Battery shell, battery, battery pack and automobile

Abstract

The utility model relates to a battery shell. The battery shell is provided with a battery cell accommodating cavity; wherein at least one narrow side surface of the battery cell accommodating cavity is provided with a cooling water channel, a first angle is formed between the end surface of the cooling water channel and the narrow side surface of the battery cell accommodating cavity, the end surface of the cooling water channel is provided with a connecting piece, and a second angle is formed between the connecting piece and the end surface of the cooling water channel. The heat management efficiency and the safety of the battery are improved, the structural strength and the space utilization rate of the battery pack are optimized, and important technical support is provided for the development of the new energy automobile battery technology.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery shell, battery, battery pack and car. BACKGROUND

[0002] With the rapid development of new energy industry, the application field of battery becomes more extensive, especially in the automobile industry, the power battery system has become the main power source of electric vehicles. Through the use of power battery system, electric vehicles not only reduce the dependence on non-renewable resources, but also promote the development of environmental protection.

[0003] However, heat will inevitably be generated during the discharge process of the battery. When the battery temperature exceeds its normal working temperature range, it will cause the battery performance to decline, and even may shorten the cycle life of the battery. Therefore, an effective battery thermal management system has become one of the key links in the design of electric vehicles.

[0004] The existing battery cooling technology mainly relies on external liquid cooling plates to realize the cooling of the battery. Although this method can control the temperature of the battery to a certain extent, due to the long heat conduction path, the cooling efficiency is often low. In addition, the design of the liquid cooling plate may cause the cooling effect of the batteries at different positions inside the battery pack to be inconsistent, thereby affecting the performance stability and service life of the entire battery pack.

[0005] Therefore, there is an urgent need for a battery shell, battery, battery pack, and car to improve the problems existing in the prior art and improve the overall performance of the battery system. SUMMARY

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the utility model is:

[0007] The first aspect of the utility model is to provide a battery shell, the battery shell has a battery cell containing cavity; wherein,

[0008] At least one narrow side surface of the battery cell containing cavity is provided with a cooling water channel, the end surface of the cooling water channel and the narrow side surface of the battery cell containing cavity have a first angle, the end surface of the cooling water channel is provided with a connecting piece, the connecting piece and the end surface of the cooling water channel have a second angle.

[0009] Preferably, the cooling water channel is provided on one narrow side surface of the battery cell containing cavity, and the other narrow side surface of the battery cell containing cavity is provided with an explosion-proof valve.

[0010] Preferably, the cooling water channel is provided on both narrow side surfaces of the battery cell containing cavity.

[0011] Preferably, the thickness of the narrow side of the battery cell accommodating cavity provided with the cooling water channel is 0.5mm-2mm, and the thickness of the narrow side of the battery cell accommodating cavity provided with the explosion-proof valve is 0.5mm-1.5mm.

[0012] Preferably, the thickness of the wide side of the battery cell accommodating cavity is 0.3mm-1.5mm.

[0013] Preferably, the thickness of the side of the cooling water channel parallel to the narrow side of the battery cell accommodating cavity is 0.5mm-2mm, and the thickness of the side of the cooling water channel vertical to the narrow side of the battery cell accommodating cavity is 0.5mm-2mm.

[0014] Preferably, the first angle is 0°-80°.

[0015] Preferably, the second angle is 30°-150°.

[0016] Preferably, the cross-sectional shape of the connecting piece is oval, circular, or rectangular.

[0017] The second aspect of the utility model provides a battery, comprising: the battery shell as described above, and the battery cell arranged in the battery cell accommodating cavity of the battery shell.

[0018] The third aspect of the utility model provides a battery pack, comprising: a plurality of batteries as described above arranged side by side.

[0019] The fourth aspect of the utility model provides an automobile, comprising: the battery pack as described above.

[0020] The utility model adopts the above technical scheme, compared with prior art, has the following technical effects:

[0021] The battery shell sets the cooling water channel on the narrow side of the battery cell accommodating cavity, can make the internal pole piece and external pole piece of the battery cell arranged in the battery cell accommodating cavity consistent in cooling trend, ensures that the battery can be kept in the optimum working temperature range under various working conditions, prolongs the service life of the battery, and simultaneously, compared with setting the cooling water channel on the wide side of the battery cell accommodating cavity, the volume proportion of the cooling water channel is reduced, thereby improving the mass / volume energy density of the cooling water channel.

[0022] In the utility model, the first angle is between the end surface of the cooling water channel and the narrow side of the battery cell accommodating cavity, can make the end surface of the cooling water channel adjusted according to demand, avoids the interference of the cover plate welding position simultaneously, thereby improving the welding quality and the space utilization of the battery pack.

[0023] The second angle between the connecting piece and the end face of the cooling water channel can effectively avoid the interference of the cover plate welding position, and further improves the volume / quality energy density of the battery cell.

[0024] To sum up, the utility model discloses not only improve the thermal management efficiency and security of battery, also optimized the structural strength and space utilization of battery pack, provide important technical support for the development of new energy automobile battery technology. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the structural diagram of battery shell in the utility model;

[0026] Figure 2 It is the structural diagram of connecting piece in the utility model;

[0027] Among them, the reference mark includes:

[0028] Battery shell 1;Battery cell accommodating cavity 11;Cooling water channel 12;Connecting piece 121;First angle alpha;Second angle beta. DETAILED DESCRIPTION

[0029] The specific embodiments of the utility model will be described in detail below.

[0030] Unless otherwise defined, the technical terms or scientific terms used in the claims and the specification should be understood as the general meaning of the person skilled in the art in the technical field to which the utility model belongs.

[0031] The "including" or similar words used in the utility model patent application specification and claims mean that the objects appearing before "including" cover the objects appearing after "including" or its equivalent objects, and do not exclude other objects.

[0032] The numerical values mentioned in the utility model include all the values increasing one unit from low to high, and it is assumed that there are at least two units between any lower value and higher value. For example, if a component quantity or a physical quantity is from 1 to 100, 10 to 90 is more optimal, and 20 to 80 is optimal, it is intended to express that the values such as 5 to 95, 14 to 76, 23 to 67, 32 to 58, 41 to 49 are clearly listed in this specification; for the values less than 1, 0.0001, 0.001, 0.01 or 0.1 are considered to be a suitable unit. The foregoing examples are only illustrative, and in fact, all the numerical value combinations between the lowest value and the highest value listed are considered to be clearly listed in the specification in a similar manner.

[0033] Example 1

[0034] AsFigure 1 As shown, the battery shell 1 of the present embodiment is a thin-walled structure with a cell accommodating cavity 11, which has two first end faces (at least one of which is an open structure), two narrow sides, and two wide sides, which are perpendicular to each other;

[0035] A cooling water channel 12 is arranged on the narrow side above the cell accommodating cavity 11 (or the thin-walled structure) in the illustrated direction, which is formed by two second end faces, two first sides parallel to the narrow sides (one of which is the aforementioned narrow side), and two second sides perpendicular to the narrow sides;

[0036] The thickness of the narrow side provided with the cooling water channel 12 is 0.5-2 mm, the thickness of the first side is 0.5-2 mm, the thickness of the second side is 0.5-2 mm, and the first angle a between the second end face and the narrow side is 0-80°, which can adjust the end face of the cooling water channel 12 as needed while avoiding interference with the position of the cover plate welding bead, thereby improving the welding quality and the space utilization of the battery pack;

[0037] As shown, Figure 2 A connecting piece 121 is arranged on the end face of the cooling water channel 12, and the second angle β between the connecting piece 121 and the end face of the cooling water channel 12 is 30-150°, which can effectively avoid interference with the position of the cover plate welding bead, further improving the volume / mass energy density of the cell;

[0038] An explosion-proof valve is arranged on the narrow side below the cell accommodating cavity 11 in the illustrated direction;

[0039] The thickness of the narrow side provided with the explosion-proof valve is 0.5-1.5 mm;

[0040] The thickness of the wide side is 0.3-1.5 mm.

[0041] The battery shell 1 of the present embodiment arranges the cooling water channel 12 on the narrow side of the cell accommodating cavity 11, which can make the internal and external pole pieces of the cell arranged in the cell accommodating cavity 11 receive consistent cooling, ensuring that the battery can maintain an optimal working temperature range under various working conditions and prolonging the service life of the battery;

[0042] At the same time, compared with arranging the cooling water channel 12 on the wide side of the cell accommodating cavity 11, the volume proportion of the cooling water channel 12 is reduced, thereby improving the mass / volume energy density of the cooling water channel 12.

[0043] In a preferred embodiment, the cross-sectional shape of the connecting member 121 is circular.

[0044] Embodiment 2

[0045] The embodiment provides a battery, comprising the battery shell 1 as described in Embodiment 1, and a battery cell arranged in the battery cell accommodating cavity 11.

[0046] Embodiment 3

[0047] The embodiment provides a battery pack, comprising a plurality of batteries as described in Embodiment 2 arranged in sequence and side by side.

[0048] Embodiment 4

[0049] The embodiment provides an automobile, comprising the battery pack as described in Embodiment 3.

[0050] In summary, the utility model not only improves the thermal management efficiency and safety of the battery, but also optimizes the structural strength and space utilization of the battery pack, and provides important technical support for the development of new energy automobile battery technology.

[0051] The above only describes the preferred embodiments of the utility model, and does not limit the implementation and protection scope of the utility model, and those skilled in the art should realize that any equivalent replacement and obvious change obtained by applying the content of the utility model specification and drawings should be included in the protection scope of the utility model.

Claims

1. A battery case characterized by comprising: The battery shell (1) has a cell accommodating cavity (11); wherein, At least one narrow side of the cell accommodating cavity (11) is provided with a cooling water channel (12), an end surface of the cooling water channel (12) and a narrow side of the cell accommodating cavity (11) have a first angle (α), the end surface of the cooling water channel (12) is provided with a connecting piece (121), the connecting piece (121) and the end surface of the cooling water channel (12) have a second angle (β).

2. The battery case according to claim 1, characterized by One narrow side of the cell accommodating cavity (11) is provided with the cooling water channel (12), and the other narrow side of the cell accommodating cavity (11) is provided with an explosion-proof valve.

3. The battery case according to claim 2, characterized by Both narrow sides of the cell accommodating cavity (11) are provided with the cooling water channel (12).

4. The battery case according to claim 2 or 3, characterized by The thickness of the narrow side of the cell accommodating cavity (11) provided with the cooling water channel (12) is 0.5mm-2mm, and the thickness of the narrow side of the cell accommodating cavity (11) provided with the explosion-proof valve is 0.5mm-1.5mm.

5. The battery case of claim 1, wherein, The thickness of the wide side of the cell accommodating cavity (11) is 0.3mm-1.5mm.

6. The battery case of claim 1, wherein, The thickness of the side of the cooling water channel (12) arranged in parallel with the narrow side of the cell accommodating cavity (11) is 0.5mm-2mm, and the thickness of the side of the cooling water channel (12) arranged perpendicularly to the narrow side of the cell accommodating cavity (11) is 0.5mm-2mm.

7. The battery case of claim 1, wherein, The first angle (α) is 0°-80°.

8. The battery case of claim 1, wherein, The second angle (β) is 30°-150°.

9. The battery case of claim 1, wherein, The cross-sectional shape of the connecting piece (121) is oval, circular, or rectangular.

10. A battery, characterized by It comprises: The battery shell (1) according to any one of claims 1-9, and a cell arranged in the cell accommodating cavity (11) of the battery shell (1).

11. A battery pack, characterized by It comprises: A plurality of batteries according to claim 10 arranged in sequence and side by side.

12. An automobile characterized by comprising: It comprises: The battery pack according to claim 11.

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