CN218975576U - Cells, battery packs and vehicles - Google Patents

Abstract

The utility model provides a single battery, a battery pack and a vehicle, wherein the single battery comprises: a housing defining an accommodation space therein; the battery cell comprises a body and a tab, wherein the outer surface of the body comprises a top surface, a bottom surface, two end surfaces and two side surfaces, the top surface and the bottom surface are distributed at intervals and are oppositely arranged, the two end surfaces and the two side surfaces are respectively positioned between the top surface and the bottom surface, the areas of the end surfaces and the side surfaces are smaller than the areas of the top surface and the bottom surface, and the end part of the tab is arranged on at least one end surface; and the heat conducting piece is at least partially filled between the shell and at least one of the side face and the end face, and at least one part of the heat conducting piece is in heat conducting contact with the tab and the shell respectively. The single battery can conduct heat near the position of the pole to the shell.

Description

Cells, battery packs and vehicles

technical field

The utility model relates to the technical field of batteries, in particular to a single battery, a battery pack and a vehicle.

Background technique

The battery cell in the battery pack in the prior art includes the battery cell body and the tabs. When electrified, the heat generated by the battery cells is relatively large, especially at the position of the tabs. The heat of the battery core accumulates inside the battery core, which can easily lead to thermal runaway and is not conducive to fast charging.

Utility model content

One purpose of this utility model is to provide a new technical solution for a single battery, which can solve the problem in the prior art that the heat of the battery core is accumulated inside the battery core, which easily leads to thermal runaway and is not conducive to fast charging.

Another object of the present utility model is to provide a battery pack, which includes the above-mentioned single battery.

Another object of the present utility model is to provide a vehicle, which includes the above-mentioned battery pack.

According to an object of the present utility model, a single battery is provided, including: a housing, the housing defines a receiving space; an electric core, the electric core includes a body and tabs, and the outer surface of the body includes A top surface, a bottom surface, two end surfaces and two side surfaces, the top surface and the bottom surface are spaced apart and arranged opposite to each other, and the two end surfaces and the two side surfaces are respectively located between the top surface and the bottom surface Between, the area of the end surface and the side surface is smaller than the area of the top surface and the bottom surface, the end of the tab is provided on at least one of the end surfaces; the heat conduction element, at least a part of the heat conduction element is filled in Between at least one of the side surface and the end surface and the housing, at least a part of the heat conducting member is in thermal contact with the tab and the housing respectively.

Optionally, the heat conduction part includes: a first heat conduction part, the first heat conduction part is filled between the side part of the tab and the housing; a second heat conduction part, the second heat conduction part is filled between the side and the housing.

Optionally, the first heat conduction part is thermally connected to the second heat conduction part.

Optionally, the heat conducting member is an integral molding.

Optionally, the heat conducting element is an insulating element.

Optionally, a part of the heat conducting element acts as a diaphragm in the body.

Optionally, the first gap between the side of the tab and the housing is equal to the second gap between the side of the body and the housing, and the heat conducting member is at least filled in the First gap.

Optionally, the first gap between the side of the tab and the housing is larger than the second gap between the side of the body and the housing, and the heat conducting member fills at least the first gap. a gap.

Optionally, the heat conducting element is a potting compound or a phase change material.

Optionally, the housing includes: a first shell, the first shell is provided with an accommodating groove with an open end, and the accommodating groove is used for accommodating the electric core and filling the heat conducting element; a second shell, The second shell can close the open end after the heat conducting member is filled between the electric core and the first shell, and the second shell and the first shell cooperate to form the containment space.

According to another object of the present utility model, a battery pack is provided, comprising any one of the above-mentioned single batteries.

According to another object of the present utility model, a vehicle is provided, including the above-mentioned battery pack.

According to the single battery of the utility model, by filling the storage space with heat-conducting elements, not only can the heat at the tab position be quickly exported to the housing position, but the heat exportability of the tab position with large heat generation can be improved, and the The temperature rise of the single battery during the charging and discharging process can also reduce the space occupied by the heat-conducting parts, providing the possibility to realize fast charging.

Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principle of the invention.

FIG. 1 is a partial exploded view of a single battery according to an embodiment of the present invention;

2 is a schematic diagram of the internal structure of a single battery according to another embodiment of the present invention;

3 is a cross-sectional view of a cell of a single battery according to another embodiment of the present invention;

Fig. 4 is a schematic diagram of the internal structure of a single battery according to another embodiment of the present invention.

reference sign

Single battery 100;

Housing 10; first shell 11; second shell 12;

Cell 20; body 21; top surface 211; bottom surface 212; end surface 213; side surface 214; tab 22; positive pole piece 23; diaphragm 24; negative pole piece 25;

The heat conduction element 30; the first heat conduction part 31; the second heat conduction part 32; the third heat conduction part 33;

The first gap 40 ; the second gap 50 .

Detailed ways

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature, and in no way serves as any limitation of the invention and its application or use.

Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the description.

In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other instances of the exemplary embodiment may have different values.

It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

The unit battery 100 according to the embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 and FIG. 2 , a single battery 100 according to an embodiment of the present invention includes a casing 10 , a battery cell 20 and a heat conducting member 30 .

Specifically, the casing 10 defines a storage space, the battery core 20 includes a body 21 and tabs 22, the body 21 can be a pole core, and the outer surface of the body 21 includes a top surface 211, a bottom surface 212, two end surfaces 213 and two Two side surfaces 214, the top surface 211 and the bottom surface 212 are spaced apart and arranged oppositely, the two end surfaces 213 and the two side surfaces 214 are respectively located between the top surface 211 and the bottom surface 212, and the area of the end surface 213 and the side surface 214 is smaller than the top surface 211 and the bottom surface 212, the end of the tab 22 is set on at least one end surface 213, at least a part of the heat conduction member 30 is filled between at least one of the side surface 214 and the end surface 213 and the housing 10, at least a part of the heat conduction member 30 is respectively connected to the pole The ear 22 is in thermally conductive contact with the housing 10 .

In other words, the single battery 100 according to the embodiment of the present utility model is mainly composed of the casing 10 , the battery cell 20 and the heat conducting member 30 , and a storage space is formed in the casing 10 , and the casing 10 can play a role of accommodating. A battery cell 20 is placed in the accommodation space, and the battery cell 20 may include a body 21 and a tab 22 disposed on the body 21 .

Specifically, the outer surface of the body 21 can be mainly composed of a top surface 211, a bottom surface 212, two end surfaces 213 and two side surfaces 214. For the convenience of description, the two end surfaces 213 are defined as a first end surface and a second end surface, and Two sides 214 are defined as a first side and a second side. Wherein, the top surface 211 and the bottom surface 212 are spaced apart from each other, the first end surface and the second end surface are spaced apart from each other, and the first side surface and the second side surface are spaced apart from each other.

For example, the top surface 211 and the bottom surface 212 are spaced apart along the vertical direction, the first side surface and the second side surface are spaced apart along the front-to-back direction, and the first end surface and the second end surface are spaced apart along the left-right direction.

Wherein, the areas of the first end surface, the second end surface, the first side surface and the second side surface are all smaller than the areas of the top surface 211 and the bottom surface 212, that is to say, the first side surface and the second side surface can be defined as small surfaces respectively, and The top surface 211 and the bottom surface 212 are respectively defined as large surfaces.

The tab 22 is arranged on at least one end face 213, and the number of the tab 22 may be multiple, and the plurality of tabs 22 may include a positive tab and a negative tab, and the positive tab and the negative tab may be arranged on one end face 213, or The positive pole ear is arranged on the first end surface, and the negative pole ear is arranged on the second end surface. Optionally, the core body 21 and the tab 22 in the single battery 100 are integrally cut and shaped, and the poles and the like can be connected to the tabs 22 by crimping or welding. etc. can be assembled to form an overall structure.

It should be noted that, the accommodation space is filled with a heat-conducting material, and at least a part of the heat-conducting member 30 is filled between the electric core 20 and the housing 10 . Wherein, at least a part of the heat conduction member 30 is filled between at least one of the side surface 214 and the end surface 213 and the housing 10, and at least a part of the heat conduction member 30 is in thermal contact with the tab 22 and the housing 10 respectively. In the present invention, Heat conduction contact refers to mutual contact and heat exchange between the two. By making heat conduction contact between the heat conduction member 30 and the tab 22 and the housing 10 respectively, the rate at which the heat of the tab 22 is transferred to the housing 10 can be increased, thereby improving For the heat export efficiency of the tab 22 position. That is to say, the tab 22 may include two sides and two ends, wherein one end may be connected to the end face 213, the other end may face the housing 10, and one side may be connected to the first side at the same time. One inner wall of the housing 10 is disposed opposite to each other, and the other side can be disposed opposite to the other inner wall of the housing 10 at the same time as the second side.

It can be seen that the heat-conducting material of the present invention is mainly filled inside the housing 10, and by filling at least a part of the heat-conducting member 30 in the position corresponding to the tab 22 inside the housing 10, the production of the tab 22 and the pole part can be reduced. The heat is quickly exported to the outside of the battery cell 20 through the heat conducting member 30 , thereby accelerating the heat removal of the single battery 100 .

That is to say, by filling at least a part of the heat conducting member 30 between the side of the tab 22 and the housing 10, not only the heat near the position of the tab 22 can be transferred to the housing 10 in time, but also the position of the tab 22 can be adjusted. The heat is exported, and the temperature of the tab 22 is targeted, and the heat conduction member 30 is avoided to be installed between the large surface and the shell 10, which can avoid occupying the space between the large surface and the shell 10, thereby avoiding increasing costs and causing The internal effective space of the unit battery 100 is reduced and the external volume is increased.

In addition, by installing at least a part of the heat-conducting element 30 between the housing 10 and the battery core 20 in a filling manner, it is beneficial to improve the bonding force between the heat-conducting element 30 and the housing 10, and by molding the heat-conducting material When the heat conduction element 30 is formed, the shape of the heat conduction element 30 can be regulated, which is beneficial to improve the bonding degree between the heat conduction element 30 and the electric core 20 and the housing 10 , thereby improving the heat conduction efficiency.

It should be noted that filling at least a part of the heat conduction element 30 between the electric core 20 and the casing 10 can be achieved in various ways, for example, at least a portion of the heat conduction element 30 is firstly bonded with The casing 10 is connected, and then the casing 10 and the electric core 20 are welded or integrally formed, which improves the heat conduction and heat dissipation capabilities of the casing 10 and improves the integration of the casing 10 .

Therefore, according to the single battery 100 of the embodiment of the present utility model, the heat conduction element 30 is installed in the storage space, and at least a part of the heat conduction element 30 is filled between at least one of the side surface 214 and the end surface 213 and the casing 10 During this time, not only can the heat at the position of the tab 22 be quickly exported to the housing 10, but also improve the heat conduction capacity and export efficiency of the position of the tab 22 that produces a large amount of heat, and reduce the temperature rise of the single battery 100 during the charging and discharging process. It is also possible to reduce the space occupied by the heat conduction member 30 .

According to an embodiment of the present invention, the heat conduction member 30 includes a first heat conduction portion 31 and a second heat conduction portion 32 , the first heat conduction portion 31 is filled between the side of the tab 22 and the housing 10 , and the second heat conduction portion 32 It is filled between the side 214 and the housing 10 .

That is to say, the heat conduction element 30 is mainly composed of a first heat conduction portion 31 and a second heat conduction portion 32, wherein the first heat conduction portion 31 can be filled between the side of the tab 22 and the housing 10, and the tab 22 can be The heat is conducted to the casing 10, and then to the outside through the casing 10. The second heat conducting part 32 can be filled between the side surface 214 of the body 21 and the housing 10 , and can conduct the heat of the body 21 to the housing 10 , and then to the outside through the housing 10 .

In this embodiment, the first heat conduction portion 31 and the second heat conduction portion 32 can conduct heat conduction to multiple positions of the battery cell 20 and expand the heat conduction area.

According to an embodiment of the present invention, the heat conduction element 30 further includes a third heat conduction portion 33 , which is filled between the end surface 213 and the housing 10 , and can conduct heat from the end surface 213 to the housing 10 .

Optionally, when the positive tab and the negative tab of the cell 20 are extracted from the same side of the cell 20 , for example, from the right side. At this time, the left side of the battery cell 20 can be filled with the third heat conduction portion 33, the front and rear sides can be filled with the second heat conduction portion 32, and the front and rear sides of the positive pole can be filled with the first heat conduction portion 32 respectively. , the front side and the rear side of the negative electrode pole can also be filled with the first heat conducting part 32 respectively. It should be noted that the specific amount and position of the thermally conductive material to be filled can be adjusted according to actual conditions, and will not be described in detail here.

In some specific embodiments of the present utility model, the first heat conduction part 31 and the second heat conduction part 32 are thermally connected, that is to say, heat exchange can occur between the first heat conduction part 31 and the second heat conduction part 32, and the pole piece position The heat of the pole piece is generally greater than the heat of the body 21, so part of the heat at the pole piece position can also be conducted to the second heat conducting part 32, which can improve the cooling rate of the pole piece position.

In some specific implementations of the present utility model, the heat conduction member 30 is an integrally formed part, that is to say, the first heat conduction part 31 and the second heat conduction part 32 are not only in thermal contact, but also an integrally formed part. Manufacturing the heat conduction element 30 has the advantage of being convenient for processing and production.

According to an embodiment of the present invention, the heat conduction member 30 is an insulating member, that is to say, the heat conduction member 30 not only has the function of heat conduction, but also has the function of insulation, without additional insulating materials, which can not only improve the structural compactness of the single battery 100 , can also provide the possibility to increase the battery capacity.

In some specific embodiments of the present utility model, as shown in FIG. 3 , a part of the heat conduction member 30 is used as the diaphragm 24 in the body 21 , that is to say, the cell 20 includes a positive pole piece 23 , a diaphragm 24 and a negative pole piece 25 , wherein a part of the heat conducting member 30 can be used as the diaphragm 24 . That is to say, the heat conduction element 30 may include a fourth heat conduction part and a fifth heat conduction part, wherein the fourth heat conduction part may be the diaphragm 24, and the fifth heat conduction part may be filled between the side surface 214 and the housing 10 alone, or separately filled in the Between the end surface 213 and the housing 10 , or between the side surface 214 and the housing 10 and between the end surface 213 and the housing 10 .

In this embodiment, by using a part of the heat conduction member 30 as the diaphragm 24 of the body 21, not only the insulation effect but also the heat conduction effect can be realized, and the heat conduction effect on the battery core 20 can be further improved, and the inside of the battery core 20 heat export.

According to an embodiment of the present utility model, the first gap 40 between the side of the tab 22 and the housing 10 is equal to the second gap 50 between the side 214 of the body 21 and the housing 10, and the heat conducting member 30 fills at least in the first gap 40 . That is to say, in this embodiment, the width of the lug 22 is equal to the width of the body 21, and the lug 22 is all the lugs 22. At this time, the heat conducting member 30 fills at least the first gap 40, and the lug 22 can be completely filled. 22 conducts heat to the housing 10 . Optionally, the heat-conducting element 30 fills the first gap 40 and the second gap 50 at the same time, and since the tab 22 is a full tab, the heat-conducting element 30 can be formed as a strip with approximately the same width.

In some embodiments of the present utility model, the first gap 40 between the side of the tab 22 and the housing 10 is larger than the second gap 50 between the side 214 of the body 21 and the housing 10, and the heat conducting member 30 is at least Fill in the first gap 40 . That is to say, an open groove can be formed between the side of the tab 22 and the end surface 213 of the body 21 , and at least a part of the heat conducting element 30 can be filled in the open groove to transfer heat from the tab 22 .

Optionally, the heat-conducting member 30 adopts a heat-conducting material piece with a certain insulating performance, which can make it unnecessary to add an additional insulating material piece.

According to an embodiment of the present invention, the heat conduction element 30 may be a vapor chamber, a phase change material, a direct cooling runner cavity or other structures, which are not limited herein.

In some specific embodiments of the present utility model, the heat conduction member 30 is a potting compound or a phase change material, that is to say, the heat conduction member 30 can be formed by filling the potting compound or a phase change material, and the heat conduction member 30 can be an insulating material. Potting compound with thermal conductivity and electrolyte resistance, can also be a phase change material, etc.

Wherein, when the heat conduction element 30 is potting compound, it has a certain insulation performance, and the thermal conductivity is above 0.2 W/m·K. The potting glue can be an epoxy resin system, a silicone system or other materials with temperature resistance, insulation and electrolyte resistance. For example, phase change capsules or particles can also be added to the potting compound, and the size of the addition is not limited, and the additive is mainly used to improve the heat conduction and heat absorption capabilities of the potting compound. When filling, the heat-conducting member 30 can be built into the lower shell through the profiling tooling of the battery cell 20, and then loaded into the battery cell 20 after forming a heat-conducting structure in the upper shell, and finally through the connection of the upper shell and the lower shell, to realize Sealing of the unit cell 100 .

According to an embodiment of the present utility model, the casing 10 includes a first shell 11 and a second shell 12, wherein the first shell 11 is provided with an accommodating groove with an open end, and the accommodating groove is used for accommodating the electric core 20 and filling the heat conducting element 30 , the second case 12 can close the open end after the heat conduction member 30 is filled between the electric core 20 and the first case 11 , and a receiving space is formed between the second case 12 and the first case 11 .

In other words, the housing 10 is mainly composed of a first shell 11 and a second shell 12 , for example, the first shell 11 is a lower shell, which can be formed by stamping. Optionally, the first shell 11 is made of aluminum alloy or steel material, which is beneficial to ensure both strength and thermal conductivity. Optionally, for blade batteries, the thickness of the first shell 11 can be 0.1mm-0.3mm, It is possible to reduce the weight of the housing 10 while ensuring the strength and thermal conductivity of the housing 10 . For other batteries, the thickness of the casing 10 is not limited.

Secondly, the second shell 12 is an upper shell. Optionally, the second shell 12 is made of aluminum alloy or steel material, which is beneficial to ensure strength. Optionally, for the blade battery, the thickness of the second shell 12 is 0.1mm-0.3mm, which is beneficial for the second shell 12 to have both strength and light weight. The second shell 12 and the first shell 11 can be formed into a sealed shell 10 by laser welding, other welding processes, adhesive bonding, or nailless riveting and welding. In addition, the battery cell 20 may be assembled integrally with the second case 12 or separately.

In addition, a receiving groove with an upward opening is defined in the first shell 11 , and a heat-conducting material can be filled in the receiving groove to form the heat-conducting element 30 .

For example, the lower shell includes a lower plate, and a front plate, a rear plate, a left plate and a right plate surrounding the outer periphery of the lower plate, and the upper shell may also be a plate-shaped member, ie an upper plate. Wherein, the housing 10 can be formed by stamping and welding the upper plate, the lower plate, the front plate and the rear plate integrally into a rectangular body, or the upper plate, the lower plate, the front plate, the left plate and the right plate can be integrally stamped and welded to form a rectangular body; A rectangular body may be formed by matching and welding other faces, which is not limited here.

Optionally, the housing 10 may be an aluminum shell or a steel shell, which may have both strength and thermal conductivity.

It should be noted that, as shown in FIG. 2 and FIG. 4 , the positive pole and the negative pole of the battery cell 20 can be drawn out from the same side of the battery cell 20 , or can be drawn out from different sides of the battery cell 20 , which is not limited here.

When assembling the casing 10 and the battery cell 20, etc., the pole core, the tab 22, the pole column, etc. can be assembled and placed in the lower case, or the upper case can be assembled with the battery cell 20 and then placed in the lower case. inside the shell.

In this embodiment, by making the housing 10 include the first shell 11 and the second shell 12, it is beneficial to fill the storage space with a heat-conducting material to form the heat-conducting member 30, avoiding the need to additionally set too many heat-conducting structures and occupying the storage space. space.

In a word, according to the single battery 100 of the present invention, the heat in the vicinity of the tab 22 can be conducted and exported to the casing 10 by using the heat conducting member 30 . That is to say, by filling the accommodating space with the heat conduction element 30 and limiting the position of the heat conduction element 30, the heat conduction capacity of the single battery cell 20 at the position where the local heat generation is large can be improved, for example, the heat conduction capacity to the position of the tab 22 can be improved, Therefore, the degree of temperature rise of the single battery 100 during the charging and discharging process can be reduced, and the heat export efficiency of the single battery 100 can be improved.

The utility model also provides a battery pack, which includes the single battery 100 of any one of the above-mentioned embodiments. Since the single battery 100 can conduct heat in a targeted manner, the heat export efficiency of the single battery 100 can be improved, and The battery pack of the present invention includes the above-mentioned single battery 100 , so the battery pack of the present invention also has the advantage of realizing fast charging, which will not be repeated here.

The utility model also provides a vehicle, which includes the battery pack of any one of the above-mentioned embodiments. Since the battery pack has the advantages of good heat export effect and is conducive to the implementation of fast charging, the vehicle of the utility model also has the advantages of improving user experience. The advantages of sense and safety, etc., will not be repeated here.

Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, rather than limiting the scope of the present invention. It should be understood by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the invention is defined by the appended claims.

Claims (12)

1. A single cell, characterized by comprising:

a housing defining an accommodation space therein;

the battery cell comprises a body and a tab, wherein the outer surface of the body comprises a top surface, a bottom surface, two end surfaces and two side surfaces, the top surface and the bottom surface are distributed at intervals and are oppositely arranged, the two end surfaces and the two side surfaces are respectively positioned between the top surface and the bottom surface, the areas of the end surfaces and the side surfaces are smaller than the areas of the top surface and the bottom surface, and the end part of the tab is arranged on at least one end surface;

and at least one part of the heat conducting piece is filled between the shell and at least one of the side face and the end face, and at least one part of the heat conducting piece is in heat conducting contact with the tab and the shell respectively.

2. The unit cell according to claim 1, wherein the heat conductive member comprises:

a first heat conduction part filled between the side part of the tab and the housing;

and the second heat conduction part is filled between the side surface and the shell.

3. The cell of claim 2, wherein the first thermally conductive portion is in thermally conductive connection with the second thermally conductive portion.

4. A cell according to claim 3, wherein the thermally conductive member is an integrally formed member.

5. The cell according to claim 1, wherein the heat conductive member is an insulating member.

6. The cell according to claim 5, wherein a portion of the thermally conductive member serves as a separator in the body.

7. The unit cell according to claim 1, wherein a first gap between a side portion of the tab and the case is equal to a second gap between a side surface of the body and the case, and the heat conductive member is filled at least in the first gap.

8. The unit cell according to claim 1, wherein a first gap between a side of the tab and the case is larger than a second gap between a side of the body and the case, and the heat conductive member is filled at least in the first gap.

9. The cell of claim 1, wherein the thermally conductive member is a potting compound or a phase change material member.

10. The cell as defined in claim 1, wherein the housing comprises:

a first case provided with a receiving groove having an open end for receiving the battery cell and filling the heat conductive member;

and the second shell can be used for sealing the open end after the heat conducting piece is filled between the battery cell and the first shell, and the accommodating space is formed between the second shell and the first shell in a matching way.

11. A battery pack comprising the single cell of any one of claims 1-10.

12. A vehicle comprising the battery pack of claim 11.

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