Soft package battery test tool

Abstract

The utility model discloses a soft package battery testing tool which comprises a pressurizing body used for being stacked with a tested soft package battery, the pressurizing body comprises at least two silica gel layers separated by a fiber interlayer, and the stacking direction of the fiber interlayer and the silica gel layers is parallel to the stacking direction of the pressurizing body and the soft package battery. Wherein one silica gel layer provides an outer surface, in contact with the soft package battery, of the pressurizing body. The soft package battery test tool of the utility model can better adapt to the working condition of large test pressure.

Description

Technical Field

[0001] The utility model relates to the technical field of battery testing, in particular to a soft-pack battery testing tool. Background Art

[0002] All-solid-state batteries are a new generation of power sources composed of solid electrolytes instead of liquid electrolytes. Due to the characteristics of the solid-solid contact interface of the electrodes of all-solid-state batteries, external pressure is usually applied in the form of soft-pack batteries to test performance. The traditional soft-pack battery test fixture only sets a silicone pad between the metal plate and the soft-pack battery. The force of the pressure-applying equipment (such as a tablet press) is applied to the metal plate and transmitted to the soft-pack battery through the silicone pad. The disadvantage of this soft-pack battery test fixture is that when the required test pressure is large, such as when testing large-capacity batteries, the Poisson wave of the silicone pad is large, which will cause the silicone pad to deform severely, and then cause the tested soft-pack battery to crack, uneven force, and battery test short circuit. Therefore, how to improve the soft-pack battery test fixture to meet the needs of larger test pressure has become a technical problem that needs to be solved urgently by technicians in this field. Utility Model Content

[0003] In view of this, the purpose of the present utility model is to provide a soft-pack battery testing tool to better adapt to working conditions with higher testing pressure.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A soft-pack battery testing tool comprises a pressurized body stacked with a soft-pack battery to be tested, the pressurized body comprising at least two silicone layers separated by a fiber interlayer, the stacking direction of the fiber interlayer and the silicone layer is parallel to the stacking direction of the pressurized body and the soft-pack battery, and one of the silicone layers provides an outer surface of the pressurized body in contact with the soft-pack battery.

[0006] Optionally, in the above-mentioned soft-pack battery testing tool, the thickness of the single silicone layer is 0.3 mm to 1 mm.

[0007] Optionally, in the above-mentioned soft-pack battery testing tool, the number of the silicone layers is 2 to 6.

[0008] Optionally, in the above-mentioned soft-pack battery testing tool, the single fiber interlayer is a single-layer structure or a multi-layer structure along the stacking direction.

[0009] Optionally, in the above-mentioned soft-pack battery test fixture, the fiber interlayer of the single-layer structure is any one of a glass fiber layer, a Kevlar fiber layer, a carbon fiber layer, an aromatic polyamide fiber layer and a ceramic fiber layer.

[0010] Optionally, in the above-mentioned pouch cell testing tooling, the fiber interlayer of the multi-layer structure is formed by laminating at least two of a glass fiber layer, a Kevlar fiber layer, a carbon fiber layer, an aramid fiber layer, and a ceramic fiber layer.

[0011] Optionally, in the above-mentioned pouch cell testing tooling, the pressing body includes a metal plate for bearing the acting force of the pressing device, and the metal plate provides the outer surface of the pressing body on the side away from the pouch cell.

[0012] Optionally, in the above-mentioned pouch cell testing tooling, the metal plate is connected to the silica gel layer farthest from the pouch cell through a transition interlayer, and the transition interlayer is a three-layer structure along the lamination direction, which are the first layer connected to the metal plate, the second layer connected to the silica gel layer, and the intermediate layer located between the first layer and the second layer;

[0013] The first layer and / or the second layer are set as a fiberglass cloth layer, an aramid fiber layer, a high-temperature paper layer, a release paper layer, a polytetrafluoroethylene layer, or an aramid meltblown cloth layer, and the intermediate layer is set as a high-molecular elastic material layer.

[0014] Optionally, in the above-mentioned pouch cell testing tooling, the thickness of the first layer is 0.15 mm to 0.4 mm, the thickness of the second layer is 0.15 mm to 0.4 mm, and the thickness of the intermediate layer is 1 mm to 10 mm.

[0015] Optionally, in the above-mentioned pouch cell testing tooling, the metal plate is a steel plate with a thickness of 8 mm to 25 mm.

[0016] The pouch cell testing tooling provided by the present utility model has the following beneficial effects:

[0017] During use, the pressing body and the pouch cell are stacked, and the pressing body transmits the required test pressure to the pouch cell. Since the adjacent silica gel layers are connected through a fiber interlayer, this part of the heating body composed of the silica gel layer and the fiber interlayer is not easily extended under high pressure compared with a silica gel pad made of pure silica gel of the same thickness, and can play a role in balancing the pressure, which is beneficial to avoiding problems such as cracking, uneven stress, and short circuit in battery testing of the pouch cell under the condition of relatively large test pressure. Therefore, the pouch cell testing tooling provided by the present utility model can well adapt to the working condition of relatively large test pressure and meet the requirements for testing large-capacity batteries (such as all-solid-state batteries). Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0019] Figure 1 is a three-dimensional schematic diagram of the soft-pack battery test tooling provided by the embodiment of the present invention;

[0020] Figure 2 is a front view of the soft-pack battery test tooling provided by the embodiment of the present invention;

[0021] Figure 3 is the corresponding Figure 2 cross-sectional view of the soft-pack battery test tooling provided by Embodiment 1 of the present invention at A;

[0022] Figure 4 is the corresponding Figure 2 cross-sectional view of the soft-pack battery test tooling provided by Embodiment 2 of the present invention at A.

[0023] The labels in the figure are:

[0024] 1, bolt; 2, soft-pack battery; 300, pressurizing body; 301, silicone layer; 302, fiber interlayer; 303, metal plate; 310, transition interlayer; 311, first layer; 312, intermediate layer; 313, second layer. Detailed implementation manners

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0026] See Figures 1 to 4An embodiment of the utility model provides a soft-pack battery testing tool, including a pressurized body 300 stacked with a soft-pack battery 2 to be tested, the pressurized body 300 includes at least two silicone layers 301 separated by a fiber interlayer 302, and the stacking direction of the fiber interlayer 302 and the silicone layer 301 is parallel to the stacking direction of the pressurized body 300 and the soft-pack battery 2, wherein one of the silicone layers 301 provides an outer surface of the pressurized body 300 in contact with the soft-pack battery 2. When the soft-pack battery 2 is subjected to a pressure test, the pressurizing body 300 is in direct contact with the soft-pack battery 2, and the external pressure is transmitted to the soft-pack battery 2 through the pressurizing body 300. The pressure direction is parallel to the above-mentioned stacking direction. Since the adjacent silicone layers 301 are connected by the fiber interlayer 302, the part of the heating body composed of the silicone layer 301 and the fiber interlayer 302 is not easy to stretch under high pressure compared to a silicone pad of the same thickness made of silicone alone, and can play a role in balancing the pressure, which is beneficial to avoid cracking, uneven force and battery test short circuit problems of the soft-pack battery 2 under conditions of high test pressure. Therefore, the soft-pack battery test tooling provided by the utility model can well adapt to conditions of high test pressure and meet the requirements for testing large-capacity batteries (such as all-solid-state batteries).

[0027] Two adjacent silicone layers 301 are separated by a fiber interlayer 302, so the number of silicone layers 301 is one more than the number of fiber interlayers 302. Figure 3 In the exemplary embodiment, the number of silicone layers 301 is 4, and the number of fiber interlayers 302 is 3. Of course, the number of silicone layers 301 can be set to other values. The number of silicone layers 301 is generally set to 2 to 6. The thickness of these silicone layers 301 can be equal or unequal. The thickness of a single silicone layer 301 can be set to 0.3 mm to 1 mm, such as 0.5 mm, 0.6 mm, and 0.8 mm. The thickness between two adjacent silicone layers 301, that is, the thickness of a single fiber interlayer 302 can be set to 0.1 mm to 0.8 mm, such as 0.15 mm, 0.3 mm, 0.4 mm, 0.5 mm, and 0.6 mm. In general, the thickness of the fiber interlayer 302 is set to be smaller than the thickness of the two silicone layers 301 separated by it.

[0028] The fiber interlayer 302 is made of a fiber material. A single fiber interlayer 302 can be arranged as a single-layer structure or a multi-layer structure along the above-mentioned stacking direction. Moreover, when the number of silicone layers 301 is more than two, the fiber interlayers 302 at different positions can be the same or different. If the fiber interlayer 302 is arranged as a single-layer structure, the fiber interlayer 302 can be any one of a glass fiber layer, a Kevlar fiber layer, a carbon fiber layer, an aramid fiber layer, and a ceramic fiber layer. If the fiber interlayer 302 is arranged as a multi-layer structure along the above-mentioned stacking direction, the fiber interlayer 302 can be formed by laminating at least two of a glass fiber layer, a Kevlar fiber layer, a carbon fiber layer, an aramid fiber layer, and a ceramic fiber layer. For example, the fiber interlayer 302 is a two-layer structure including a glass fiber layer and a carbon fiber layer arranged in a laminated manner. Another example is that the fiber interlayer 302 is a three-layer structure including a glass fiber layer, a carbon fiber layer, and a ceramic fiber layer arranged in a laminated manner in sequence.

[0029] In some embodiments, the pressing body 300 may include a metal plate 303 for bearing the acting force of the pressing device. The metal plate 303 provides the outer surface of the pressing body 300 on the side away from the soft-pack battery 2. In this way, when using the pressing body 300, there is no need to be equipped with an additional rigid plate, and the pressure of the pressing device can be directly borne by the metal plate 303 of the pressing body 300. The metal plate 303 can be set as a steel plate with a thickness of 8 mm to 25 mm (for example, 15 mm). In this way, it is not easy to deform under a relatively large pressure (for example, a pressure of 10 tons), which is beneficial for the soft-pack battery 2 to be tested to obtain a more uniform acting force. In order to better play the role of the metal plate 303 in evenly transmitting the pressure, the flatness of the surface of the metal plate 303 is generally set within the range of 10 μm to 40 μm. When the metal plate 303 is a steel plate, its material is preferably die steel.

[0030] As Figure 2 and Figure 3 shown, in some embodiments, the metal plate 303 can be directly connected to the silicone layer 301 farthest from the soft-pack battery 2. As Figure 2 and Figure 4As shown, in some other embodiments, the metal plate 303 can be connected to the silicone layer 301 farthest from the soft-pack battery 2 through a transition interlayer 310. The transition interlayer 310 is a three-layer structure along the above-mentioned stacking direction, namely the first layer 311 connected to the metal plate 303, the second layer 313 connected to the silicone layer 301, and the intermediate layer 312 located between the first layer 311 and the second layer 313. The first layer 311 and / or the second layer 313 are set as a fiberglass cloth layer, an aramid fiber layer, a high-temperature paper layer, a release paper layer, a polytetrafluoroethylene layer or an aramid meltblown cloth layer, and the intermediate layer 312 is set as a polymer elastic material layer. The first layer 311 and the second layer 313 can be the same or different. For example, both the first layer 311 and the second layer 313 are set as high-temperature paper layers. Another example is that the first layer 311 is set as a release paper layer and the second layer 313 is set as an aramid meltblown cloth layer.

[0031] It should be noted that each layer structure of the transition interlayer 310 is made of known materials, and the polymer elastic material layer is an elastic layer structure made of known polymer materials. The transition interlayer 310 is set as a three-layer structure, with the characteristics of being softer in the middle and harder on both sides, and not easily bendable. It can play a role in balanced transition during the process of pressure transmission from the metal plate 303 to the silicone layer 301, so that the force on the middle and edge of the soft-pack battery 2 is more uniform. The transition interlayer 310 and the metal plate 303 and the silicone layer 301 can be connected into one body by, for example, bonding. In the three-layer structure of the transition interlayer 310, the thickness of the first layer 311 can be set to 0.15 mm to 0.4 mm, the thickness of the second layer 313 can be set to 0.15 mm to 0.4 mm, and the thickness of the intermediate layer 312 can be set to 1 mm to 10 mm. For example, the thicknesses of both the first layer 311 and the second layer 313 are set to 0.3 mm, and the thickness of the intermediate layer 312 is set to 1.5 mm.

[0032] See Figure 1 and Figure 2 , the pressurizing bodies 300 are generally used in pairs, located on both sides of the soft-pack battery 2 respectively, and sandwich the soft-pack battery 2 in the middle to apply pressure. The pressurizing bodies 300 can be provided with mounting holes for installing the bolts 1 at the edge positions, and the two pressurizing bodies 300 are assembled through the bolts 1. For example, the pressurizing body 300 includes a rectangular metal plate 303, and mounting holes are provided at the four corner positions of the metal plate 303, and the two pressurizing bodies 300 are assembled through four bolts 1.

[0033] In this specification, the various embodiments are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0034] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather should be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A soft-pack battery testing tooling, characterized in that Comprising a pressing body for being stacked with the pouch cell to be tested, the pressing body includes at least two silica gel layers separated by a fiber interlayer, and the stacking direction of the fiber interlayer and the silica gel layers is parallel to the stacking direction of the pressing body and the pouch cell, and one of the silica gel layers provides the outer surface of the pressing body in contact with the pouch cell.

2. The soft-pack battery testing tooling according to claim 1, wherein The thickness of a single silica gel layer is 0.3 mm to 1 mm.

3. The soft-pack battery testing tooling according to claim 1, characterized in that The number of the silica gel layers is 2 to 6.

4. The soft-pack battery testing tooling according to claim 1, wherein A single fiber interlayer is a single-layer structure or a multi-layer structure along the stacking direction.

5. The soft-pack battery testing tooling according to claim 4, characterized in that, The single-layer fiber interlayer is any one of a glass fiber layer, a Kevlar fiber layer, a carbon fiber layer, an aramid fiber layer, and a ceramic fiber layer.

6. The soft-pack battery testing tooling according to claim 4, wherein The multi-layer fiber interlayer is formed by stacking at least two of a glass fiber layer, a Kevlar fiber layer, a carbon fiber layer, an aramid fiber layer, and a ceramic fiber layer.

7. The soft-pack battery testing tooling according to any one of claims 1 to 6, characterized in that The pressing body includes a metal plate for bearing the acting force of the pressing device, and the metal plate provides the outer surface of the pressing body on the side away from the pouch cell.

8. The soft-pack battery testing tooling according to claim 7, wherein The metal plate is connected to the silica gel layer farthest from the pouch cell through a transition interlayer, and the transition interlayer is a three-layer structure along the stacking direction, which are a first layer connected to the metal plate, a second layer connected to the silica gel layer, and an intermediate layer located between the first layer and the second layer; The first layer and / or the second layer is set as a fiberglass cloth layer, an aramid fiber layer, a high-temperature paper layer, a release paper layer, a polytetrafluoroethylene layer or an aramid meltblown cloth layer, and the intermediate layer is set as a polymer elastic material layer.

9. The soft-pack battery testing tooling according to claim 8, wherein The thickness of the first layer is 0.15 mm to 0.4 mm, the thickness of the second layer is 0.15 mm to 0.4 mm, and the thickness of the intermediate layer is 1 mm to 10 mm.

10. The soft-pack battery testing tooling according to claim 8, characterized in that, The metal plate is a steel plate with a thickness of 8 mm to 25 mm.

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