CN216720063U

CN216720063U - Single battery and battery pack

Info

Publication number: CN216720063U
Application number: CN202123260728.2U
Authority: CN
Inventors: 孙伟; 刘艳; 谭健
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2021-10-18
Filing date: 2021-12-23
Publication date: 2022-06-10
Anticipated expiration: 2031-12-23

Abstract

The utility model belongs to the technical field of power batteries, and particularly relates to a single battery and a battery pack, wherein the single battery comprises a battery cell, a positive electrode connecting assembly, a negative electrode connecting assembly, a heat conducting pad assembly, a shell and a top cover assembly, wherein the top cover assembly is used for sealing the shell, the battery cell is arranged in the shell and comprises a positive plate, a negative plate and a diaphragm arranged between the positive plate and the negative plate; one end of the positive plate is connected with the top cover assembly through the positive connecting assembly, and one end of the negative plate is connected with the top cover assembly through the negative connecting assembly; the heat conduction pad assembly is arranged in the shell, is in contact with the inner wall of the shell and is in direct contact with the positive connecting assembly or the negative connecting assembly. According to the single battery provided by the embodiment of the utility model, the heat at the positive electrode connecting assembly or the negative electrode connecting assembly can be directly transferred to the shell through the heat conducting pad assembly, so that the cooling heat conduction path is shortened, the heat dissipation efficiency is improved, and the thermal runaway phenomenon caused by heat accumulation is avoided.

Description

Single battery and battery pack

Technical Field

The utility model belongs to the technical field of power batteries, and particularly relates to a single battery and a battery pack.

Background

Compared with the traditional fuel vehicle, the electric vehicle has short endurance mileage and long charging time, which becomes a main problem hindering the development of the electric vehicle. Therefore, the rapid charging technology becomes a development target of battery factories and whole factories. The electric core can produce a large amount of heat when filling fast, if can not evenly dispel the heat effectively, can cause the electric core performance to attenuate sharply to cause corresponding safety problem. At present, the CTP module of a long battery cell is used, and most of the CTP modules adopt a bottom water cooling mode to dissipate heat. However, the heat generated by the long battery cell during quick charging is mainly concentrated at the lug and the connecting sheet, and research shows that the temperature rise at the lug and the connecting sheet is the largest. At present, the cooling heat conduction paths of the heat at the tab and the connecting sheet of the long battery cell are mainly divided into two types, one is the connecting sheet → the tab → the winding core → mylay → the aluminum shell → the cooling plate, and the other is the tab → the connecting sheet → the pole → the top cover → the aluminum shell → the cooling plate.

However, both of the two cooling heat conduction paths are long, so that the heat dissipation efficiency of the long battery cell is low, and the thermal runaway phenomenon is caused by the accumulated heat easily. And, long electric core because of it has longer distance in the Z axle, can aggravate going on of the inside thermal reaction of electric core during the abuse, and the explosion-proof valve position on the top cap can not in time be escaped to the gas that carries out the thermal reaction and produces has certain potential safety hazard.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: the single battery and the battery pack are provided aiming at the problems that in the prior art, the cooling heat conduction path at the lug and the connecting sheet of a long battery cell is long, so that the heat dissipation efficiency of the long battery cell is low, and the thermal runaway phenomenon is caused by the easy accumulation of heat.

In order to solve the technical problem, an embodiment of the present invention provides a single battery, including a battery cell, a positive electrode connection assembly, a negative electrode connection assembly, a heat conducting pad assembly, a casing and a top cover assembly, where the casing has an opening, the top cover assembly is used to seal the opening of the casing, the battery cell is disposed in the casing, and the battery cell includes a positive electrode plate, a negative electrode plate, and a diaphragm disposed between the positive electrode plate and the negative electrode plate;

one end of the positive plate is connected with the top cover assembly through the positive connecting assembly, and one end of the negative plate is connected with the top cover assembly through the negative connecting assembly; the heat conduction pad assembly is arranged in the shell, the heat conduction pad assembly is in contact with the inner wall of the shell, and the heat conduction pad assembly is in contact with the positive connecting assembly or the negative connecting assembly.

Optionally, the positive connection assembly comprises a positive tab and a positive connection piece, the positive tab is arranged on one end of the positive plate, and the positive tab is connected with the positive connection piece and connected with the top cover assembly through the positive connection piece; a part of the heat conduction pad assembly extends into the space between the positive electrode lug and the positive electrode connecting sheet, and the heat conduction pad assembly is simultaneously in direct contact with the surface of the positive electrode lug and the surface of the positive electrode connecting sheet;

the negative electrode connecting assembly comprises a negative electrode tab and a negative electrode connecting piece, the negative electrode tab is arranged on one end of the negative electrode piece, and the negative electrode tab is connected with the negative electrode connecting piece and connected with the top cover assembly through the negative electrode connecting piece; and one part of the heat conduction pad assembly extends into the space between the negative pole lug and the negative pole connecting sheet, and the heat conduction pad assembly is in direct contact with the surface of the negative pole lug and the surface of the negative pole connecting sheet simultaneously.

Optionally, the cover assembly includes a first cover assembly and a second cover assembly, the housing has two opposite openings, the first cover assembly is used for sealing one of the openings of the housing, and the second cover assembly is used for sealing the other opening of the housing; one end of the positive plate is connected with the first top cover assembly through the positive connecting assembly, and one end of the negative plate is connected with the second top cover assembly through the negative connecting assembly.

Optionally, the heat conducting pad assembly includes a first heat conducting pad and a second heat conducting pad, the first heat conducting pad includes two parallel first heat conducting portions and a first contact portion connected between the two parallel first heat conducting portions, the first contact portion directly contacts with the positive electrode connecting assembly, the first contact portion covers an end surface of the battery cell facing the first cap assembly, one of the first heat conducting portions covers a bottom surface of the battery cell and is supported by a bottom wall of the casing, and the other first heat conducting portion covers a top surface of the battery cell and faces a top wall of the casing;

the second heat conducting pad comprises two parallel second heat conducting parts and a second contact part connected between the two parallel second heat conducting parts, the second contact part is in direct contact with the negative electrode connecting assembly, the second contact part covers the end face, right opposite to the second top cover assembly, of the battery cell, one of the second heat conducting parts covers the bottom face of the battery cell and is supported by the bottom wall of the shell, and the other second heat conducting part covers the top face of the battery cell and is right opposite to the top wall of the shell.

Optionally, a first notch recessed towards the positive electrode connecting assembly is formed in a side wall of the first contact portion, and the first contact portion is clamped on the positive electrode connecting assembly through the first notch so as to realize contact between the first contact portion and the positive electrode connecting assembly;

be equipped with the orientation on the lateral wall of second contact site the sunken second breach of negative pole coupling assembling, the second contact site passes through the second breach block is in order to realize on the negative pole coupling assembling the second contact site with negative pole coupling assembling's contact.

Optionally, a first rib protruding towards the housing is arranged on a surface of the first heat conduction pad away from the battery cell, the first rib extends along a bending direction of the first heat conduction pad, and the first rib is used for supporting the first heat conduction pad;

the second heat conducting pad is provided with a second convex rib facing the shell on the surface deviating from the battery core, the second convex rib extends along the bending direction of the second heat conducting pad, and the second convex rib is used for supporting the second heat conducting pad.

Optionally, the battery further includes a mylar film, the electrical core is wrapped by the mylar film, the first heat conduction pad and the second heat conduction pad are both covered on the outer surface of the mylar film, and a plurality of first exhaust holes are formed in the mylar film; and a plurality of second vent holes are formed in the first heat conduction pad and the second heat conduction pad.

Optionally, the shape of the heat conducting pad assembly is a square frame structure, the heat conducting pad assembly is arranged on the outer surface of the battery core in a frame mode, the outer side surface of the heat conducting pad assembly is in contact with the inner wall of the shell, and the side wall of the heat conducting pad assembly is in contact with the positive connecting assembly or the negative connecting assembly.

Optionally, a first notch recessed towards the positive electrode connecting assembly is formed in the heat conducting pad assembly, and the heat conducting pad assembly is clamped on the positive electrode connecting assembly through the first notch so as to realize contact between the heat conducting pad assembly and the positive electrode connecting assembly;

be equipped with the orientation on the heat conduction pad subassembly the sunken second breach of negative pole coupling assembling, the heat conduction pad subassembly passes through second breach block is in order to realize on the negative pole coupling assembling the heat conduction pad subassembly with negative pole coupling assembling's contact.

According to the single battery provided by the embodiment of the utility model, the heat conducting pad assembly is arranged in the shell, the heat conducting pad assembly is contacted with the positive electrode connecting assembly or the negative electrode connecting assembly, and the heat conducting pad assembly is also contacted with the inner wall of the shell; like this the heat of battery cell in positive coupling assembling or negative pole coupling assembling department can be directly on transmitting the casing through the heat conduction pad subassembly, and need not only can be with heat transfer to the casing through a great deal of other structures again, so that the cooling heat conduction path of battery cell in positive coupling assembling or negative pole coupling assembling department shortens, thereby improves battery cell's radiating efficiency, avoids the heat accumulation to lead to the thermal runaway phenomenon to take place.

On the other hand, an embodiment of the present invention further provides a battery pack, which is characterized by including a plurality of the above single batteries, and the plurality of single batteries are electrically connected together.

According to the battery pack provided by the embodiment of the utility model, because the single batteries are adopted, the heat dissipation efficiency of each single battery is improved, the heat dissipation efficiency of the whole battery pack can be greatly improved, and the heat dissipation effect of the battery pack is improved.

Drawings

Fig. 1 is a schematic structural view of a unit cell provided in a first embodiment of the present invention;

FIG. 2 is a schematic sectional view taken along the line A-A in FIG. 1;

FIG. 3 is a schematic cross-sectional view taken along the line B-B in FIG. 2;

fig. 4 is a schematic structural view of a first thermal pad of a unit cell according to a first embodiment of the present invention;

fig. 5 is a plan view of a first thermal pad of a unit cell according to a first embodiment of the present invention;

fig. 6 is an expanded view of a mylar film of a unit cell provided by the first embodiment of the present invention.

The reference numerals in the specification are as follows:

1. an electric core; 2. a positive electrode connecting assembly; 21. a positive electrode tab; 22. a positive electrode connecting sheet; 3. a negative electrode connecting assembly; 31. a negative electrode tab; 32. a negative electrode connecting sheet; 4. a thermally conductive pad assembly; 41. a first thermally conductive pad; 411. a first heat-conducting portion; 412. a first contact portion; 412a, a first gap; 413. a first rib; 42. a second thermally conductive pad; 43. a second vent hole; 5. a housing; 6. a first header assembly; 61. a positive pole column; 62. an explosion-proof valve; 7. a second header assembly; 71. a negative electrode post; 8. mylar film; 81. a first exhaust hole.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "inner", "outer", and the like, indicate an orientation or positional relationship based on that shown in the drawings, merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

First embodiment

As shown in fig. 1 to 6, a single battery according to a first embodiment of the present invention includes a battery cell 1, a positive electrode connecting assembly 2, a negative electrode connecting assembly 3, a thermal pad assembly 4, a case 5, and a top cover assembly, where the case 5 has an opening, the top cover assembly is configured to seal the opening of the case 5, the battery cell 1 is disposed in the case 5, and the battery cell 1 includes a positive electrode tab (not shown), a negative electrode tab (not shown), and a separator (not shown) disposed between the positive electrode tab and the negative electrode tab. The battery core 1 can be made of a positive plate, a negative plate and a diaphragm by the existing battery core processing technology of winding, stacking or folding and the like.

One end of the positive plate is connected with the top cover assembly through the positive electrode connecting assembly 2, and one end of the negative plate is connected with the top cover assembly through the negative electrode connecting assembly 3. The heat conducting pad assembly 4 is arranged in the shell 5, the heat conducting pad assembly 4 is in contact with the inner wall of the shell 5, and the heat conducting pad assembly 4 is in direct contact with the positive connecting assembly 2 or the negative connecting assembly 3. The thermal pad assembly 4 is made of an insulating material having good heat dissipation performance. For example, the material of the thermal pad assembly 4 may be silicone.

The bottom of battery cell is provided with liquid cooling device (not shown in the figure), the liquid cooling device can cool off fast the bottom of casing 5 to make anodal coupling assembling 2 or the heat of negative pole coupling assembling 3 department is through heat conduction pad subassembly 4 transmits to the bottom of casing 5 is again by the liquid cooling device transmits to in battery cell's the external environment, in order to right battery cell carries out better heat dissipation.

In a first embodiment, as shown in fig. 1, the cap assembly includes a first cap assembly 6 and a second cap assembly 7, the housing 5 has two opposite openings, the first cap assembly 6 is used for sealing one of the openings of the housing 5, and the second cap assembly 7 is used for sealing the other opening of the housing 5. One end of the positive plate is connected with the first top cover assembly 6 through the positive connecting assembly 2, and one end of the negative plate is connected with the second top cover assembly 7 through the negative connecting assembly 3. The first top cover assembly 6 is provided with a positive pole post 61, and the second top cover assembly 7 is provided with a negative pole post 71.

Still be equipped with explosion-proof valve 62 on the first top cap subassembly 6, explosion-proof valve 62 is used for opening when casing 5 inner space pressure reaches predetermined blasting value explosion-proof valve 62, it is right to the inner space pressure release of casing 5 avoids the battery cell explodes.

Of course, in other embodiments, the positive electrode post may be disposed on the second cap assembly, and the negative electrode post may be disposed on the first cap assembly.

In a first embodiment, as shown in fig. 2 to 3, the positive electrode connecting assembly 2 includes a positive electrode tab 21 and a positive electrode connecting piece 22, the positive electrode tab 21 is disposed on one end of the positive electrode piece, and the positive electrode tab 21 is connected to the positive electrode connecting piece 22 and electrically connected to the positive electrode post 61 on the first top cover assembly 6 through the positive electrode connecting piece 22.

The positive electrode tab 21 and the positive electrode connecting piece 22 are welded together, and the positive electrode connecting piece 22 is in a bent state after welding is completed. A part of the heat conduction pad assembly 4 extends into the space between the positive electrode tab 21 and the positive electrode connecting sheet 22, and the heat conduction pad assembly 4 is in direct contact with the surface of the positive electrode tab 21 and the surface of the positive electrode connecting sheet 22 at the same time.

The negative pole coupling assembling 3 includes negative pole utmost point ear 31 and negative pole connection piece 32, negative pole utmost point ear 31 sets up on one end of negative pole piece, negative pole utmost point ear 31 with negative pole connection piece 32 is connected, and passes through negative pole connection piece 32 with on the second top cap subassembly 7 negative pole post 71 electric connection.

The negative electrode tab 31 and the negative electrode connecting sheet 32 are welded together, and after welding is finished, the negative electrode connecting sheet 32 is in a bent state. A part of the heat conduction pad assembly 4 extends between the negative electrode tab 31 and the negative electrode connecting piece 32, and the heat conduction pad assembly 4 is in direct contact with the surface of the negative electrode tab 31 and the surface of the positive electrode connecting piece 22.

In a first embodiment, as shown in fig. 2 to 4, the thermal pad assembly 4 includes a first thermal pad 41 and a second thermal pad 42, the first thermal pad 41 includes two parallel first thermal conduction portions 411 and a first contact portion 412 connected between the two parallel first thermal conduction portions 411, the first contact portion 412 extends between the positive electrode tab 21 and the positive electrode connecting plate 22 to directly contact with the positive electrode connecting assembly 2, and the first contact portion 412 covers an end surface of the battery cell 1 facing the first cap assembly 6, one of the first thermal conduction portions 411 covers a bottom surface of the battery cell 1 and is supported by a bottom wall of the casing 5, and the other first thermal conduction portion 411 covers a top surface of the battery cell 1 and faces a top wall of the casing 5.

The first heat conduction portion 411 covering the top surface of the battery cell 1 and facing the top wall of the casing 5 is in contact with the top wall of the casing 5, so that both the first heat conduction portions 411 of the first heat conduction pad 41 can transfer heat of the first contact portion 412 to the casing 5.

In other embodiments, the first heat conduction portion 411 covering the top surface of the battery cell 1 and facing the top wall of the casing 5 may also be spaced from the top wall of the casing 5 without contacting, and the heat conduction pad assembly 4 only transfers the heat of the first contact portion 412 to the bottom of the casing 5 by means of another first heat conduction portion 411.

The second heat conducting pad 42 includes two parallel second heat conducting portions and a second contact portion connected between the two parallel second heat conducting portions, the second contact portion extends into the space between the negative electrode tab 31 and the negative electrode connecting sheet 32 to directly contact with the negative electrode connecting assembly 3, the second contact portion covers the battery cell 1 right on the end face of the second top cover assembly 3, one of the second heat conducting portions covers the bottom surface of the battery cell 1 and is supported by the bottom wall of the casing 5, and the other second heat conducting portion covers the top surface of the battery cell 1 and right on the top wall of the casing 5.

The second heat conduction portion covering the top surface of the battery cell 1 and facing the top wall of the casing 5 is in contact with the top wall of the casing 5, so that both the second heat conduction portions of the second heat conduction pad 42 can transfer heat of the second contact portion to the casing 5.

In other embodiments, the second heat conduction portion covering the top surface of the battery cell 1 and facing the top wall of the casing 5 may also be spaced from the top wall of the casing 5 without contacting, and the heat conduction pad assembly 4 transfers the heat of the second contact portion to the bottom of the casing 5 only by means of another second heat conduction portion.

In the first embodiment, as shown in fig. 3, the first heat conduction portion 411 of the first heat conduction pad 41 covering the bottom surface of the battery cell 1 and supported by the bottom wall of the case 5 and the second heat conduction portion of the second heat conduction pad 42 covering the bottom surface of the battery cell 1 and supported by the bottom wall of the case 5 are directly connected together.

In other embodiments, the first thermal conduction portion of the first thermal conduction pad covering the bottom surface of the battery cell and supported by the bottom wall of the casing and the second thermal conduction portion of the second thermal conduction pad covering the bottom surface of the battery cell and supported by the bottom wall of the casing may be opposite to each other, and the first thermal conduction portion and the second thermal conduction portion are not connected and independent from each other, and a certain gap is left between the first thermal conduction portion and the second thermal conduction portion.

In the first embodiment, as shown in fig. 3, the first heat conduction portion 411 covering the top surface of the battery cell 1 and the second heat conduction portion covering the top surface of the battery cell 1 are directly connected together.

In other embodiments, the first heat conduction portion covering the top surface of the battery cell and the second heat conduction portion covering the top surface of the battery cell may also face each other, and the first heat conduction portion and the second heat conduction portion are not connected and are independent from each other, and a certain gap is left between the first heat conduction portion and the second heat conduction portion.

In the first embodiment, as shown in fig. 4, a first notch 412a recessed toward the positive electrode connecting assembly 2 is provided on a side wall of the first contact portion 412, and the first contact portion 412 is engaged with the positive electrode connecting assembly 2 through the first notch 412a to realize direct contact between the first contact portion 412 and the positive electrode connecting assembly 2.

The second heat conduction pad 42 is the same as the first heat conduction pad 41 in shape, a second notch facing the negative electrode connecting assembly 3 is formed in the side wall of the second contact portion, and the second contact portion is clamped on the negative electrode connecting assembly 3 through the second notch to achieve direct contact between the second contact portion and the negative electrode connecting assembly 3.

By providing the first notch 412a, the first thermal pad 41 can more easily achieve direct contact with the positive electrode connecting assembly 2 when being installed, and meanwhile, the contact manner between the first thermal pad and the positive electrode connecting assembly 2 is more stable; through the second notch, the second heat conduction pad 42 can be more easily in direct contact with the negative electrode connection assembly 3 during installation, and meanwhile, the contact mode of the second heat conduction pad and the negative electrode connection assembly is more stable.

In the first embodiment, as shown in fig. 4, the first thermal pad 41 is provided with a first rib 413 protruding toward the housing 5 on a surface facing away from the battery cell 1. The first rib 413 extends along the bending direction of the first thermal pad 41, that is, two ends of the first rib 413 are aligned with two ends of the first thermal pad 41. The first rib 413 is used for supporting the first thermal pad 41.

The first ribs 413 are arranged in a plurality of rows along the width direction of the first thermal pad 41, and a first side exhaust channel is formed between two adjacent first ribs 413. The gas generated by the battery cell 1 can escape to the explosion-proof valve 62 through the first side exhaust channel, so as to avoid safety accidents.

If the first rib 413 is not provided, the first side exhaust passage cannot be formed; when the battery cell 1 has a long distance along the axial direction of the casing 5, the gas generated by the battery cell 1 cannot escape to the explosion-proof valve 7 in time, so that the explosion-proof valve 7 cannot be exploded in time to release the pressure inside the casing 5, and safety accidents are easy to happen.

The second heat conduction pad 42 has the same shape as the first heat conduction pad 41, a second convex rib protruding towards the housing is arranged on the surface of the second heat conduction pad 42, which is away from the battery cell, the second convex rib extends along the bending direction of the second heat conduction pad, that is, two ends of the second convex rib are aligned with two ends of the second heat conduction pad. The second convex rib is used for supporting the second heat-conducting pad. The second ribs are arranged along the width direction of the second thermal pad 42, and a second side exhaust channel is formed between two adjacent second ribs.

Gas generated by the battery cell 1 covered by the second thermal pad 42 can flow from the second side exhaust passage to the first side exhaust passage to escape to the explosion-proof valve 62.

In other embodiments of the present invention, an explosion-proof valve may also be provided on the second head cover assembly. At this time, gas generated by the battery cell 1 at the position covered by the second thermal pad 42 can directly escape from the second side exhaust period channel to the explosion-proof valve on the second top cover assembly, so as to achieve a better exhaust effect.

In the first embodiment, as shown in fig. 2 to 3, the battery further includes a mylar film 8, and the mylar film 8 wraps the battery core 1 to insulate the battery core 1. The first thermal pad 41 and the second thermal pad 42 are both covered on the outer surface of the mylar film 8.

Referring to fig. 6 and 4, the mylar membrane 8 is provided with a plurality of first vent holes 81. Correspondingly, a plurality of second vent holes 43 are formed on the first thermal pad and the second thermal pad of the thermal pad assembly 4.

Gas generated inside the battery core 1 is exhausted to the first side exhaust channel and the second side exhaust channel through the first exhaust hole 81 in the mylar film 8 and the second exhaust hole 43 in the heat conduction pad assembly 4, so that the gas can escape to the explosion-proof valve 62 to prevent the single battery from exploding.

In addition, it should be noted that although the mylar film 8 is provided with the first exhaust hole 81, since the heat conducting pad assembly 4 is provided with the first protruding rib 413 and the second protruding rib, the thickness of the first protruding rib 413 and the thickness of the second protruding rib are such that a gap is reserved between the mylar film 8 and the inner wall of the housing 5, so that the housing 5 and the battery cell 1 can be ensured to be insulated.

Preferably, the first exhaust holes 81 are staggered with the second exhaust holes 43. Through the staggered arrangement of the first exhaust holes 81 and the second exhaust holes 43, the first exhaust holes 81 can be covered by the heat conducting pad assembly 4, so that the insulating property of the shell 5 is doubly guaranteed.

In the single battery provided by the first embodiment of the present invention, the heat conducting pad assembly is disposed in the casing, the heat conducting pad assembly contacts with the positive electrode connecting assembly or the negative electrode connecting assembly, and the heat conducting pad assembly also contacts with the inner wall of the casing; like this the heat of battery cell in positive coupling assembling or negative pole coupling assembling department can be directly on transmitting the casing through the heat conduction pad subassembly, and need not only can be with heat transfer to the casing through a great deal of other structures again, so that the cooling heat conduction path of battery cell in positive coupling assembling or negative pole coupling assembling department shortens, thereby improves battery cell's radiating efficiency, avoids the heat accumulation to lead to the thermal runaway phenomenon to take place.

Second embodiment

A second embodiment of the present invention provides a single battery, which is different from the first embodiment in that the heat conducting pad assembly is shaped like a frame, the frame of the heat conducting pad assembly is disposed on the outer surface of the battery core, the outer side surface of the heat conducting pad assembly contacts the inner wall of the casing, and the side wall of the heat conducting pad assembly directly contacts the positive electrode connecting assembly or the negative electrode connecting assembly.

Preferably, a first notch which is recessed towards the positive electrode connecting assembly is formed in the heat conducting pad assembly, and the heat conducting pad assembly is clamped on the positive electrode connecting assembly through the first notch so as to realize direct contact of the heat conducting pad assembly and the positive electrode connecting assembly;

be equipped with the orientation on the heat conduction pad subassembly the sunken second breach of negative pole coupling assembling, the heat conduction pad subassembly passes through second breach block is in order to realize on the negative pole coupling assembling the heat conduction pad subassembly with negative pole coupling assembling's direct contact.

In the single battery provided by the second embodiment of the utility model, the heat conducting pad assembly is arranged as a whole of the rectangular frame, and after the heat conducting pad assembly is installed, the heat conducting pad assembly can be simultaneously contacted with the positive electrode connecting assembly and the negative electrode connecting assembly, so that heat at the positive electrode connecting assembly and the negative electrode connecting assembly can be directly transferred to the shell through the heat conducting pad assembly, a cooling heat conduction path of the single battery at the positive electrode connecting assembly and the negative electrode connecting assembly is shortened, the heat dissipation efficiency of the single battery is improved, and the thermal runaway phenomenon caused by heat accumulation is avoided.

Third embodiment

A third embodiment of the present invention provides a battery pack, which includes the single batteries of the above embodiments, wherein a plurality of the single batteries are electrically connected together.

In the battery pack provided by the third embodiment of the utility model, because the single batteries of the above embodiments are adopted, the heat dissipation efficiency of each single battery is improved, the heat dissipation efficiency of the whole battery pack can be greatly improved, and the heat dissipation effect of the battery pack is improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A single battery is characterized by comprising a battery cell, a positive electrode connecting assembly, a negative electrode connecting assembly, a heat conducting pad assembly, a shell and a top cover assembly, wherein the shell is provided with an opening, the top cover assembly is used for sealing the opening of the shell, the battery cell is arranged in the shell, and the battery cell comprises a positive plate, a negative plate and a diaphragm arranged between the positive plate and the negative plate;

2. The single battery according to claim 1, wherein the positive connection assembly comprises a positive tab and a positive connection piece, the positive tab is arranged on one end of the positive plate, and the positive tab is connected with the positive connection piece and connected with the top cover assembly through the positive connection piece; a part of the heat conduction pad assembly extends between the positive electrode lug and the positive electrode connecting sheet, and the heat conduction pad assembly is simultaneously in direct contact with the surface of the positive electrode lug and the surface of the positive electrode connecting sheet;

the negative electrode connecting assembly comprises a negative electrode lug and a negative electrode connecting sheet, the negative electrode lug is arranged on one end of the negative electrode sheet, and the negative electrode lug is connected with the negative electrode connecting sheet and is connected with the top cover assembly through the negative electrode connecting sheet; and one part of the heat conduction pad assembly extends into the space between the negative pole lug and the negative pole connecting sheet, and the heat conduction pad assembly is in direct contact with the surface of the negative pole lug and the surface of the negative pole connecting sheet simultaneously.

3. The cell defined in claim 1, wherein the cap assembly comprises a first cap assembly and a second cap assembly, the housing has two opposing openings, the first cap assembly is configured to seal one of the openings of the housing, and the second cap assembly is configured to seal the other opening of the housing; one end of the positive plate is connected with the first top cover assembly through the positive connecting assembly, and one end of the negative plate is connected with the second top cover assembly through the negative connecting assembly.

4. The battery cell according to claim 3, wherein the heat conducting pad assembly comprises a first heat conducting pad and a second heat conducting pad, the first heat conducting pad comprises two parallel first heat conducting parts and a first contact part connected between the two parallel first heat conducting parts, the first contact part is in direct contact with the positive electrode connecting assembly, the first contact part covers the end face of the battery cell opposite to the first top cover assembly, one of the first heat conducting parts covers the bottom face of the battery cell and is supported by the bottom wall of the casing, and the other first heat conducting part covers the top face of the battery cell and is opposite to the top wall of the casing;

5. The single battery according to claim 4, wherein a first notch recessed toward the positive electrode connecting assembly is formed in a side wall of the first contact portion, and the first contact portion is clamped on the positive electrode connecting assembly through the first notch so as to realize contact between the first contact portion and the positive electrode connecting assembly;

6. The single battery according to claim 5, wherein the first thermal pad is provided with a first rib protruding toward the case on a surface facing away from the battery cell, the first rib extending along a bending direction of the first thermal pad, and the first rib is used for supporting the first thermal pad;

7. The battery cell according to claim 6, further comprising a mylar film wrapping the cell, wherein the first and second thermal pads are covered on an outer surface of the mylar film, and wherein the mylar film is provided with a plurality of first vent holes; and a plurality of second vent holes are formed in the first heat conduction pad and the second heat conduction pad.

8. The single battery according to claim 1, wherein the heat conducting pad assembly is shaped as a frame structure, the heat conducting pad assembly is framed on an outer surface of the battery core, an outer side surface of the heat conducting pad assembly is in contact with an inner wall of the casing, and a side wall of the heat conducting pad assembly is in contact with the positive electrode connecting assembly or the negative electrode connecting assembly.

9. The single battery of claim 8, wherein the heat conducting pad assembly is provided with a first notch recessed towards the positive electrode connecting assembly, and the heat conducting pad assembly is clamped on the positive electrode connecting assembly through the first notch to realize contact between the heat conducting pad assembly and the positive electrode connecting assembly;

10. A battery pack comprising a plurality of the unit batteries according to any one of claims 1 to 9, wherein the plurality of unit batteries are electrically connected together.