Lithium battery testing device adopting composite cooling mode

Abstract

The utility model discloses a lithium battery testing device adopting a composite cooling mode, which comprises at least one testing part, the testing part comprises a testing cylinder and an upper cover which is detachably connected with the testing cylinder, and the testing cylinder and the upper cover form a testing cavity for accommodating a lithium battery; a first cooling water channel is arranged on the inner wall of the testing cylinder, and a first water inlet pipe and a first water outlet pipe which are communicated with the first cooling water channel are arranged on the testing cylinder; the upper cover is internally provided with a second cooling water channel, and the upper cover is provided with a second water inlet pipe and a second water outlet pipe which are communicated with the second cooling water channel, the cooling water channels are arranged in the test cylinder and the upper cover, so that the battery can be comprehensively cooled in a mode of combining side cooling and top cooling, the cooling effect is improved, and the test efficiency is improved. And when the temperature of the battery cell is too high, the battery is cooled, so that the battery is maintained in a normal working temperature range, and the generation of lithium precipitation in a rapid charging period and the generation of side reactions in a discharging process are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery testing tooling, in particular to a lithium battery testing device with a composite cooling method. Background Art

[0002] As the energy density of power batteries continues to increase and their costs continue to decrease, the range of electric vehicles is also increasing. Electric vehicles launched this year generally have a range exceeding 400km, and some mid-to-high-end models have a range of over 500km, basically meeting daily commuting needs. Therefore, charging speed has become a major obstacle to the promotion and application of new energy vehicles. Shortening charging time can better enhance the user experience of electric vehicles and is of great significance to the promotion of electric vehicles.

[0003] The development of fast-charging lithium-ion batteries can be broadly categorized into four main areas: developing new electrolytes, electrode materials, charging protocols, or heating strategies. Heating strategies have the potential to enable fast charging of electric vehicles in the near term. However, as temperature increases, the rate of side reactions rapidly increases, degrading overall performance and service life. Furthermore, adding an additional heater to the battery is incompatible with existing battery manufacturing processes and may raise safety concerns.

[0004] While increasing charging speeds can shorten charging times, excessively high charging speeds can also accelerate battery degradation, impacting the lifespan of electric vehicles. During fast charging, internal resistance generates significant heat (battery surface temperatures can exceed 45°C), but effective methods for uniformly dissipating heat from the battery are currently lacking. Localized overheating can exacerbate battery aging and lead to safety issues. Therefore, during battery development, and especially during battery testing, a test fixture that can rapidly control battery temperature is urgently needed. Utility Model Content

[0005] The purpose of the present invention is to provide a lithium battery testing device with a composite cooling method to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A lithium battery testing device with a composite cooling method includes at least one testing portion, wherein the testing portion includes a testing cylinder and a detachably connected upper cover, wherein the testing cylinder and the upper cover form a testing cavity for accommodating a lithium battery;

[0008] The inner wall of the test cylinder is provided with a first cooling water channel, and the test cylinder is provided with a first water inlet pipe and a first water outlet pipe communicating with the first cooling water channel;

[0009] A second cooling water channel is provided in the upper cover, and a second water inlet pipe and a second water outlet pipe communicating with the second cooling water channel are provided on the upper cover.

[0010] As a further solution of the present invention: the test cylinder is a cylinder with an open end, the test cavity is a placement cavity arranged in the cylinder, and the upper cover is detachably connected to the opening of the placement cavity.

[0011] As a further solution of the present invention: a plurality of connecting threaded holes are provided at the position where the test cylinder is connected to the upper cover, and corresponding positions of the upper cover are provided with connecting holes, and the upper cover and the test cylinder are fixedly connected by bolts.

[0012] As a further solution of the present invention: the first water inlet pipe and the first water outlet pipe are located at the upper end of the test cylinder, and the first water inlet pipe and the first water outlet pipe are located on both sides of the test cylinder. The upper cover is provided with a first avoidance hole for avoiding the first water inlet pipe and the first water outlet pipe, and the first water inlet pipe and the first water outlet pipe extend to the top of the upper cover through the first avoidance hole.

[0013] As a further solution of the present invention: the upper cover includes an upper cover body, and the second water inlet pipe and the second water outlet pipe are located on both sides of the upper cover body.

[0014] As a further solution of the present invention: a second avoidance hole is provided on the upper cover body, the tab of the lithium battery is connected with a test connection line, and the test connection line passes through the second avoidance hole and extends to the top of the upper cover.

[0015] As a further solution of the present invention: the tabs of the lithium battery include a negative tab and a positive tab, the test connection line includes a first test connection line and a second test connection line, the first test connection line and the second test connection line are connected to the negative tab and the positive tab through a nickel sheet, and the other ends of the first test connection line and the second test connection line are connected to a charge and discharge test device.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. This application provides cooling water channels in the test tube and the upper cover, thereby comprehensively cooling the battery through a combination of side cooling and top cooling, thereby improving the cooling effect. When the battery cell temperature is too high, the battery is cooled to maintain the battery within the normal operating temperature range, thereby reducing the generation of lithium plating during fast charging and the occurrence of side reactions during discharge.

[0018] 2. The upper cover of the test cylinder of the present application can be disassembled and assembled, and can be selectively installed as needed during actual application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the test device of this embodiment;

[0020] Figure 2 This is a schematic diagram of the test tube structure of this embodiment;

[0021] Figure 3 、 Figure 4 This is a schematic diagram of the lithium battery structure of this embodiment;

[0022] Figure 5 、 Figure 6 This is a schematic diagram of the upper cover structure of this embodiment.

[0023] In the picture:

[0024] 1-test cylinder, 11-cylinder body, 12-connecting threaded hole, 13-placement cavity, 14-first water inlet pipe, 15-first water outlet pipe;

[0025] 2-upper cover, 21-cover plate body, 22-second water inlet pipe, 23-second water outlet pipe, 24-connecting hole, 25-first avoidance hole, 26-second avoidance hole;

[0026] 3-lithium battery, 31-first test connection line, 32-second test connection line, 33-negative electrode tab, 34-positive electrode tab. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] See also Figure 1-6 In an embodiment of the present invention, a lithium battery testing device with a composite cooling method includes at least one testing unit. When a single battery test is required, only one testing unit is required. When a battery module is tested, multiple testing units can be combined into a module for testing.

[0029] The testing unit includes a test barrel 1 and a detachably connected upper cover 2. The test barrel 1 and upper cover 2 form a test cavity for accommodating a lithium battery 3. In this embodiment, the test barrel 1 is a cylindrical body 11 with an open end. The test cavity is a placement chamber 13 arranged within the cylindrical body 11. The upper cover 2 is detachably connected to the opening of the placement chamber 13. A plurality of threaded holes 12 are provided at the connection between the test barrel 1 and the upper cover 2. Connecting holes 24 are provided at corresponding locations on the upper cover 2. The upper cover 2 and the test barrel 1 are fixedly connected by bolts.

[0030] A first cooling water channel is provided on the inner wall of the test cylinder 1. A first water inlet pipe 14 and a first water outlet pipe 15 communicating with the first cooling water channel are provided on the test cylinder 1. The first water inlet pipe 14 and the first water outlet pipe 15 are located at the upper end of the test cylinder 1, and the first water inlet pipe 14 and the first water outlet pipe 15 are located on both sides of the test cylinder 1. A first avoidance hole 25 for avoiding the first water inlet pipe 14 and the first water outlet pipe 15 is provided on the upper cover 2. The first water inlet pipe 14 and the first water outlet pipe 15 extend to the top of the upper cover 2 through the first avoidance hole 25. The upper cover 2 includes an upper cover body 21. A second cooling water channel is provided in the upper cover body 21. A second water inlet pipe 22 and a second water outlet pipe 23 communicating with the second cooling water channel are provided on the upper cover 2. The second water inlet pipe 22 and the second water outlet pipe 23 are located on both sides of the upper cover body 21.

[0031] A second avoidance hole 26 is provided on the upper cover body 21. The pole ear of the lithium battery 3 is connected to a test connection line, and the test connection line extends to the top of the upper cover 2 through the second avoidance hole 26. The pole ear of the lithium battery includes a negative pole ear 33 and a positive pole ear 34. The test connection line includes a first test connection line 31 and a second test connection line 32. The first test connection line 31 and the second test connection line 32 are connected to the negative pole ear 33 and the positive pole ear 34 through the nickel sheet. The other end of the first test connection line 31 and the second test connection line 32 is connected to the charge and discharge test device.

[0032] When the present invention is in use, the negative electrode tab 33 and the positive electrode tab 34 of the lithium battery 3 are first connected to the first test connection line 31 and the second test connection line 32, and then the first test connection line 31 and the second test connection line 32 are passed through the second avoidance hole 26 on the upper cover body 21. Then, the lithium battery 3 is placed in the placement cavity 13 in the test cylinder 1, and the upper cover 2 is moved onto the test cylinder 1. The fastening bolts are passed through the connection holes 24 and the connection threaded holes 12 to thread the upper cover 2 and the test cylinder 1. After the connection is completed, the first water inlet pipe 14 and the first water outlet pipe 15 of the test cylinder 1 are connected to the circulating cooling water source, and the second water inlet pipe 22 and the second water outlet pipe 23 on the upper cover 2 are connected to the circulating cooling water source to complete the preparation work. Finally, the first test connection line 31 and the second test connection line 32 are connected to the charge and discharge test device to perform charge and discharge tests on the lithium battery. At the same time, the test cylinder 1 and the upper cover 2 can be used to cool the sides, bottom and top of the lithium battery 3 in all directions to ensure that the lithium battery is within a suitable temperature range.

[0033] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0034] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A lithium battery testing device with a composite cooling method, characterized in that: The device comprises at least one testing portion, the testing portion comprising a testing cylinder (1) and a detachably connected upper cover (2), the testing cylinder (1) and the upper cover (2) forming a testing cavity for accommodating a lithium battery (3); A first cooling water channel is provided on the inner wall of the test cylinder (1), and a first water inlet pipe (14) and a first water outlet pipe (15) communicating with the first cooling water channel are provided on the test cylinder (1); A second cooling water channel is provided in the upper cover (2), and a second water inlet pipe (22) and a second water outlet pipe (23) communicating with the second cooling water channel are provided on the upper cover (2).

2. The lithium battery testing device with a composite cooling method according to claim 1, characterized in that: The test cylinder (1) is a cylinder (11) with an open end, the test cavity is a placement cavity (13) arranged in the cylinder (11), and the upper cover (2) is detachably connected to the opening of the placement cavity (13).

3. The lithium battery testing device with a composite cooling method according to claim 1, characterized in that: A plurality of connection threaded holes (12) are provided at the position where the test cylinder (1) and the upper cover (2) are connected, and a connection hole (24) is provided at a corresponding position of the upper cover (2). The upper cover (2) and the test cylinder (1) are fixedly connected by bolts.

4. The lithium battery testing device with a composite cooling method according to claim 1, characterized in that: The first water inlet pipe (14) and the first water outlet pipe (15) are located at the upper end of the test cylinder (1), and the first water inlet pipe (14) and the first water outlet pipe (15) are located on both sides of the test cylinder (1). The upper cover (2) is provided with a first avoidance hole (25) for avoiding the first water inlet pipe (14) and the first water outlet pipe (15). The first water inlet pipe (14) and the first water outlet pipe (15) pass through the first avoidance hole (25) and extend to the top of the upper cover (2).

5. The lithium battery testing device with a composite cooling method according to claim 1, characterized in that: The upper cover (2) comprises an upper cover body (21), and the second water inlet pipe (22) and the second water outlet pipe (23) are located on both sides of the upper cover body (21).

6. A lithium battery testing device with a composite cooling method according to claim (5), characterized in that: A second avoidance hole (26) is provided on the upper cover body (21); the tab of the lithium battery (3) is connected to a test connection line, and the test connection line passes through the second avoidance hole (26) and extends to the top of the upper cover (2).

7. The lithium battery testing device with a composite cooling method according to claim 1, characterized in that: The tabs of the lithium battery include a negative tab (33) and a positive tab (34); the test connection line includes a first test connection line (31) and a second test connection line (32); the first test connection line (31) and the second test connection line (32) are connected to the negative tab (33) and the positive tab (34) through a nickel sheet; the other ends of the first test connection line (31) and the second test connection line (32) are connected to a charge and discharge test device.

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