part or flush with the end surface of the pole lug part. That is to say, the part of the insulating tape that is higher than the pole lug part is not In this way, compared with the technical solution in which the insulating tape has an all-glue structure, the part of the insulating tape higher than the pole lug can be prevented from bonding with the end face of the pole lug when subjected to external pressure due to its stickiness, and the When the insulating tape rebounds, it will pick up a small part of the tabs, which reduces the possibility of the tabs overlapping the inner wall of the case, thereby preventing the positive and negative poles of the battery cells from being connected, and reducing the risk of short battery cells.

In one embodiment of the present disclosure, the insulating tape includes an insulating base material and a glue layer. The part of the insulating base material located in the bonding area is provided with the glue layer, and the glue layer is connected to the adhesive layer. At least one of the main body part and the tab part is bonded, and the part of the insulating base material located in the non-adhesive area is not provided with the adhesive layer.

In the embodiment of the present disclosure, the insulating tape with the glue layer is connected to one of the tab part or the main body part, which can ensure the stability of the bonding between the insulating tape and the electrode assembly. At the same time, the insulation is higher than the end surface of the tab part. The tape does not have a glue layer, which can avoid that when the part of the insulating tape higher than the end surface of the pole lug is folded and comes into contact with the pole lug, part of the pole lug will be lifted up due to the rebound of the insulating tape, thus preventing the two pole lugs from being pulled up at the same time. Connected to the shell to reduce the risk of short battery cells.

In one embodiment of the present disclosure, the bonding area is bonded to both the main body part and the outer peripheral side of the tab part. At this time, the bonding area between the insulating tape and the electrode assembly is large. In turn, the adhesion between the insulating tape and the electrode assembly can be enhanced.

In an embodiment of the present disclosure, a boundary line between the non-adhesive area and the adhesive area is flush with an end surface of the tab part.

In the disclosed embodiment, while ensuring the stable adhesion between the insulating tape and the electrode assembly, it also ensures that the part of the insulating tape that is higher than the end surface of the pole lug is not sticky, so as to prevent the insulating tape from being brought up after contact with the pole lug. The pole lugs reduce the possibility of the shell overlapping the two pole lugs at the same time, thereby reducing the risk of short battery cells and extending the service life of the battery cells.

In an embodiment of the present disclosure, the ratio of the height of the non-adhesive area to the height of the tab portion ranges from 1.2 to 2.

In the embodiment of the present disclosure, it can be ensured that the height of the non-adhesive area in the insulating tape is large enough, thereby ensuring that during the process of pasting the insulating tape, the portion of the insulating tape higher than the pole lug is always a non-adhesive area, so as to isolate the The contact between the tabs and the current collector and the case prevents the battery cells from being short. On the other hand, the height of the non-adhesive area in the insulating tape should not be too high, which can reduce the use of insulating base materials. It saves production costs. In addition, it can also avoid the situation where the height of the non-adhesive area is too high, which causes the non-adhesive area to be weak in support and unable to maintain the upright state well. It can further avoid the situation of short internal battery cells. .

In one embodiment of the present disclosure, the height of the bonding area is greater than or equal to the height of the non-adhesive area, in order to ensure that the insulating tape can be firmly bonded to the electrode assembly.

In an embodiment of the present disclosure, the ratio of the height of the non-adhesive area to the height of the insulating tape ranges from 0.2 to 0.5.

In the embodiment of the present disclosure, the bonding stability between the insulating tape and the electrode assembly is ensured, so that the insulating tape can insulate between the pole lug and the casing, and an excessive proportion of the height of the non-adhesive area can be avoided. , which results in the non-adhesive area having weak support and being unable to maintain an upright state, in order to further avoid the occurrence of internal shortness of the battery cells.

The present disclosure provides a battery cell, which includes: a casing, a positive current collector, a negative current collector, a positive terminal cover, a negative terminal cover, and a battery core structure as described in any one of the above; wherein,

The positive end cover and the negative end cover are located at opposite ends of the housing, and together with the housing form a closed cavity, the battery core structure is located in the closed cavity, and the The positive ear portion of the battery core structure is connected to the positive terminal cover through the positive current collector, and the negative electrode ear portion of the battery core structure is connected to the negative terminal cover through the negative current collector.

In the embodiments of the present disclosure, the cell structure in the battery cell uses insulating tape to insulate the pole ears from the case, which prevents the two pole ears of the electrode assembly from being connected to the case at the same time, thereby reducing the risk of shortcomings in the battery cell. risks of.

In this disclosure, the side of the insulating tape away from the main body protrudes from the end surface of the lug portion, which can further avoid the risk of the lug portion directly overlapping the inner wall of the case when the battery cell shakes, causing an internal short circuit.

In addition, the present disclosure sets the insulating tape as a semi-adhesive insulating tape. Specifically, the insulating tape is provided with an adhesive area and a non-adhesive area, and the adhesive area is connected to the tab part or At least one of the main body parts is connected, and the boundary line between the non-adhesive area and the bonding area is set higher than the end surface of the pole lug part or flush with the end surface of the pole lug part to avoid the insulating tape being higher than the end surface of the pole lug part. When part of the battery is folded and comes into contact with the pole lug, part of the pole lug will be lifted up due to the rebound of the insulating tape, which can reduce the possibility of both pole ears being connected to the case at the same time and reduce the risk of short battery cells.

In an embodiment of the present disclosure, the positive electrode ear portion is connected to the housing, and at least the outer peripheral side of the negative electrode ear portion is surrounded by the insulating tape.

In the embodiment of the present disclosure, the two pole ears are prevented from being connected to the casing at the same time, thereby reducing the risk of internal shortage of the battery cell and extending the service life of the battery cell.

In an embodiment of the present disclosure, both the positive current collector and the negative current collector include a first connection part, a bending part and a second connection part connected in sequence, and the first connection part of the positive current collector The second connection part of the positive current collector is connected to the positive terminal cover, the first connection part of the negative current collector is connected to the negative ear part, and the first connection part of the negative current collector is connected to the negative electrode ear part. The second connecting part is connected to the negative terminal cover;

Wherein, the non-adhesive area of the insulating tape is arranged around the bending part and is spaced from the outer peripheral side of the bending part.

In the embodiment of the present disclosure, the gap between the bending part and the insulating tape can be used to prevent the bending part from directly contacting the inner wall surface of the case and causing the battery cell to become short when it is deflected to a certain extent. , thereby increasing the service life of the battery cells.

The present disclosure provides an energy storage device. The energy storage device includes a box and a plurality of battery cells as described above. The plurality of battery cells are connected in series or in parallel and installed in the box. in the body.

In the embodiments of the present disclosure, multiple battery cells can be provided in the energy storage device, thereby increasing the battery capacity of the energy storage device and extending the use time of the energy storage device, thereby increasing the applicable scenarios of the energy storage device and improving energy storage. The market competitiveness of the device.

The present disclosure provides an electrical device. The electrical device includes a load and the above energy storage device. The load is electrically connected to the energy storage device. The energy storage device provides electrical energy to the load. Utilizing the large battery capacity of the energy storage device, more electrical energy can be provided to the load, thereby extending the use time of the electrical device.

Additional features and advantages of the disclosure will be apparent from the following detailed description, or, in part, may be learned by practice of the disclosure.

It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and do not limit the present disclosure.

Description of the drawings

The above and other features and advantages of the present disclosure will become more apparent by describing in detail example embodiments thereof with reference to the accompanying drawings.

Figure 1 is a schematic three-dimensional structural diagram of a battery cell in an embodiment of the present disclosure.

FIG. 2 is a cross-sectional view of a battery cell in a three-dimensional perspective according to an embodiment of the present disclosure.

FIG. 3 is a schematic assembly diagram of a battery cell in a flat state with its current collector in an embodiment of the present disclosure.

FIG. 4 is a partial enlarged schematic diagram of a pole lug in FIG. 2 .

Figure 5 is a schematic structural diagram of an insulating tape in an embodiment of the present disclosure.

FIG. 6 is a schematic structural diagram of an adhesion method between an insulating tape and an electrode assembly in an embodiment of the present disclosure.

Figure 7 is a schematic structural diagram of another adhesion method between the insulating tape and the electrode assembly in the embodiment of the present disclosure.

Figure 8 is a schematic three-dimensional structural diagram of an energy storage device in an embodiment of the present disclosure.

Figure 9 is a schematic three-dimensional structural diagram of an electrical device in an embodiment of the present disclosure.

Among them, the reference symbols are explained as follows:

1. Energy storage device;

10. Battery cells;

101. Cell structure;

1011. Electrode assembly; 10111. Main body part; 10112. Pole ear part;

1012. Insulating tape; 10121. Bonding area; 10122. Non-bonding area; 10123. Insulating base material; 10124. Adhesive layer;

102. Shell; 103. Closed cavity;

104. Current collector; 1041. First connection part; 1042. Bending part; 1043. Second connection part;

105. End cap;

11. Box;

2. Load;

3. Electrical devices;

H, the height of the insulating tape; H1, the height of the non-adhesive area; H2, the height of the adhesive area; H3, the height of the pole tab.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments. To those skilled in the art. The same reference numerals in the drawings indicate the same or similar structures, and thus their detailed descriptions will be omitted.

The present disclosure provides a battery cell 10. The battery cell 10 may include a cell structure 101, a casing 102, a current collector 104, and an end cover 105.

The structure of the battery cell 10 mentioned in the embodiment of the present disclosure will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 , the housing 102 can be a closed annular structure. The "annular shape" mentioned here is not limited to a circle, and can also be an ellipse, a rectangle, or other irregular shapes, etc.

For example, when the battery cell 10 is a lithium battery, the case 102 can be an aluminum case to increase the stability of the battery cell 10 and reduce the weight of the battery cell 10. The material of the aluminum case is generally aluminum. Manganese alloy, but not limited to this, can also be made of other materials, depending on the specific circumstances.

Two end caps 105 may be provided, respectively located at opposite ends of the housing 102 to seal the housing 102 (as shown in FIG. 2 ). Specifically, one of the two end caps 105 can be defined as a positive end cap, and the other can be defined as a negative end cap. The positive end cap and the negative end cap are provided at opposite ends of the housing 102 and surround the housing 102 together. into a closed cavity 103.

It should be understood that the end cap 105 in the embodiment of the present disclosure may include structures such as pole posts, sealing rings, and plastic pressing blocks, which are not specifically limited here.

The current collector 104 is located in the closed cavity 103, and two of them can be provided. One of them can be defined as the positive current collector and is connected to the positive terminal cover, specifically, it can be connected to the positive pole of the positive terminal cover, and the other can be defined as the negative current collector. The current collector is connected to the negative terminal cover. Specifically, it can be connected to the negative pole of the negative terminal cover.

The battery core structure 101 may be located in the closed cavity 103. The battery core structure 101 may include an electrode assembly 1011 and an insulating tape 1012, as shown in FIG. 3 .

In this embodiment, the electrode assembly 1011 may be a rolled electrode assembly, but is not limited thereto. For example, the electrode assembly 1011 may also be a laminated electrode assembly.

It should be noted that the electrode assembly 1011 may include a positive electrode piece, a first separator, a negative electrode piece and a second separator stacked in sequence.

Taking the electrode assembly 1011 as a rolled electrode assembly as an example, the rolled electrode assembly is formed by winding a positive electrode piece, a first separator, a negative electrode piece and a second separator in a certain direction.

Among them, the positive electrode piece, the first separator, the negative electrode piece, and the second separator form the electrode assembly 1011 by surrounding a roll core structure. Before performing the winding process, the position of the roll core can be fixed first, and then the positive electrode can be rolled using a press. The pole piece, the first separator, the negative pole piece, and the second separator are wound around the winding core. After the winding is completed, the winding core is pulled out to form the electrode assembly 1011 of this embodiment.

In addition, the electrode assembly 1011 can be divided into a main body portion and two tab portions located on opposite sides of the main body portion in the axial direction of the winding core. In other words, the electrode assembly 1011 can include a main body portion 10111 and two tab portions. 10112. The pole tabs 10112 are located at opposite ends of the main body 10111. One of the two pole tabs 10112 can be defined as the positive tab and is connected to the positive current collector, and the other can be defined as the negative tab, and Connected to negative current collector.

It should be noted that when the positive electrode piece, the first separator, the negative electrode piece, and the second separator are rolled to form the electrode assembly 1011, the positive electrode piece and the negative electrode piece are protrudingly disposed compared with the first separator and the second separator. , the positive electrode piece protrudes from one end close to the positive current collector and forms a positive all-pole tab, and the negative electrode piece protrudes from one end close to the negative current collector and forms a negative all-pole tab.

After the two full pole lugs are flattened and shaped, the two pole tabs 10112 are formed. However, the process of making the pole tabs 10112 from the full pole tabs does not end there. The pole tabs 10112 can also be formed by die cutting and other processes.

The formed tab height H3 is generally 60% of the total tab height, but it is not absolute and can be determined according to the actual situation.

The formed electrode assembly 1011 can be disposed in the closed cavity 103. It should be understood that the positive electrode piece and the negative electrode piece are made of conductive materials, that is, the tab portion 10112 is conductive.

When the electrode assembly 1011 is located in the closed cavity 103, the electrode lug 10112 at the end of the electrode assembly 1011 may come into contact with the case 102, and the contact with the case 102 may be the positive electrode lug or the negative electrode lug, but It is also possible that the positive electrode ear and the negative electrode ear are in contact with the case 102 at the same time. When the positive electrode ear and the negative electrode ear are in contact with the case 102 at the same time, the positive electrode and the negative electrode of the battery cell 10 are connected, thereby causing the battery cell 10 to Internal shortness occurs.

In order to prevent the positive electrode lug and the negative electrode lug from contacting the casing 102 at the same time and causing the battery cell 10 to become short, insulating tape 1012 is used on the outer circumferential side of at least one electrode lug 10112 for surrounding attachment (also known as (called encapsulation) to insulate the tabs 10112 and the casing 102 to prevent the positive and negative electrodes of the battery cell 10 from being connected, causing internal shortage of the battery cell 10 .

For example, in the embodiment of the present disclosure, the housing 102 may be connected to the positive electrode lug. In this case, at least the outer peripheral side of the negative electrode lug needs to be covered with glue; or the housing 102 may also be connected to the negative electrode lug. At this time, at least the outer peripheral side of the positive electrode lug needs to be covered with glue; or, neither the positive electrode lug nor the negative electrode lug is connected to the case 102. In this case, insulation is provided on the outer peripheral side of the positive electrode lug and the negative electrode lug. Tape 1012 for lagging.

In addition, in order to prevent the positive electrode lug and the negative electrode lug from simultaneously contacting the inner wall surface of the case 102 when the electrode assembly 1011 shakes, causing an internal short circuit in the battery cell 10 , when the electrode lug 10112 is encapsulated, The insulating tape 1012 can be made higher than the end surface of the tab portion 10112 to further avoid overlapping between the tab portion 10112 and the housing 102 .

However, it should be noted that encapsulation refers to the partial encapsulation of the electrode assembly 1011, that is, the encapsulation of the tab portion 10112 of the electrode assembly 1011, rather than the encapsulation of the entire electrode assembly 1011. On the one hand, if Encapsulating the entire electrode assembly 1011 is difficult to operate and has low efficiency. It can easily cause the outer surface of the electrode assembly 1011 and the insulating tape 1012 to be unevenly adhered, resulting in the insulating tape 1012 not being firmly adhered and easily falling off from the electrode assembly 1011; On the other hand, because the outermost layer of the main body portion 10111 in the middle of the tab portion 10112 is covered with separator insulation, if the entire electrode assembly 1011 is covered with the insulating tape 1012, the usage amount of the insulating tape 1012 will be increased, thus increasing the This reduces the production cost of the battery cell 10 . That is to say, by partially encapsulating the electrode assembly 1011 , the present disclosure can ensure the stability of the adhesion between the insulating tape 1012 and the electrode assembly 1011 while also reducing costs.

It should be understood that the above-mentioned end surface of the tab portion 10112 refers to the end of the tab portion 10112 away from the main body portion 10111 .

In one embodiment of the present disclosure, the positive electrode ear portion of the battery core structure 101 is connected to the positive terminal cover through a positive current collector, and the negative electrode ear portion of the battery core structure 101 is connected to the negative terminal cover through a negative current collector.

For example, after the electrode lug portion 10112 is encapsulated to form the battery core structure 101, the battery core structure 101, the current collector 104, and the end cover 105 can be assembled first; specifically, one end of the current collector 104 can be first assembled with The tab part 10112 is connected, and then the current collector 104 is bent, so that the other end of the current collector 104 is bent to the tab part 10112 and connected to the end cover 105. Based on this, it can be seen that the current collector 104 can be defined as It includes a first connection part 1041, a bending part 1042, and a second connection part 1043 (as shown in Figure 4) connected in sequence, wherein the first connection part 1041 of the positive current collector is connected to the positive ear part, and the third connection part of the positive current collector is connected to the cathode lug. The two connecting parts 1043 are connected to the positive terminal cover, the first connecting part 1041 of the negative current collector is connected to the negative ear part, and the second connecting part 1043 of the negative current collector is connected to the negative terminal cap.

It should be clear that when one end of the current collector 104 is welded to the tab portion 10112, since the current collector 104 is in an unfolded state, part of the current collector 104 will interfere with the insulating tape 1012, and the insulating tape 1012 will be higher than the The part of the tab part 10112 is pressed against the end surface of the tab part 10112. If the insulating tape 1012 is sticky above the part of the tab part 10112, there is a possibility that the insulating tape 1012 will rebound after the current collector 104 is bent. A small portion of the tabs will be lifted up, and the lifted tabs may overlap the case 102 when the electrode assembly 1011 shakes, thus causing the battery cell 10 to become short.

In order to avoid this situation, in the embodiment of the present disclosure, the insulating tape 1012 is set to a semi-adhesive structure, that is, the insulating tape 1012 is divided into an adhesive area 10121 and a non-adhesive area 10122, as shown in Figure 5, where,

The bonding area 10121 is bonded to the outer peripheral side of at least one of the main body portion 10111 and the tab portion 10112. That is, the bonding area 10121 can be bonded to the tab portion 10112 (as shown in Figure 6), or it can At the same time, it is bonded to the tab part 10112 and the main body part 10111 (as shown in Figure 7).

The non-adhesive area 10122 is located on the side of the adhesive area 10121 away from the main body 10111. Since the insulating tape 1012 is higher than the end surface of the pole lug 10112, the surface of the non-adhesive area 10122 away from the adhesive area 10121 can be higher than the pole. The end surface of the lug part 10112, and the boundary line between the non-adhesive area 10122 and the bonding area 10121 is lower than the end surface of the lug part 10112 or flush with the end surface of the lug part 10112, that is, when using the insulating tape 1012 to oppose the electrode When the component 1011 is encapsulated, the boundary line between the non-adhesive area 10122 and the adhesive area 10121 cannot be higher than the end surface of the pole lug 10112. This makes the area in the insulating tape 1012 higher than the pole lug 10112 non-sticky. Compared with the insulation The tape 1012 is a technical solution with an all-glue structure, which can prevent the part of the insulating tape 1012 that is higher than the pole lug 10112 from being sticky and bonding with the end face of the pole lug 10112 when subjected to external pressure, and from rebounding when the insulating tape 1012 Sometimes, a small part of the tabs may be lifted up, thereby reducing the possibility of the tabs overlapping with the inner wall of the casing 102 , thus preventing the positive and negative poles of the battery cell 10 from being connected, and reducing the risk of shorting the battery cell 10 .

In an embodiment of the present disclosure, the insulating tape 1012 may include an insulating base material 10123 and an adhesive layer 10124. It should be noted that the insulating base material 10123 itself does not have adhesive properties. In order to form the insulating tape 1012, the insulating base material 10123 may be A glue layer 10124 is provided on the side of 10123 close to the electrode assembly 1011. This glue layer 10124 is located in a local area of the insulating base material 10123 and is bonded to at least one of the main body part 10111 and the tab part 10112, so that the insulating tape 1012 fixed on the electrode assembly 1011.

Among them, the area where the adhesive layer 10124 is provided on the insulating base material 10123 can be understood as the bonding area 10121, and the area where the adhesive layer 10124 is not provided on the insulating base material 10123 can be understood as the non-adhesive area 10122, that is to say, the insulating tape The part of 1012 located in the non-adhesive area 10122 only has the insulating base material 10123, and no other parts are provided to reduce costs.

In one embodiment of the present disclosure, the non-adhesive area 10122 of the insulating tape 1012 may be disposed around the bending portion 1042 of the current collector 104 and be spaced apart from the outer peripheral side of the bending portion 1042 .

It should be noted that the current collector 104 is made of conductive material. When the electrode assembly 1011 shakes, the current collector 104 may shift in position. By utilizing the distance between the bent portion 1042 and the insulating tape 1012, the current collector 104 can be adjusted to a certain extent. This prevents the bent portion 1042 from directly contacting the inner wall surface of the housing 102 and causing the battery cell 10 to become short when it is deflected, thereby increasing the service life of the battery cell 10 .

In one embodiment of the present disclosure, the ratio of the height H1 of the non-adhesive area to the height H3 of the tab portion in the insulating tape 1012 ranges from 1.2 to 2, such as: 1.2, 1.4, 1.6, 1.8, 2, etc., designed in this way It can be ensured that the height of the non-adhesive area 10122 in the insulating tape 1012 is large enough, thereby ensuring that during the process of pasting the insulating tape 1012, the portion of the insulating tape 1012 higher than the pole lug 10112 is always the non-adhesive area 10122, so as to isolate the The contact between the tab part 10112 and the current collector 104 and the case 102 prevents the battery cell 10 from being short. On the other hand, the height H1 of the non-adhesive area in the insulating tape 1012 should not be too high, thereby reducing insulation. The use of the base material 10123 saves production costs. In addition, it can also avoid the situation that the height H1 of the non-adhesive area is too high, which causes the non-adhesive area 10122 to have weak support and cannot maintain the upright state well. This can be further avoided. The battery cell 10 is internally short.

In an embodiment of the present disclosure, the height H2 of the bonding area in the insulating tape 1012 is greater than or equal to the height H1 of the non-adhesive area in the insulating tape 1012 .

It should be noted that the insulating tape 1012 is sticky in the bonding area 10121, but not in the non-adhesive area 10122. In order to ensure that the insulating tape 1012 can be firmly bonded to the electrode assembly 1011, the insulating tape 1012 is bonded The area height H2 should be greater than or equal to the height H1 of the non-adhesive area in the insulating tape 1012.

Optionally, the ratio of the height H1 of the non-adhesive area to the height H of the insulating tape ranges from 0.2 to 0.5, such as: 0.2, 0.3, 0.4, 0.5, etc. This design can not only ensure that the insulating tape 1012 can be aligned with the pole lug 10112 Insulation between the case 102 and the case 102 can also prevent the non-adhesive area 10122 from having an excessively high proportion of height H1, resulting in the non-adhesive area 10122 having weak support and being unable to maintain an upright state, thereby further preventing the battery cells from being 10 is short inside, at the same time, the bonding stability between the insulating tape 1012 and the electrode assembly 1011 can be ensured.

As shown in FIG. 8 , the present disclosure provides an energy storage device 1 . The energy storage device 1 includes a box 11 and a battery cell 10 . A plurality of battery cells 10 are connected in series or in parallel and installed in the box 11 .

When multiple battery cells 10 are provided in the energy storage device 1 , the battery capacity of the energy storage device 1 can be increased, thereby extending the use time of the energy storage device 1 , thus increasing the applicable scenarios of the energy storage device 1 and improving storage efficiency. Can device 1's market competitiveness.

In addition, the box 11 is used to place the battery cells 10. The box 11 can not only protect the battery cells 10, but also can protect the battery cells 10 when there are multiple battery cells 10 in the energy storage device 1. A plurality of battery cells 10 are fixed.

As shown in Figure 9, the present disclosure provides an electrical device 3. The electrical device 3 includes a load 2 and the energy storage device 1 mentioned above. The load 2 is electrically connected to the energy storage device 1, and the energy storage device 1 is electrically connected to the energy storage device 1. The device 1 can provide electric energy to the load 2. The large battery capacity of the energy storage device 1 can be used to provide more electric energy to the load 2, thereby extending the use time of the electric device 3.

In addition, it should be noted that the electric device 3 in the embodiment of the present disclosure may be an energy storage device, a vehicle, an energy storage container, etc., but is not limited thereto, and may also be other electric device 3 using the energy storage device 1 .

In the application embodiments, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless There are clear limitations. The terms "installation", "connection", "connection" and "fixing" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be Either directly or indirectly through an intermediary. For those of ordinary skill in the art, the specific meanings of the above terms in the application embodiments can be understood according to specific circumstances.

In the description of the application embodiments, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", etc. are based on those shown in the drawings. The orientation or positional relationship is only for the convenience of describing the embodiments of the application and simplifying the description, but does not indicate or imply that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as an implementation of the application. Example limitations.

In the description of this specification, the terms "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in the application implementation. in at least one embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above are only preferred embodiments of the application embodiments, and are not intended to limit the application embodiments. For those skilled in the art, the application embodiments may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the applied embodiments shall be included in the protection scope of the applied embodiments.

Claims (12)

1. A battery core structure, characterized in that the battery core structure includes: An electrode assembly includes a main body and bipolar ears located at opposite ends of the main body. One of the two polar ears is a positive electrode and the other is a negative electrode; Insulating tape, the outer peripheral side of at least one of the tab parts is surrounded by the insulating tape, the insulating tape has an adhesive area and a non-adhesive area, the adhesive area is connected to the main body part and the tab part The outer peripheral sides of at least one of them are bonded, the non-bonding area is located on the side of the bonding area away from the main body, and the surface of the non-bonding area away from the bonding area is higher than the surface of the bonding area. The end surface of the pole lug part, and the boundary line between the non-bonded area and the bonding area is lower than the end surface of the pole lug part or flush with the end surface of the pole lug part. 2. The battery core structure according to claim 1, wherein the insulating tape includes an insulating base material and an adhesive layer, and the portion of the insulating base material located in the bonding area is provided with the adhesive layer, The glue layer is bonded to at least one of the main body part and the tab part. 3. The battery core structure according to claim 1, wherein the bonding area is bonded to the outer peripheral sides of the main body part and the tab part. 4. The battery core structure according to claim 1, wherein the boundary line between the non-adhesive area and the adhesive area is flush with the end surface of the tab part. 5. The battery core structure according to claim 1, wherein the ratio of the height of the non-adhesive area to the height of the tab portion ranges from 1.2 to 2. 6. The battery core structure according to claim 1, wherein the height of the bonding area is greater than or equal to the height of the non-bonding area. 7. The battery core structure according to claim 6, wherein the ratio of the height of the non-adhesive area to the height of the insulating tape ranges from 0.2 to 0.5. 8. A battery cell, characterized in that it includes: a casing, a positive current collector, a negative current collector, a positive end cover, a negative end cover, and the cell structure according to any one of claims 1 to 7; in, The positive end cover and the negative end cover are located at opposite ends of the housing, and together with the housing form a closed cavity, the battery core structure is located in the closed cavity, and the The positive ear portion of the battery core structure is connected to the positive terminal cover through the positive current collector, and the negative electrode ear portion of the battery core structure is connected to the negative terminal cover through the negative current collector. 9. The battery cell according to claim 8, wherein the positive electrode lug is connected to the case, and at least the outer peripheral side of the negative electrode lug is surrounded by the insulating tape. 10. The battery cell according to claim 9, wherein the positive current collector and the negative current collector each include a first connection part, a bending part and a second connection part connected in sequence, and the positive current collector The first connection part of the current collector is connected to the positive electrode ear part, the second connection part of the positive current collector is connected to the positive terminal cover, and the first connection part of the negative current collector is connected to the negative electrode ear part. , the second connecting portion of the negative current collector is connected to the negative terminal cover; Wherein, the non-adhesive area of the insulating tape is arranged around the bending part and is spaced from the outer peripheral side of the bending part. 11. An energy storage device, characterized in that the energy storage device includes a box and a plurality of battery cells according to any one of claims 8 to 10, and a plurality of the battery cells are connected in series or in parallel, and installed in the box. 12. An electrical device, characterized in that the electrical device includes a load and an energy storage device as claimed in claim 11, the load is electrically connected to the energy storage device, and the energy storage device is The load provides electrical energy.