Battery cell and battery pack thereof

Abstract

The utility model relates to a battery cell and a battery pack. The battery cell comprises a cell body, the protruding part is formed in the center of the top face of the core body and protrudes upwards out of the top face of the core body; the two pole connecting areas are symmetrically arranged by taking the center line of the protruding part as the axis; the side surface of the protruding part and the top surface of the core body are encircled to form the pole connecting area; the pole column is mounted in the pole column connecting area; the first mounting position is used for mounting a liquid cooling plate, and the first mounting position is formed on the top surface of the protruding part; and the second mounting position is used for mounting a liquid cooling plate, and the second mounting position is formed on the bottom surface of the core body. The problems that the heat dissipation efficiency of the battery cell is not high and the installation is not simple and convenient are solved.

Description

Technical Field

[0001] The present application relates to the field of battery cell technology, and in particular to a battery cell and a battery pack thereof. Background Art

[0002] As the power storage part of the battery pack, the battery cell will generate a lot of heat during its operation, so the battery cell needs to be cooled. Traditionally, a liquid cooling plate is set at the bottom to remove the heat. However, in this way, when the temperature of the battery cell is high, the bottom area of ​​the battery cell is small, and the liquid cooling plate cannot dissipate heat quickly. In this way, it is difficult to ensure the overall temperature balance of the battery cell, which makes the battery cell temperature uneven and affects the accuracy of the battery cell temperature sampling. Secondly, the installation of the liquid cooling plate is not easy. Utility Model Content

[0003] Based on this, it is necessary to provide a battery cell and a battery pack that can improve heat dissipation efficiency and is easy to install.

[0004] A battery cell, comprising:

[0005] A core body, wherein along a height direction of the core body, the core body has a top surface and a bottom surface that are arranged opposite to each other;

[0006] A protrusion is located on the top surface of the core body and protrudes from the top surface of the core body along the height direction of the core body; and along the length direction of the core body, each side surface of the protrusion and the top surface respectively form a pole connection area;

[0007] A pole, installed in the pole connection area;

[0008] A first mounting position is formed on a surface of the protruding portion away from the top surface in a height direction of the core body and is used for mounting a first liquid cooling plate;

[0009] The second installation position is formed on the bottom surface of the core body and is used for installing a second liquid cooling plate.

[0010] In one of the embodiments, in the height direction of the core, the height of the pole is lower than the height of the protrusion.

[0011] In one embodiment, the battery cell also includes a connector, which is arranged at the first installation position; a side of the connector close to the protrusion is fixedly connected to the protrusion, and a side of the connector away from the protrusion is used to be fixedly connected to the first liquid cooling plate.

[0012] The present application also provides a battery pack, including multiple groups of battery modules, a first liquid cooling plate, and a second liquid cooling plate; the battery module is composed of multiple battery cells described in any of the above embodiments.

[0013] In one embodiment, the plurality of battery cells are arranged and connected along the width direction of the battery cells; the first liquid cooling plate is installed at the first installation position, and the second liquid cooling plate is installed at the second installation position.

[0014] In one embodiment, the first liquid cooling plate is provided in plurality, and the plurality of the first liquid cooling plates are distributed in one-to-one correspondence with the plurality of the battery modules.

[0015] In one embodiment, the second liquid cooling plate is provided as one, and a plurality of the battery modules are evenly spaced and arranged on the one second liquid cooling plate.

[0016] In one of the embodiments, the second liquid cooling plate has a plurality of liquid cooling channels and a plurality of positioning structures, the plurality of liquid cooling channels are distributed in a one-to-one correspondence with the plurality of battery modules, and the plurality of positioning structures are distributed alternately with the plurality of liquid cooling channels.

[0017] In one embodiment, the second liquid cooling plate includes a first plate body and a second plate body fixedly connected to the first plate body;

[0018] The positioning structure includes a plurality of protrusions, through holes and openings provided on the protrusions. The plurality of protrusions are formed on a side of the first plate body close to the second plate body. The opening is formed on the second plate body, and the opening is provided corresponding to the protrusions.

[0019] In one embodiment, the positioning structure further includes a protrusion, which is formed on a side of the second plate body away from the first plate body, and the protrusion is provided with an opening.

[0020] Compared with the prior art, the battery cell and its battery pack provided by the present application can meet the requirement of respectively setting liquid cooling at the top and bottom of the battery cell for heat dissipation, and the heat exchange area of ​​the battery cell is increased, which greatly improves the heat exchange efficiency of the battery cell. At the same time, by performing heat exchange at the top and bottom of the battery cell, the temperature of the upper and lower parts of the battery cell is uniform, the temperature balance of the single battery cell is ensured, the overall temperature consistency of the battery cell is improved, and the accuracy of the battery cell temperature sampling is guaranteed. Secondly, the setting of the protrusion creates a height difference between the installation position of the first liquid cooling plate and the pole, leaving space for the installation of the pole and other accessories, avoiding the difficulty of installing the battery cell after adding a liquid cooling plate on the top, and the battery cell is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 This is a schematic diagram of the battery cell structure provided in this application.

[0023] Figure 2 A front view of the battery cell provided for this application.

[0024] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0025] Figure 4 A top view of the battery cell provided in this application.

[0026] Figure 5 Schematic diagram of the battery pack structure provided for this application.

[0027] Figure 6 A front view of the battery pack provided for this application.

[0028] Figure 7 for Figure 6 Enlarged view of point B in the middle.

[0029] Figure 8 This is a schematic diagram of the bottom-up structure of the second liquid cooling plate provided in the present application.

[0030] Figure numerals: 100, battery cell; 110, core body; 120, protrusion; 130, pole connection area; 140, pole; 150, first mounting position; 151, connector; 160, second mounting position; 200, battery module; 300, first liquid cooling plate; 400, second liquid cooling plate; 410, first plate body; 420, second plate body; 430, liquid cooling channel; 440, positioning structure; 441, protrusion; 442, through hole; 443, opening; 444, protrusion; 445, opening. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0032] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0036] See also Figures 1 to 4The present application provides a battery cell, comprising a core body 110, a protrusion 120, a pole connection area 130, a pole 140, a first mounting position 150 and a second mounting position 160. The core body 110 has a top surface 1101 and a bottom surface 1102 disposed opposite to each other along the height direction z of the core body 110. The protrusion 120 is located on the top surface 1101 of the core body 110 and protrudes from the top surface 1101 of the core body 110 along the height direction z of the core body 110. And along the length direction x of the core body 110, each side surface of the protrusion 120 and the top surface 1101 respectively form a pole connection area 130. The pole 140 is installed in the pole connection area 130. The first mounting position 150 is formed on the surface of the protrusion 120 away from the top surface 1101 along the height direction z of the core body 110, and is used to install the first liquid cooling plate 300. The second mounting position 160 is formed on the bottom surface 1102 of the core body 110 and is used to install the second liquid cooling plate 400. In this way, by setting the first mounting position 150 and the second mounting position 160, liquid cooling plates can be installed on the top and bottom of the battery cell for heat dissipation, the heat exchange area of ​​the battery cell is increased, and the heat exchange efficiency of the battery cell is greatly improved. By exchanging heat at the top and bottom of the battery cell, the temperature of the upper and lower parts of the battery cell is uniform, the temperature balance of the single battery cell is ensured, the overall temperature consistency of the battery cell is improved, and the accuracy of the battery cell temperature sampling is guaranteed. In addition, a height difference is formed between the protrusion 120 and the pole 140, which leaves space for the connection of the pole 140 and other accessories, avoiding the difficulty of installing the battery cell after adding a top liquid cooling plate, and the battery cell is easy to install.

[0037] In one embodiment, the material of the protrusion 120 is the same as that of the core 110, and the protrusion 120 and the core 110 are integrally formed. Of course, in other embodiments, the protrusion 120 can also be fixedly connected to the top surface of the core 110 by welding or other methods.

[0038] Furthermore, two pole connection areas 130 are provided, and the two pole connection areas 130 are symmetrically arranged with the center line of the protrusion 120 as the axis. The length of the protrusion 120 is set to be less than the length of the top surface 1101 of the core body 110, and because the protrusion 120 is protruding from the core body 110, a gap will appear at both ends of the protrusion 120 in the length direction x, respectively. The gap is formed by the side of the protrusion 120 and the top surface of the core body 110, that is, the pole connection area 130.

[0039] Accordingly, two poles 140 are provided, the two being a positive pole and a negative pole, and the two poles 140 are respectively provided in two pole connection areas 130. In this embodiment, the bottom surface of the pole 140 is fixedly connected to the top surface 1101 of the core 110 by welding, and the pole 140 after installation is located in the pole connection area 130.

[0040] Preferably, the height of the pole 140 is set to be lower than the height of the protrusion 120 .

[0041] In this embodiment, the first mounting position 150 is the top surface of the protrusion 120. Of course, in other embodiments, a groove or a convex rib or other structure may be provided on the top surface of the protrusion 120, and together with the top surface, it constitutes the first mounting position 150. The second mounting position 160 is formed on the bottom surface of the battery cell, that is, the bottom surface of the battery cell is the second mounting position 160. Of course, in other embodiments, a groove or a convex rib or other structure may be provided on the bottom surface of the battery cell, and together with the bottom surface, it constitutes the second mounting position 160.

[0042] like Figure 1 and Figure 4 As shown, the battery cell further includes a connector 151, which is disposed on the first mounting position 150, and the first mounting position 150 realizes the installation of the liquid cooling plate through the connector 151. Specifically, the side of the connector 151 close to the protrusion 120 is fixedly connected to the protrusion 120, and the side away from the protrusion 120 is used for fixed connection with the first liquid cooling plate 300.

[0043] Specifically, the connector 151 is a sheet structure, and the connector 151 is a heat-conducting structural adhesive, so that the temperature of the core 110 can be better transferred to the liquid cooling plate. The fixed connection between the above-mentioned connector 151 and the protrusion 120 and the first liquid cooling plate 300 is achieved by the bonding of the structural adhesive itself. However, it is not limited to this. In other embodiments, the connector 151 can be a metal sheet made of other metals with good thermal conductivity, as long as the thermal conductivity requirements are met. In this way, the fixed connection between the above-mentioned connector 151 and the protrusion 120 and the first liquid cooling plate 300 is achieved by welding.

[0044] Likewise, a connector 151 may also be provided on the second installation position 160 , and the second installation position 160 realizes installation of the second liquid cooling plate 400 through the connector 151 . The structure and arrangement of the connector 151 are the same as those described above.

[0045] See also Figures 1 to 8 , the present application also includes a battery pack, which includes multiple groups of battery modules 200, a first liquid cooling plate 300, and a second liquid cooling plate 400; wherein each battery module 200 is composed of multiple battery cells 100 of any one of the above embodiments. Multiple battery cells 100 are arranged and connected along the width direction y of the battery cell 100 itself to form a battery module 200. Here, only two groups of battery modules 200 are drawn in the figure, but it is not limited to two groups. The specific number of groups can also be three groups, four groups, four groups or more, etc., according to actual needs. The first liquid cooling plate 300 is installed in the first mounting position 150, and the second liquid cooling plate 400 is installed in the second mounting position 160. The specific installation method is gluing or direct welding.

[0046] In this way, liquid cooling plates are installed on the top and bottom of the battery module 200 for heat dissipation, and the heat exchange area of ​​the battery cell 100 is increased, which greatly improves the heat exchange efficiency of the battery cell 100. By exchanging heat at the top and bottom of the battery cell 100, the temperature of the upper and lower parts of the battery cell 100 is uniform, ensuring the temperature balance of the single battery cell 100, improving the overall temperature consistency of the battery cell 100, and ensuring the accuracy of the temperature sampling of the battery cell 100.

[0047] In one embodiment, a plurality of first liquid cooling plates 300 are provided, and the number of first liquid cooling plates 300 corresponds to the number of battery modules 200, and the plurality of first liquid cooling plates 300 are distributed one-to-one with the plurality of battery modules 200, that is, a first liquid cooling plate 300 is installed on each battery module 200. The width of the first liquid cooling plate 300 is equal to the width of the protrusion 441, so that the liquid cooling plate will not cover the installation area of ​​the pole 140 after installation, so that the pole 140 is exposed. Of course, in other embodiments, the width of the first liquid cooling plate 300 can also be set to be slightly smaller than the width of the protrusion 441, as long as it does not affect the heat exchange efficiency.

[0048] In one embodiment, the second liquid cooling plate 400 is provided as one, and multiple battery modules 200 are evenly arranged on the second liquid cooling plate 400, with gaps between adjacent battery modules 200. The second liquid cooling plate 400 does not need to consider the pole 140, and can be directly provided as a single one, which is simpler to produce and assemble.

[0049] Furthermore, a plurality of liquid cooling channels 430 and a plurality of positioning structures 440 are arranged on the second liquid cooling plate 400, and the plurality of positioning structures 440 are staggered and distributed with the plurality of liquid cooling channels 430 at intervals, and the second liquid cooling plate 400 can be connected to other accessories through the positioning structure 440. The position of the liquid cooling channel 430 corresponds to the position of the battery module 200, and the liquid cooling channel 430 is distributed one-to-one with the battery module 200, that is, the position corresponding to the battery module 200 on the lower cold liquid plate is provided with a liquid cooling channel 430. In the present embodiment, three liquid cooling channels 430 are arranged corresponding to each group of battery modules 200. The liquid cooling channel 430 is a long channel, through which liquid can pass, so as to better perform heat exchange treatment on the battery cell 100.

[0050] In one embodiment, the second liquid cooling plate 400 includes a first plate body 410 and a second plate body 420, which are welded and fixedly connected to each other. In the height direction z, the upper layer is the first plate body 410, and the lower layer is the second plate body 420. The first plate body 410 is fixedly connected to the bottom of the battery module 200, and the second plate body 420 is fixedly connected to the first plate body 410.

[0051] Specifically, the positioning structure 440 includes a protrusion 441, a through hole 442 and an opening 443. The protrusion 441 is provided in plurality, and the specific number is not limited here. The protrusion 441 is a circular protrusion 441 protruding from the first plate 410, formed on the side of the first plate 410 close to the second plate 420, and the through hole 442 is a hole or a screw hole provided at the center point of the protrusion 441, which can be connected to the through hole 442 by a bolt or a screw. The opening 443 is a circular opening 443 on the second plate 420, and the opening 443 is formed on the second plate 420, and the opening 443 is provided corresponding to the protrusion 441, and the protrusion 441 extends out of the second plate 420 through the opening 443.

[0052] In one embodiment, the positioning structure 440 further includes a protrusion 444, a circular protrusion 441 or a square protrusion 441 protruding from the first plate body 410, and the protrusion 444 is formed on a side of the second plate body 420 away from the first plate body 410. The protrusion 444 is provided with an opening 445, which is a smooth circular hole or a screw hole, and can be connected to the opening 445 by a bolt or a screw.

[0053] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A battery cell, characterized in that: include: A core body (110), wherein along a height direction of the core body (110), the core body (110) has a top surface (1101) and a bottom surface (1102) disposed opposite to each other; A protruding portion (120) is located on the top surface (1101) of the core (110) and protrudes from the top surface (1101) of the core (110) along the height direction of the core (110); and along the length direction of the core (110), each side surface of the protruding portion (120) and the top surface (1101) respectively form a pole connection area (130); A pole (140) installed in the pole connection area (130); A first mounting position (150) is formed on a surface of the protruding portion (120) away from the top surface (1101) in a height direction of the core (110), and is used for mounting a first liquid cooling plate (300); A second mounting position (160) is formed on the bottom surface (1102) of the core (110) and is used for mounting a second liquid cooling plate (400).

2. The battery cell according to claim 1, characterized in that: In the height direction of the core (110), the height of the pole (140) is lower than the height of the protruding portion (120).

3. The battery cell according to claim 1, characterized in that: The battery cell further comprises a connecting piece (151), wherein the connecting piece (151) is arranged on the first installation position (150); a side of the connecting piece (151) close to the protruding portion (120) is fixedly connected to the protruding portion (120), and a side of the connecting piece (151) away from the protruding portion (120) is used for being fixedly connected to the first liquid cooling plate (300).

4. A battery pack, characterized in that: It comprises a plurality of battery modules (200), a first liquid cooling plate (300), and a second liquid cooling plate (400); the battery module (200) is composed of a plurality of battery cells (100) as claimed in any one of claims 1 to 3.

5. The battery pack according to claim 4, characterized in that: The plurality of battery cells (100) are arranged and connected along the width direction of the battery cells (100); the first liquid cooling plate (300) is installed at the first installation position (150), and the second liquid cooling plate (400) is installed at the second installation position (160).

6. The battery pack according to claim 4, characterized in that: The first liquid cooling plate (300) is provided in plurality, and the plurality of first liquid cooling plates (300) are distributed in a one-to-one correspondence with the plurality of battery modules (200).

7. The battery pack according to claim 4, characterized in that: The second liquid cooling plate (400) is provided as one, and a plurality of the battery modules (200) are evenly spaced and arranged on the one second liquid cooling plate (400).

8. The battery pack according to claim 7, characterized in that: The second liquid cooling plate (400) is provided with a plurality of liquid cooling channels (430) and a plurality of positioning structures (440), the plurality of liquid cooling channels (430) being distributed in a one-to-one correspondence with the plurality of battery modules (200), and the plurality of positioning structures (440) being distributed in an alternating manner with the plurality of liquid cooling channels (430).

9. The battery pack according to claim 8, characterized in that: The second liquid cooling plate (400) comprises a first plate body (410) and a second plate body (420) fixedly connected to the first plate body (410); The positioning structure (440) includes a plurality of protrusions (441), through holes (442) and openings (443) provided on the protrusions (441); the plurality of protrusions (441) are formed on a side of the first plate body (410) close to the second plate body (420); the opening (443) is formed on the second plate body (420); and the opening (443) is arranged corresponding to the protrusions (441).

10. The battery pack according to claim 9, characterized in that: The positioning structure (440) further comprises a protrusion (444), wherein the protrusion (444) is formed on a side of the second plate body (420) away from the first plate body (410), and an opening (445) is provided on the protrusion (444).

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