Battery monomer and battery pack

Abstract

The utility model relates to the technical field of new energy batteries, and discloses a single battery and a battery pack, the single battery comprises a shell, the shell comprises a coaming and a bottom plate, the coaming and the bottom plate define an assembly space, and the bottom plate is provided with an assembly hole; the bottom supporting plate is arranged in the assembly space, the assembly space is divided into an assembly cavity and an exhaust cavity by the bottom supporting plate, and the exhaust cavity is communicated with the assembly hole; the electrode assembly is assembled in the assembling cavity, the bottom supporting plate comprises a plate body and a supporting table, and the orthographic projection of the supporting table on the bottom plate in the first direction and the assembling hole are arranged in a staggered mode; the bottom supporting plate is further provided with an exhaust groove, the exhaust groove penetrates through the plate body and the supporting table in the first direction, and a through groove is formed in the side, away from the electrode assembly, of the supporting table and communicates with the exhaust groove and the exhaust cavity. And the gas in the assembly space can flow to the exhaust cavity from the exhaust grooves staggered with the assembly holes, and flows to the anti-explosion valves at the assembly holes through the exhaust cavity, so that the safety of the single batteries is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy battery technical field especially relates to a battery monomer and battery package. BACKGROUND

[0002] At present, the application of power battery is more and more extensive in the market, and the power battery is not only applied to energy storage power supply systems such as hydraulic, thermal, wind and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and military equipment and aerospace and other fields.

[0003] The battery package is powered by a plurality of battery monomers connected in series and parallel to the power equipment, and the safety of each battery monomer is crucial to the stable operation of the battery package, so the safety of the battery is more and more valued, and the battery monomer with the bottom valve exhaust design can effectively improve the safety performance. Under the above background, the battery monomer is provided with an explosion-proof valve at the bottom, when the battery monomer triggers heat runaway, the high temperature and high pressure material in the battery monomer is discharged through the explosion-proof valve, ensuring the safety of the battery monomer.

[0004] However, when the exhaust passage between the electrode assembly and the explosion-proof valve in the battery monomer is blocked, the battery monomer cannot trigger the opening of the explosion-proof valve in time, affecting the safety of the battery monomer. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a battery monomer to solve the problem that the battery monomer in the prior art cannot open the explosion-proof valve in time when the exhaust passage between the electrode assembly and the explosion-proof valve is blocked, and also provides a battery package using the battery monomer.

[0006] In order to achieve the above purpose, the utility model provides a battery monomer, the battery monomer has first direction, second direction and third direction that intersect with each other, and the battery monomer comprises:

[0007] The shell comprises a coaming and a bottom plate, the coaming and the bottom plate form an assembly space, and the bottom plate has an assembly hole for assembling an explosion-proof valve;

[0008] The bottom support plate is arranged in the assembly space, along the second direction, the bottom support plate divides the assembly space into an assembly cavity and an exhaust cavity, the exhaust cavity is located between the bottom support plate and the bottom plate, and the exhaust cavity is communicated with the assembly hole;

[0009] The electrode assembly is arranged in the assembly cavity, and the electrode assembly is supported on the bottom support plate;

[0010] The bottom supporting plate comprises a plate body and a supporting table connected with the plate body, the supporting table is arranged on a side of the plate body away from the electrode assembly along the first direction, a normal projection of the supporting table on the bottom plate along the first direction is arranged staggeredly with the assembly hole, and the supporting table is supported on the bottom plate; the bottom supporting plate further has an exhaust groove, and the exhaust groove penetrates through the plate body and the supporting table along the first direction, the side of the supporting table away from the electrode assembly is further provided with a through groove, and the through groove communicates the exhaust groove and the exhaust cavity along the third direction.

[0011] Preferably, the supporting table and the exhaust groove both extend along the second direction, and the through groove penetrates through the supporting table along the third direction.

[0012] Preferably, a plurality of through grooves are arranged, and each through groove is distributed at intervals along the second direction.

[0013] Preferably, the plate body is further provided with exhaust holes penetrating through the plate body along the first direction, a plurality of exhaust holes, exhaust grooves and supporting tables are arranged, the supporting tables are arranged correspondingly with the exhaust grooves, and the exhaust grooves and the exhaust holes are arranged alternately along the third direction.

[0014] Preferably, the plate body is further provided with a groove, a groove bottom of the groove is connected with the plate body, and a weak part is arranged at a position where the groove bottom is connected with the plate body.

[0015] Preferably, a ring groove is arranged at the position where the groove bottom is connected with the plate body, and the ring groove forms the weak part.

[0016] Preferably, the plate body further has a through groove penetrating through the plate body along the first direction, and the through groove at least partially overlaps with the assembly hole along the first direction.

[0017] Preferably, the through groove and the exhaust groove are arranged at intervals along the third direction.

[0018] Preferably, the through groove has at least one of an I-shaped structure, an X-shaped structure and a curved structure.

[0019] The utility model further provides a battery pack which comprises the battery monomer of any one of the above technical solutions.

[0020] The utility model discloses a battery monomer and battery pack compared with prior art, its beneficial effect lies in: the bottom support plate of battery monomer and the bottom plate between the casing are provided with the exhaust cavity that communicates with the assembly hole on the bottom plate, and the exhaust groove and support platform that are arranged staggered with the assembly hole are provided on the bottom support plate, the exhaust groove penetrates the support platform on the bottom support plate and communicates with the exhaust cavity through the through groove, when battery monomer thermal runaway, the gas in assembly cavity can enter the exhaust cavity from the exhaust groove that is arranged staggered with the assembly hole through the through groove, and flow to the explosion -proof valve at the assembly hole through the exhaust cavity, finally is discharged by explosion -proof valve, has promoted the security of battery monomer, avoids the blast risk. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the structural schematic diagram of battery monomer of the utility model;

[0022] Figure 2 It is Figure 1 The sectional view of battery monomer of

[0023] Figure 3 It is Figure 2 The enlarged structure schematic diagram of A of battery monomer of

[0024] Figure 4 It is the structural schematic diagram of bottom support plate of battery monomer of the utility model;

[0025] Figure 5 It is Figure 4 The structural schematic diagram of another view of bottom support plate of

[0026] Figure 6 It is Figure 5 The structural enlarged diagram of B of bottom support plate of

[0027] Figure 7 It is the structural schematic diagram of bottom support plate of battery monomer of the utility model when setting recess;

[0028] Figure 8 It is Figure 7 The structural schematic diagram of another wall of bottom support plate of

[0029] Figure 9 It is the structural sectional view of battery monomer of using Figure 7 Bottom support plate of

[0030] Figure 10 It is Figure 9 The structural enlarged diagram of C of bottom support plate of

[0031] Figure 11 It is the structural schematic diagram of bottom support plate of battery monomer of the utility model when the through groove is X-shaped on the bottom support plate;

[0032] Figure 12This is a schematic diagram of the structure of the bottom support plate of the battery cell of this utility model when the through groove is curved.

[0033] In the figure, 1 is the shell, 11 is the enclosure, 12 is the bottom plate, 13 is the assembly hole, 14 is the assembly space, 15 is the assembly cavity, 2 is the electrode assembly, 3 is the bottom support plate, 31 is the plate body, 311 is the through groove, 33 is the support platform, 34 is the through groove, 4 is the exhaust chamber, 51 is the exhaust hole, 52 is the exhaust groove, 53 is the groove, 6 is the weak part, 61 is the annular groove, 7 is the explosion-proof valve, Z is the first direction, Y is the second direction, and X is the third direction. Detailed Implementation

[0034] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0035] A preferred embodiment of a battery cell of this utility model is as follows: Figures 1 to 12 As shown, the battery cell includes a housing 1, an electrode assembly 2, and a base plate 3. Both the electrode assembly 2 and the base plate 3 are disposed within the housing 1, and the housing 1 protects the internal electrode assembly 2. The battery cell has three intersecting directions: a first direction Z, a second direction Y, and a third direction X. In this embodiment, the first direction Z is the height direction of the battery cell, the second direction Y is the thickness direction of the battery cell, and the third direction X is the width direction of the battery cell.

[0036] The housing 1 includes a surrounding plate 11 and a bottom plate 12. The surrounding plate 11 has a rectangular structure, and its bottom end is fixedly connected to the bottom plate 12. The surrounding plate 11 and the bottom plate 12 form an assembly space 14. The bottom plate 12 also has an assembly hole 13 for assembling the explosion-proof valve 7. In this embodiment, the assembly hole 13 is located at the center of the bottom plate 12. Under normal conditions, after the battery cell undergoes thermal runaway, the gas in the assembly space 14 is discharged through the explosion-proof valve.

[0037] The base plate 3 is disposed within the assembly space 14, dividing the assembly space 14 into an assembly cavity 15 and an exhaust cavity 4. The electrode assembly 2 is disposed within the assembly cavity 15 and supported on the base plate 3. The exhaust cavity 4 is located between the base plate 3 and the base plate 12. The exhaust cavity 4 communicates with the assembly hole 13 on the base plate 12, allowing gas in the exhaust cavity 4 to be discharged through the explosion-proof valve at the assembly hole 13.

[0038] The base plate 3 includes a plate body 31 and a support platform 33 connected to the plate body 31. The support platform 33 is located on the side of the plate body 31 away from the electrode assembly 2 along the first direction Z. The orthographic projection of the support platform 33 along the first direction Z on the base plate 12 is staggered from the mounting hole 13, that is, the orthographic projection of the support platform 33 along the first direction Z on the base plate 12 does not overlap with the mounting hole 13.

[0039] As Figure 3 , Figure 5 With Figure 6 shown, the support table 33 is supported on the bottom plate 12, and the support table 33 has a gap between the bottom wall of the plate body 31 and the bottom plate 12, which increases the space of the exhaust cavity 4 and improves the exhaust efficiency of the gas, and simplifies the formation structure of the exhaust cavity 4 and the assembly form of the bottom support plate 3. In this embodiment, the plate body 31 and the support table 33 are integrally formed.

[0040] The bottom support plate 3 also has exhaust grooves 52, which are provided in multiple numbers and penetrate the plate body 31 and the support table 33 along the first direction Z. The side of the support table 33 away from the electrode assembly 2 is also provided with a through groove 34, which communicates the exhaust grooves 52 and the exhaust cavity 4 along the third direction X, so that each exhaust groove 52 is in communication with the exhaust cavity 4, and the gas can enter the exhaust cavity 4 from any one of the exhaust grooves 52 on the bottom support plate 3 through the through groove 34, so that the gas can be quickly exhausted, reducing the pressure in the shell 1 of the battery monomer. Because the support table 33 is arranged staggered with the assembly hole 13, when the channel in the battery monomer in communication with the explosion-proof valve is blocked, the gas in the assembly cavity 15 enters the exhaust groove 52 staggered with the assembly hole 13, and can be exhausted from any one of the exhaust grooves 52.

[0041] As Figure 3 , Figure 4 With Figure 5 shown, the exhaust grooves 52 penetrate the support table 33 along the first direction Z, and the cross-sectional area of the exhaust grooves 52 is large, which can increase the exhaust efficiency. The exhaust grooves 52 penetrate the support table 33, that is, the exhaust grooves 52 on the plate body 31 are arranged at the position of the support table 33, and the orthogonal projection of the exhaust grooves 52 on the bottom plate 12 is arranged staggered with the assembly hole 13. The support table 33 can structureally reinforce the position of the plate body 31 with the exhaust grooves 52, and bear the weight of the electrode assembly 2.

[0042] The battery monomer is provided with the exhaust cavity 4 in communication with the assembly hole 13 on the bottom plate 12 between the bottom support plate 3 and the bottom plate 12 of the shell 1, and the exhaust grooves 52 and the support table 33 are arranged staggered with the assembly hole 13 on the bottom support plate 3. When the battery monomer is in thermal runaway, the gas in the assembly cavity 15 can enter the exhaust cavity 4 from the exhaust grooves 52 staggered with the assembly hole 13 through the through groove 34. Because there are multiple exhaust grooves 52, the gas can flow from each exhaust groove 52 to the exhaust cavity 4, and then flow to the explosion-proof valve at the assembly hole 13 through the exhaust cavity 4, and finally be exhausted by the explosion-proof valve, improving the safety of the battery monomer and avoiding the risk of explosion.

[0043] Preferably, the support table 33 and the exhaust grooves 52 extend along the second direction Y, and the through groove 34 penetrates the support table 33 along the third direction X.

[0044] The through groove 34 extends along the third direction X and penetrates the support platform 33, the direction of the through groove 34 is perpendicular to the direction of the support platform 33, the length of the through groove 34 is reduced, the gas exhaust efficiency is accelerated, the pressure in the shell 1 is quickly reduced, and the risk of explosion of the top cover of the battery monomer is avoided.

[0045] Preferably, the through groove 34 has a plurality of through grooves 34, and each through groove 34 is spaced apart along the second direction Y.

[0046] The through groove 34 is spaced apart along the second direction Y, and the exhaust groove 52 is directly communicated with the through groove 34 at multiple positions in the second direction Y, which facilitates the rapid exhaust of the gas generated during thermal runaway.

[0047] Preferably, the plate body 31 is further provided with an exhaust hole 51, the exhaust hole 51 penetrates the plate body 31 along the first direction Z, the exhaust hole 51, the exhaust groove 52 and the support platform 33 are provided with a plurality of exhaust holes 51, the support platform 33 is provided in one-to-one correspondence with the exhaust groove 52, and the exhaust groove 52 and the exhaust hole 51 are alternately arranged along the third direction X.

[0048] As shown in Figure 3 , Figure 4 and Figure 5 , the exhaust hole 51 is in a normally open state, and when the battery monomer is in thermal runaway, the gas can directly enter the exhaust cavity 4 through the exhaust hole 51, and the pressure in the battery monomer is quickly reduced. In this embodiment, the exhaust holes 51 are arranged in an array on the plate body 31, so that the gas can flow into the exhaust cavity 4 from any one of the exhaust holes 51. Specifically, the hole wall shape of the exhaust hole 51 can be set as a tapered shape, a horn shape, etc., so that the gas hole is a variable-diameter hole, and the exhaust efficiency is increased.

[0049] Each exhaust groove 52 and the exhaust hole 51 are alternately arranged along the third direction X, so that the exhaust at each region of the plate body 31 is relatively uniform, and when part of the channel in the battery monomer is blocked, the gas caused by thermal runaway can flow from the exhaust groove 52 and the exhaust hole 51 at any region of the plate body 31 to the exhaust cavity 4.

[0050] Preferably, the plate body 31 is further provided with a groove 53, the groove bottom of the groove 53 is connected to the side of the plate body 31 facing the bottom plate 12, and the position where the groove bottom of the groove 53 is connected to the plate body 31 is further provided with a weak part 6.

[0051] As shown in Figures 7 to 10 , the weak part 6 can be damaged by high-pressure gas generated when the battery monomer is in thermal runaway, so that the groove 53 is communicated with the exhaust cavity 4. When the battery monomer is not in thermal runaway, the groove 53 is in a closed state; when the battery monomer is in thermal runaway, the weak part 6 is damaged by high-pressure gas, the bottom wall is blown open by the gas, the groove 53 is communicated with the exhaust cavity 4 and the assembly space 14, and the gas generated during thermal runaway can be quickly exhausted.

[0052] Preferably, the groove 53 is provided with an annular groove 61 at the position where the groove bottom is connected with the plate body 31, and the annular groove 61 forms a weak portion 6.

[0053] The annular groove 61 is a portion with reduced thickness on the bottom wall of the groove 53, and the weak portion 6 can be formed by simple processing, which simplifies the structure of the weak portion 6.

[0054] Preferably, the plate body 31 further has a through groove 311 penetrating through the plate body 31 along the first direction Z, and the through groove 311 at least partially overlaps the assembly hole 13 along the first direction Z.

[0055] When the battery cell is in thermal runaway, the through groove 311 can be opened by high-temperature and high-pressure gas, and since the through groove 311 partially overlaps the assembly hole 13, the gas can be directly discharged from the explosion-proof valve 7 at the assembly hole 13.

[0056] Preferably, the through groove 311 is arranged in the third direction X away from the exhaust groove 52, and the through groove has an H-shaped structure.

[0057] The width of the through groove is small, and the plate body 31 at the through groove can be opened like a door when the battery cell is in thermal runaway. Figure 11 As shown in FIG. 6, the through groove 311 can also have an X-shaped structure. Figure 12 As shown in FIG. 7, the through groove 311 can also have a curved structure.

[0058] The utility model also provides a preferred embodiment of a battery pack, which comprises a battery cell, and the specific structure of the battery cell is the same as that in any of the above technical solutions, which is not repeated here.

[0059] In summary, the utility model embodiment provides a battery cell and a battery pack, which are provided with an exhaust cavity communicating with an assembly hole on a bottom plate between a bottom supporting plate of the battery cell and a bottom plate of a shell, and are further provided with an exhaust groove and a supporting table arranged away from the assembly hole on the bottom supporting plate, the exhaust groove penetrates through the supporting table on the bottom supporting plate and communicates with the exhaust cavity through a through groove.

[0060] The above merely is the preferred implementation form of the present application, and it should be noted that, for the ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, and these improvements and substitutions should also be considered as the protection scope of the present application.

Claims

1. A battery cell, characterized by, The battery cell has a first direction, a second direction and a third direction intersecting with each other, and comprises: a shell comprising a surrounding plate and a bottom plate, the surrounding plate and the bottom plate enclosing an assembling space, the bottom plate having an assembling hole for assembling an explosion-proof valve; a bottom supporting plate arranged in the assembling space, the bottom supporting plate dividing the assembling space into an assembling cavity and an exhaust cavity along the second direction, the exhaust cavity being located between the bottom supporting plate and the bottom plate, and the exhaust cavity being in communication with the assembling hole; an electrode assembly arranged in the assembling cavity, the electrode assembly being supported on the bottom supporting plate; the bottom supporting plate comprises a plate body and a supporting table connected with the plate body, the supporting table being arranged on a side of the plate body away from the electrode assembly along the first direction, a normal projection of the supporting table on the bottom plate along the first direction being arranged staggered with the assembling hole, and the supporting table being supported on the bottom plate; the bottom supporting plate further has an exhaust groove penetrating through the plate body and the supporting table along the first direction, and a through groove being further arranged on the side of the supporting table away from the electrode assembly, the through groove being in communication with the exhaust groove and the exhaust cavity along the third direction.

2. The battery cell of claim 1, wherein, The supporting table and the exhaust groove both extend along the second direction, and the through groove penetrates through the supporting table along the third direction.

3. The battery cell of claim 2, wherein, A plurality of through grooves are arranged, and each through groove is distributed spaced apart along the second direction.

4. The battery cell of claim 1, wherein, The plate body further has an exhaust hole penetrating through the plate body along the first direction, a plurality of exhaust grooves, a plurality of supporting tables and a plurality of exhaust holes are arranged, the supporting table and the exhaust groove are arranged one by one, and the exhaust groove and the exhaust hole are arranged alternately along the third direction.

5. The battery cell of claim 1, wherein, The plate body further has a recess, a groove bottom of the recess being connected with the plate body, and a weak part being further arranged at a position where the groove bottom of the recess is connected with the plate body.

6. The battery cell of claim 5, wherein, The position where the groove bottom of the recess is connected with the plate body is provided with a ring groove, and the ring groove forms the weak part.

7. The battery cell of any one of claims 1-6, wherein, The plate body further has a through groove penetrating through the plate body along the first direction, and the through groove at least partially overlaps with the assembling hole along the first direction.

8. The battery cell of claim 7, wherein, The through groove and the exhaust groove are arranged spaced apart along the third direction.

9. The battery cell of claim 7, wherein, The through groove has at least one of an I-shaped structure, an X-shaped structure and a curved structure.

10. A battery pack, characterized by, The battery cell comprises any one of claims 1-9.

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